Articles de revues : « METALLURGICAL INVESTIGATION »

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Reitz, W. « Metallurgical investigation into an automotive fire ». Journal of Failure Analysis and Prevention 6, n^o 2 (avril 2006) : 20–23. http://dx.doi.org/10.1361/154770206x99280.

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Bhaumik, S. K., T. A. Bhaskaran, R. Rangaraju, M. A. Venkataswamy, M. A. Parameswara et R. V. Krishnan. « Metallurgical investigation of defective superalloy rings ». Engineering Failure Analysis 11, n^o 3 (juin 2004) : 449–62. http://dx.doi.org/10.1016/j.engfailanal.2003.05.019.

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Xiaolei, Xu, et Yu Zhiwei. « Metallurgical investigation on cracked plunger-sleeves ». Engineering Failure Analysis 16, n^o 5 (juillet 2009) : 1740–48. http://dx.doi.org/10.1016/j.engfailanal.2009.01.001.

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Szumiata, Tadeusz, Marzena Rachwał, Tadeusz Magiera, Katarzyna Brzózka, Małgorzata Gzik-Szumiata, Michał Gawroński, Bogumił Górka et Joanna Kyzioł-Komosińska. « Iron-containing phases in metallurgical and coke dusts as well as in bog iron ore ». Nukleonika 62, n^o 2 (27 juin 2017) : 187–95. http://dx.doi.org/10.1515/nuka-2017-0029.

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Abstract Several samples of dusts from steel and coke plants (collected mostly with electro filters) were subjected to the investigation of content of mineral phases in their particles. Additionally, sample of bog iron ore and metallurgical slurry was studied. Next, the magnetic susceptibility of all the samples was determined, and investigations of iron-containing phases were performed using transmission Mössbauer spectrometry. The values of mass-specific magnetic susceptibility χ varied in a wide range: from 59 to above 7000 × 10−8 m-3·kg−1. The low values are determined for bog iron ore, metallurgical slurry, and coke dusts. The extremely high χ was obtained for metallurgical dusts. The Mössbauer spectra and X-ray diffraction patterns point to the presence of the following phases containing iron: hematite and oxidized magnetite (in coke and metallurgical dusts as well as metallurgical slurry), traces of magnetite fine grains fraction (in metallurgical dusts), amorphous glassy silicates with paramagnetic Fe3+ and Fe2+ ions, traces of pyrrhotite (in coke dusts), α-Fe and nonstoichiometric wüstite (in metallurgical slurry), as well as ferrihydrite nanoparticles (in bog iron ore). For individual samples of metallurgical dusts, the relative contributions of Fe2+/3+ ions in octahedral B sites and Fe2+ ions in tetrahedral A sites in magnetite spinel structure differs considerably.

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Zivkovic, D., N. Strbac, J. Lamut, B. Andjelic, M. Cocic, M. Steharnik et A. Mitovski. « Investigation of archaeometallurgical findings from Felix Romuliana locality ». Journal of Mining and Metallurgy, Section B : Metallurgy 45, n^o 2 (2009) : 207–12. http://dx.doi.org/10.2298/jmmb0902207z.

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Remains of metallurgical activities have been discovered recently at the locality Felix Romuliana near Zajecar (Eastern Serbia), with a lot of slag occurrences and metal findings. Samples, taken from this locality, have been investigated using different characterization methods - chemical analysis, XRD and SEM-EDX, in order to clarify the Early Byzantine metallurgical activities at Felix Romuliana.

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Neidel, A., E. Cagliyan et B. Fischer. « Metallurgical Failure Investigation of Fractured Spring Seals ». Practical Metallography 58, n^o 8 (1 août 2021) : 539–49. http://dx.doi.org/10.1515/pm-2021-0041.

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Abstract Elastic sealing elements used in combustion chamber assemblies of heavy-duty gas turbine engines used for power generation fractured from high cycle fatigue failure. The subject assembly was burner rig tested in a special testing facility. It was speculated that the affected spring seals likely failed due to forced excitation during burner rig testing, since no material imperfections or fabrication flaws, such as spot weld imperfections, were detected that could have contributed to the failure.

