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Relevant bibliographies by topics / Dynamic recrystallisation

Academic literature on the topic 'Dynamic recrystallisation'

Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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Dissertations / Theses
Book chapters
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Journal articles on the topic "Dynamic recrystallisation"

1

Derby, B., and M. F. Ashby. "On dynamic recrystallisation." Scripta Metallurgica 21, no. 6 (June 1987): 879–84. http://dx.doi.org/10.1016/0036-9748(87)90341-3.

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Wheeler, John, Zhenting Jiang, David J. Prior, and Jan Tullis. "Dynamic Recrystallisation of Quartz." Materials Science Forum 467-470 (October 2004): 1243–50. http://dx.doi.org/10.4028/www.scientific.net/msf.467-470.1243.

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It is generally agreed that the driving force (plastic strain energy) is much too small to allow "classical" nucleation during static and dynamic recrystallisation, and that rotation/growth of subgrains is an alternative. The latter explanation predicts that new grains should begin at low angles to old grains. We have used electron backscatter diffraction on an experimentally deformed quartz polycrystal that has deformed by dislocation creep and partially recrystallised. In a region shortened by about 30% new grains are at high angles (much greater than 15º) to adjacent parent grains. A histogram of misorientation versus number of boundaries shows a gap at 15-20º. In its simple form we expect the subgrain rotation model to predict a spectrum of misorientations but with most of them being low angle. Instead, the histogram suggests that new boundaries began life as high-angle structures, so current models for deformation-induced nucleation require refinement.

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3

Roucoules, C., and P. D. Hodgson. "Post-dynamic recrystallisation after multiple peak dynamic recrystallisation in C–Mn steels." Materials Science and Technology 11, no. 6 (June 1995): 548–56. http://dx.doi.org/10.1179/mst.1995.11.6.548.

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Chen, Wei, Yanfei Gu, Yingping Guan, and Chunfa Dong. "Dynamic recrystallisation and modelling of microstructural evolution of high-titanium-content 6061 aluminium alloy." International Journal of Materials Research 111, no. 4 (May 1, 2020): 316–24. http://dx.doi.org/10.1515/ijmr-2020-1110407.

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Abstract The dynamic recrystallisation behaviour of high-titaniumcontent 6061 aluminium alloy was investigated by hot compression tests within the temperature range of 623- 783 K and at strain rates of 0.01 -10 s-1. The characteristics of the true stress-strain curves acquired in the hot compression tests were investigated, and it was observed that the dynamic recrystallisation of high-titanium-content 6061 aluminium alloy occurs within the range of deformation temperatures of 623 -783 K, with strain rates of 0.001 - 0.1 s-1as evinced by a physically-based constitutive analysis. The kinetic model of dynamic recrystallisation was deduced to describe the dynamic recrystallisation behaviour of high-titanium-content 6061 aluminium alloy, and the dynamic recrystallisation grain size model was also constructed.

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Buzolin, Ricardo Henrique, Leandro Henrique Moreno Guimaraes, Julián Arnaldo Ávila Díaz, Erenilton Pereira da Silva, Domonkos Tolnai, Chamini L. Mendis, Norbert Hort, and Haroldo Cavalcanti Pinto. "Restoration Mechanisms at Moderate Temperatures for As-Cast ZK40 Magnesium Alloys Modified with Individual Ca and Gd Additions." Crystals 10, no. 12 (December 