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Vasiltsov, V. S., et M. S. Nysh. « EXPLICATION OF THE INVESTMENT POLICY ESSENCE BY THE CASE OF METALLURGICAL SECTOR COMPLEX ». Bulletin of Udmurt University. Series Economics and Law 31, n^o 2 (20 avril 2021) : 204–14. http://dx.doi.org/10.35634/2412-9593-2021-31-2-204-214.

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The article analyzes multiple definitions of enterprise investment policy. It reveals the scientists’ judgments on the essence of the enterprise investment policy and presents the term definitions integrated with the scientific approach, applying semantic-syntactic criteria in the ontological analysis methodology. In terms of the scientific approaches, suggested by the authors, the objectives of the industrial enterprise investment policy, methods for evaluating the investment policy in general, and the capital investment projects specifically are considered. The authors outline the main problematic issues that require further in-depth research. Differences in the objectives of the investment policy between the enterprises inside the branch, as well as factors of influence on institutional conditions of investment into the metallurgical industry are identified based on the analysis of the strategic profile of the national metallurgical companies and analytical data of the World Steel Association. The authors give the essential criteria of the investment activity efficiency in the field, among which are: fluctuation in world metal prices; the national currency exchange rate volatility; vertical integration in metallurgic enterprise management; oligopoly in the domestic metallurgical market. Approaches, proposed by the authors, are relevant both methodologically and practically, and encourage to further investigation of the enterprise investment policy and investment activity specifics in the metallurgical industry sector.

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Bondarenko, N., et A. Nesterova. « Investigation of the development status and provision with fixed assets of the metallurgical industry of Ukraine ». Galic'kij ekonomičnij visnik 70, n^o 3 (2021) : 178–87. http://dx.doi.org/10.33108/galicianvisnyk_tntu2021.03.178.

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The metallurgical industry is important for Ukraine in strategic perspective, primarily for the development of economic situation of the country, the social sphere, as well as the issue of national security of Ukraine. The metallurgical industry generates more than 30% of GDP, and 40% of foreign exchange earnings in the economy are provided by this industry. However, under modern conditions, domestic metallurgical enterprises are unable to meet the challenges of the global crisis, especially ferrous metals overproduction, falling demand for low-quality metallurgical products, increasing number of competitors in world markets. A separate issue is fixed assets that are the leading factor in the successful operation of the production process. This paper is devoted to the investigation of the development status of metallurgical industry in Ukraine and its provision with fixed assets under modern economic conditions. In particular, the issue concerning the number of economic entities in the field of metallurgical industry of Ukraine and the number of employees at these enterprises and the factors influencing this indicator are highlighted in this paper. The dynamics of metallurgical enterprises sales, the structure of metallurgical production and the structure of foreign trade in terms of the papers of metal products sales are analyzed. Since the state of the metalworking industry can also be considered in terms of the enterprises provision with fixed assets, which maintain stable technological cycle, the rhythm of production and its quality, the essence of the term «fixed assets» is investigated in the scientific literature and indicators of the state and efficiency of fixed assets at the enterprises of Ukraine metalworking industry are analyzed. On the basis of the carried out investigations, we have come to the conclusion that this industry has a number of problems. Particular attention is paid to the reduction of employees number with relatively small fluctuations in the number of business entities in the metallurgical industry, which can cause a shortage of labor resources. In addition, despite the increase in the level of capital and capital efficiency and, consequently, the reduction of capital intensity, the issue of technologically obsolete, and therefore inconsistent with modern conditions of economic activity equipment, remains important at present.

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Li, Zhang, S. L. Gobbi, F. Bonollo, A. Tiziani et G. Fontana. « Metallurgical investigation of laser welds in wrought Waspaloy ». Science and Technology of Welding and Joining 3, n^o 1 (février 1998) : 1–7. http://dx.doi.org/10.1179/stw.1998.3.1.1.

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Corni, F., C. Nobili, G. Ottaviani, R. Tonini, B. Grignaffini Gregorio et G. Queirolo. « Metallurgical and electrical investigation of Pt5Ni95/silicon interactions ». Applied Surface Science 91, n^o 1-4 (octobre 1995) : 107–11. http://dx.doi.org/10.1016/0169-4332(95)00104-2.

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Jha, Abhay K., K. Sreekumar, M. C. Mittal et P. P. Sinha. « Failure of 35NCD16 steel fastener – A metallurgical investigation ». Engineering Failure Analysis 16, n^o 1 (janvier 2009) : 302–8. http://dx.doi.org/10.1016/j.engfailanal.2008.05.003.

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Dhokey, N. B., J. Dandawate, H. Gangurde et A. Harle. « Metallurgical investigation of cryogenically cracked M35 tool steel ». Engineering Failure Analysis 21 (avril 2012) : 52–58. http://dx.doi.org/10.1016/j.engfailanal.2011.11.013.

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Omran, Mamdouh, Timo Fabritius et Ahmed Abdelrahim. « Effect of Metallurgical Waste Properties on Determining Suitable Recycling Method ». Key Engineering Materials 835 (mars 2020) : 297–305. http://dx.doi.org/10.4028/www.scientific.net/kem.835.297.

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Recycling of solid waste generated from metallurgical industries will avoid disposal of wastes, enhance the use of secondary raw material fines and save costs. Numerous hydrometallurgical and pyrometallurgical processes, or a combination of both, have been proposed for the utilization of metallurgical waste. Due to insufficient knowledge of the properties of these wastes, most of these attempts still have some technical difficulties. Investigation the properties of metallurgical waste is needed before choosing the suitable recycling process.The present work describes the chemical, morphological and mineralogical properties of blast furnace sludge (BFS) and basic oxygen furnace sludge (BOFS) produced in steel plants in Finland. The investigations indicated that BFS and BOFS show significant contents of iron and coke. The sludges also contain considerable concentrations of unwanted elements such as Zn. The authors propose that microwave dezincing followed by briquetting or pelletization represent a potential method for sludges recycling. Owing to high Fe and C content it can be utilized as self-reducing material.

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Banaszek, Grzegorz, Kirill Ozhmegov, Anna Kawalek, Sylwester Sawicki, Medet Magzhanov et Alexandr Arbuz. « Investigation of the Influence of Hot Forging Parameters on the Closing Conditions of Internal Metallurgical Defects in Zirconium Alloy Ingots ». Materials 16, n^o 4 (8 février 2023) : 1427. http://dx.doi.org/10.3390/ma16041427.

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In this article, we present research results on the closing conditions of internal metallurgical discontinuities during the hot elongation operation of a Zr-1%Nb alloy ingot using physical and numerical modeling. Research on the influence of thermal and deformation parameters of elongation operations on the rheological behavior of a Zr-1% Nb alloy was conducted using the Gleeble 3800 metallurgical process simulator. Modeling of the influence of thermal–mechanical parameters of hot elongation operations in combinations of rhombic and flat anvils on the closure of metallurgical discontinuities was performed with the help of the FORGE®NxT 2.1 program. Based on the results of the research, recommendations were made regarding forging elongation technology and the geometry of working tools in order to ensure the closure of metallurgical discontinuities during hot elongation operations of Zr-1% Nb alloy ingots.

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Bradley, S. A., K. W. Hagglund, L. So, A. Stolarski et B. L. Tiemens. « Unraveling the Mystery:Using Microscopy in a Metallurgical Failure Investigation ». Microscopy and Microanalysis 19, S2 (août 2013) : 1034–35. http://dx.doi.org/10.1017/s1431927613007162.

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Xu, M., et S. Wilson. « Investigation of seasonal metallurgical shift at inco's clarabelle mill ». Minerals Engineering 13, n^o 12 (octobre 2000) : 1207–18. http://dx.doi.org/10.1016/s0892-6875(00)00105-9.

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Krishnakumar, K., et Arockia Selvakumar. « Metallurgical investigation of failure analysis in industrial machine components ». Materials Today : Proceedings 27 (2020) : 2076–80. http://dx.doi.org/10.1016/j.matpr.2019.09.071.

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Das, Souvik, Sandip Talukdar, Anup Kumar et Goutam Mukhopadhyay. « Metallurgical investigation of welding wire rod grade during processing ». Engineering Failure Analysis 118 (décembre 2020) : 104884. http://dx.doi.org/10.1016/j.engfailanal.2020.104884.

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Das, Souvik, Sandip Talukdar, Vikas Solanki, Anup Kumar et Goutam Mukhopadhyay. « Breakage of Spring Steel During Manufacturing : A Metallurgical Investigation ». Journal of Failure Analysis and Prevention 20, n^o 5 (17 septembre 2020) : 1462–69. http://dx.doi.org/10.1007/s11668-020-00993-9.

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Palit, Piyas, Souvik Das et Jitendra Mathur. « Metallurgical investigation of wire breakage of tyre bead grade ». Case Studies in Engineering Failure Analysis 4 (octobre 2015) : 83–87. http://dx.doi.org/10.1016/j.csefa.2015.09.003.

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Rao, V. Bhujanga, R. Rajendran, A. V. Jaykumar et K. H. B. S. Satyanarayana. « Metallurgical Investigation of HSLA Steel Subjected to Underwater Explosion ». Shock and Vibration 1, n^o 4 (1994) : 385–94. http://dx.doi.org/10.1155/1994/375854.

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The metallurgical behaviour of HSLA steel subjected to underwater explosion is of prime importance because of its structural applications in underwater vehicles. HSLA steel plates 300 × 250 × 4 mm were subjected to single and repetitive shock loadings and the point of rupture was identified. Test plates exhibited mode-I (large ductile deformation) and mode-II (tensile tearing) macroscopic failures. Electron micrographic and fractographic examination showed that the initiation of fracture was due to adiabatic shearing and the microscopic mode of failure was ductile. Plates subjected to single shock showed an increase in residual hardness and at the point of rupture it was approximately one-third higher than the initial residual hardness.

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Malfatti, Jonas, Claudia Principe et Gabriele Gattiglia. « Archaeomagnetic investigation of a metallurgical furnace in Pisa (Italy) ». Journal of Cultural Heritage 12, n^o 1 (mars 2011) : 1–10. http://dx.doi.org/10.1016/j.culher.2010.03.005.

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Dai, Yan Yang, Zhui Zhong et Hai Yun Zhong. « Recovery Leaching of Niobium from Metallurgical Residues ». Advanced Materials Research 236-238 (mai 2011) : 2554–59. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.2554.

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Niobium was recovered by acid-alkaline leaching from metallurgial residues. The experimental results indicate that effects of different leaching system and leaching conditions on the Nb recovery were different. Separation of niobium and impurities such as iron, manganese, calcium and silicon is essential for Nb recovery. Acid leaching distributed metals between the solid and solution. While about 98%Nb remains in the leached mud when alkaline sintering–leaching processed. According to the investigation of comprehensive process of acid-base, tungsten residue was leached with a double excess of 15%HCl at 60°C for 90mins,and leached mud was mixed with soda as W(soda)/W(residue) =0.37，then Sintered at 850°C for 90mins，gained concentrated material with 2.74%Nb2O5after leaching at 95°C for 60mins. 86.8%Nb remain in the mud. Product containing 15.8% Nb2O5was gained via decomposition by HF+H2SO4system and solvent extraction with MIBK. Wasted residue from alkali leaching of tin metallurgical slag were deal with the same conditions and concentrate containing 17.02% Nb2O5was gained.

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Pantazopoulos, G., Athanasios Vazdirvanidis et D. C. Papamantellos. « Metallurgical Investigation on Low Ductility Failures of Cu-ETP Components ». Materials Science Forum 638-642 (janvier 2010) : 3901–6. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.3901.

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In the present paper, the investigation on low ductility failures occurred to ETP copper strips and connectors manufactured from cold stamping of copper tubes is presented. Optical microscopy, SEM/EDS for macro- and microfractography and local elemental analysis along with tensile testing were employed as the principal analytical techniques in the context of the present investigation. Casting defects and microstructural abnormalities associated to hydrogen induced cracking (H.I.C.) are the principal contributors of the examined failures.

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Kavafaki, Sofia, George Bomis, Kyriaki Drakaki, Athanasios Varoutoglou, Konstantinos Kiourtzidis, George Z. Kyzas et Athanasios C. Mitropoulos. « Investigation of Duplex Brass Membranes with Metallography, Permeability and Treatments : Work-Hardening, Annealing and Quenching ». ChemEngineering 5, n^o 4 (3 novembre 2021) : 76. http://dx.doi.org/10.3390/chemengineering5040076.

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This paper consists of the fabrication and investigation of metal membranes and the study of their behaviour and applications in gas separation processes. The scope is to produce and characterize the porous crystal structure of brass alloy (standardization: DIN 17660) membranes and measure their permeability with helium as a penetrant medium. Another part of this study is to alter the brass alloy’s structure throughout metallurgical treatments and investigate how the permeability is allied to the structure’s alteration. This work merges the knowledge and technology of inorganic porous materials science in metallurgy. The novelty of the current research resides in the process to alternate the brass alloy structure throughout metallurgical treatments and how it is allied to the permeability of the membrane, which is of interest to be investigated. The results of the research are analysed and compared conducting the final inferences. All metallurgical treatments resulted in low permeability values when compared to a non-treated specimen. Specifically, the drop in permeance ranged from 76 up to 99.56%. It is noted that consecutive treatments contributed to even further decreases.

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Ma, Chang Ik, Ho Do Lee et Dae Up Kim. « Mechanical and Microstructural Properties Investigation on Rheocast Automotive Parts Using A356 Alloy ». Solid State Phenomena 116-117 (octobre 2006) : 489–92. http://dx.doi.org/10.4028/www.scientific.net/ssp.116-117.489.

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Variations of cooling characteristics and solidification microstructure were investigated at various melt pouring temperature, mold temperature and cooling condition for semi-solid slurry of A356 alloy. And metallurgical and mechanical properties were examined with testing samples made by rheocast process based on the obtained cooling conditions. Undercooled state of melt appeared when superheating of melt was below 35, and it was easy to form equiaxed solidification structure. Forced cooling hardly ever contributed to globular shaping of microstructure although it helped a little to refine microstructure. And slow cooling through insulation and mold heating was effective to form globular shape. Also, the metallurgical and mechanical properties of samples made by this process were better than those of other sample made by conventional processes.

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Gao, Qiang, Xixi Su, Peng Huang, Xi Sun, Zhanhao Feng et Guoyin Zu. « Investigation of the Indentation Resistance of Aluminum Foam Sandwich Panels with Metallurgical Bonding Interfaces under Low-Velocity Impact ». Materials 16, n^o 6 (10 mars 2023) : 2221. http://dx.doi.org/10.3390/ma16062221.

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The impact resistance of aluminum foam sandwich panels (AFS) with metallurgical bonding interfaces prepared by the powder cladding rolling method was investigated. Low-velocity impact tests were conducted by using a drop-weight impact facility to explore the dynamic mechanical behavior, deformation and damage mechanisms, and energy absorption of AFS with metallurgical bonding interfaces. The effects of variation of impact energy, panel thickness, and specimen density on the energy absorption performance of AFS were quantitatively evaluated by energy absorption indicators. The results indicate that the load-displacement curve illustrates prominent three-stage characteristics when the impact energy is 120 J containing the front panel yielding stage, the foam core’s compressive and shear failure stage, and the back panel fracture stage. The impact strength of the sandwich structure increases with increasing panel thickness and specimen density. The AFS with metallurgical bonding interfaces presents favorable energy absorption efficiency under low velocity.

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Dmitriev, Andrey N., Galina Yu Vitkina et Yu A. Chesnokov. « Methodical Basis of Investigation of Influence of the Iron Ore Materials and Coke Metallurgical Characteristics on the Blast Furnace Smelting Efficiency ». Advanced Materials Research 602-604 (décembre 2012) : 365–75. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.365.

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A new method of the estimation of influence of the iron ore materials and coke metallurgical properties on the efficiency of blast furnace smelting is developed. It consists in the following stages: the laboratory tests with the definition of the iron ore materials and coke metallurgical properties; the analytical study of the influence of these characteristics on the efficiency of blast furnace smelting using by mathematical models; the experimental industrial and industrial tests. The developed methodological basis allows to obtain improved criteria for evaluating the metallurgical characteristics of the raw materials and to explain the mechanism of their effect on the reaction of the direct and indirect recovery in the blast furnace. Therefore it allows to formulate recommendations to improve the blast furnace smelting technology.

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D. Swetha et al.,, D. Swetha et al ,. « Investigation of Mechanical , Metallurgical Properties of Hybrid Metal Matrix Composites ». International Journal of Mechanical and Production Engineering Research and Development 9, n^o 1 (2019) : 373–78. http://dx.doi.org/10.24247/ijmperdfeb201936.

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Niebuhr, D. V. « Metallurgical failure analysis of a horse trailer : A criminal investigation ». Journal of Failure Analysis and Prevention 6, n^o 4 (août 2006) : 11–16. http://dx.doi.org/10.1361/154770206x117513.

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CUI, JIANFENG, et XIAOHONG WU. « AN EXPERIMENTAL INVESTIGATION ON LEAD ISOTOPIC FRACTIONATION DURING METALLURGICAL PROCESSES ». Archaeometry 53, n^o 1 (16 décembre 2010) : 205–14. http://dx.doi.org/10.1111/j.1475-4754.2010.00548.x.

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Sugino, K., H. Kageyama, T. Kuroki, C. Urashima et A. Kikuchi. « Metallurgical investigation of transverse defects in worn rails in service ». Wear 191, n^o 1-2 (janvier 1996) : 141–48. http://dx.doi.org/10.1016/0043-1648(95)06745-0.

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Yu, Z. W., et X. L. Xu. « Failure analysis and metallurgical investigation of diesel engine exhaust valves ». Engineering Failure Analysis 13, n^o 4 (juin 2006) : 673–82. http://dx.doi.org/10.1016/j.engfailanal.2004.10.018.

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Sapate, S. G., et V. K. Didolkar. « Metallurgical investigation of failure of coal mill drag chain pin ». Materials & ; Design 30, n^o 7 (août 2009) : 2623–29. http://dx.doi.org/10.1016/j.matdes.2008.11.021.

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Jha, Abhay K., V. Diwakar, K. Sreekumar et M. C. Mittal. « Cracking of AFNOR 7020 aluminium alloy component : A metallurgical investigation ». Engineering Failure Analysis 13, n^o 8 (décembre 2006) : 1233–39. http://dx.doi.org/10.1016/j.engfailanal.2005.11.002.

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Grafe, Hans-Joachim, Wolfgang Löser, Steffen Schmitz, Miroslava Sakaliyska, Sabine Wurmehl, Stefan Eisert, Birk Reichenbach et al. « NMR investigation of boron impurities in refined metallurgical grade silicon ». physica status solidi (a) 212, n^o 9 (27 avril 2015) : 2031–36. http://dx.doi.org/10.1002/pssa.201431908.

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Zschiesche, Christoph, et Jürgen Antrekowitsch. « Fundamental Investigation for Processing of Pb-Cu-S-Bearing Materials ». Metals 12, n^o 1 (3 janvier 2022) : 74. http://dx.doi.org/10.3390/met12010074.

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The processing of polymetallic materials provides some challenges to every flowsheet. Within Aurubis Cu-Pb-metallurgical flowsheet, a broad range of raw materials and intermediates are processed. Continuous improvements are required to adapt the flowsheet according to the changing material quantity and quality. Therefore, thermodynamic modeling is the desired and most efficient way to conduct scenario analysis. Hence, databases and software are becoming better and better as the acceptance of this method increased. Further understanding is promoted by conducting experimental test work to validate the calculated results. In this research work, the impact of various oxygen potential on the formation of the condensed phases’ slag, matte, speiss and crude lead were investigated. A frequent check of slag metallurgy, in particular, the iron and lead concentration, provide feedback if the metallurgical process is operating at the right oxygen potential. Following, the calculated distribution coefficients for Cu, Pb, As, Sb, Sn and Ni between matte/speiss and speiss/lead are discussed.

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Valença, Silvio Leonardo, Cochiran Pereira dos Santos, Gabriela Oliveira Valença et Orlando Pedreschi Neto. « Investigation of corrosive processes in the hull of a shipwreck in 1905 ». Research, Society and Development 11, n^o 12 (6 septembre 2022) : e41111234104. http://dx.doi.org/10.33448/rsd-v11i12.34104.

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This study presents the analysis and characterization of the corrosive process in the metallic material that makes up the hull of a shipwreck in 1905 in the Baia de Todos os Santos in the city of Salvador - Bahia - Brazil. Samples were collected from fragments of the shipwreck's hull by scuba diving. The results obtained through techniques such as electrochemistry and scanning electron microscopy, allowed the analysis of the process and products of corrosion in the metallurgical structure, as well as metallography to verify the phases present in its structure after the manufacturing process in the last century. The constitution of the Black Adder's hull, built in 1869, consists of a low carbon steel alloy, containing high levels of impurities, mainly phosphorus and sulfur, demonstrating the low metallurgical quality of the time.

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Smith, Kenneth M., et Frederick E. Schmidt. « Marine Accident Investigation Techniques : Finding the Root Causes ». Marine Technology and SNAME News 42, n^o 04 (1 octobre 2005) : 210–19. http://dx.doi.org/10.5957/mt1.2005.42.4.210.

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A vessel that has been damaged by a fire and/or explosion, suffered a mechanical failure, or had some sort of accident that resulted in injuries or property loss is almost always the subject of an investigation to determine the root cause and significant contributing factors. This paper describes the investigation process, including the skills and special knowledge that is often required for a complete investigation. Using several case investigations, the synergy of combining marine/mechanical and metallurgical testing and analyses is also discussed. Several engineering disciplines typically are required to recreate the sequence of events, components involved, and most probable causes. Such issues as maintenance, controls, design, and fail-safe performance are the domain of the marine/mechanical specialist. Determination of the failure mode, role of corrosion, thermal degradation, and materials selection issues are typically evaluated by a metallurgist. Design, materials selection, and component fabrication methods can become significant issues.

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Samarkina, Irina, Aleksandr Sobolev, Nikita Bityuckiy, Igor' Pavel'ev et Stanislav Stopnickiy. « Investigation of Crack Appearance and Development at Strengthening Rolling Stock Parts by Inductive-Metallurgical Method ». Bulletin of scientific research results 2023, n^o 1 (27 mars 2023) : 105–13. http://dx.doi.org/10.20295/2223-9987-2023-1-105-113.

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Purpose: To conduct study to obtain data on the appearance and propagation of cracks in the layer that’s welded by induction-metallurgical method, cracks’ impact on exploitation safety of a part and its service age. Methods: Using metallographic studies, the analysis of samples of automatic coupler device with layer, welded by inductive-metallurgical way, was carried out. Results: According to the study results, it was confirmed that cracks do not propagate from welded layer into main metal of a part. Practical significance: The conducted study of crack presence and propagation estimation made it possible to prove further safe exploitation of a part without its performance loss or its structure or technical characteristics deterioration.

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Hong, Kairong, Yong Wang, Jianjun Zhou, Canfeng Zhou et Luming Wang. « Investigation on ultrasonic assisted friction stir welding of aluminum/steel dissimilar alloys ». High Temperature Materials and Processes 40, n^o 1 (1 janvier 2021) : 45–52. http://dx.doi.org/10.1515/htmp-2021-0011.

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Abstract The extensive use of light metal material such as aluminum has brought about problems in its joining with steel. However, the weak metallurgical bonding between the dissimilar materials and the formation of hard and brittle intermetallic compounds (IMCs) lead to unsatisfactory joint strength. Aiming at achieving high-quality joining of aluminum and steel, 6061-T6 aluminum and 301L steel alloys were lap joined by ultrasonic assisted friction stir lap welding (UaFSLW) in this study. The UaFSLW joints were well formed with uniform flashes and even arc lines. The strong plastic flow of the aluminum material driven by the dual effects of mechanical stirring and ultrasonic vibration inhibited the excessive growth of the Al–Fe IMCs at the lap interface. Thanks to the enhanced metallurgical bonding and the effective control of the layer thickness of IMCs, the tensile load of the UaFSLW joint under 1,800 rpm reached 16.5 kN, which was an increase of 27.9% compared to that of the conventional FSLW joint.

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Calliari, Irene, Maurizio Magrini, Rodolfo Martini, Chiara Tellini et Eugenio Vajna de Pava. « Metallurgical and Technological Investigation on Augustean Auxiliary Coins from Thraco-Moesia ». ArchéoSciences, n^o 35 (30 avril 2011) : 9–18. http://dx.doi.org/10.4000/archeosciences.2879.

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Cagliyan, E., et F. Walter. « Metallurgical Failure Investigation of Overheated Brackets Made of Nimonic Alloy 90 ». Practical Metallography 52, n^o 11 (16 novembre 2015) : 665–78. http://dx.doi.org/10.3139/147.110251.

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Riesenbeck, S., T. Gädicke et A. Neidel. « Metallurgical Failure Investigation of Quench Cracking in Hexagonal Bolt Head Fasteners ». Practical Metallography 52, n^o 5 (15 mai 2015) : 270–80. http://dx.doi.org/10.3139/147.110256.

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Das, Souvik, Sandip Thalukdar, Goutam Mukhopadhyay et Sandip Bhattacharya. « Breakage of electrode grade steel wires during manufacturing : A metallurgical investigation ». Engineering Failure Analysis 95 (janvier 2019) : 199–205. http://dx.doi.org/10.1016/j.engfailanal.2018.09.026.

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Chandra, K., Amrita Mahanti, A. P. Singh, N. S. Joshi et Vivekanand Kain. « Metallurgical Investigation on Embrittlement of Copper Cable of an Electric Motor ». Journal of Failure Analysis and Prevention 19, n^o 3 (juin 2019) : 598–603. http://dx.doi.org/10.1007/s11668-019-00676-0.

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Jha, Abhay K., Swathi Kiranmayee m, Sushant K. Manwatkar et P. Ramesh Narayanan. « Metallurgical investigation of cracked Al–5.5Zn–2.5Mg–1.5Cu aluminium alloy valve ». Case Studies in Engineering Failure Analysis 1, n^o 3 (juillet 2013) : 179–85. http://dx.doi.org/10.1016/j.csefa.2013.04.006.

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Sudhakar, K. V. « Metallurgical investigation of a failure in 316L stainless steel orthopaedic implant ». Engineering Failure Analysis 12, n^o 2 (avril 2005) : 249–56. http://dx.doi.org/10.1016/j.engfailanal.2004.05.004.

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Deconihout, B., A. Bostel, P. Bas, S. Chambreland, L. Letellier, F. Danoix et D. Blavette. « Investigation of some selected metallurgical problems with the tomographic atom probe ». Applied Surface Science 76-77 (mars 1994) : 145–54. http://dx.doi.org/10.1016/0169-4332(94)90335-2.

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Jha, Abhay K., V. Diwaker et K. Sreekumar. « Metallurgical investigation on stainless steel bellows used in satellite launch vehicle ». Engineering Failure Analysis 13, n^o 8 (décembre 2006) : 1437–47. http://dx.doi.org/10.1016/j.engfailanal.2005.07.023.

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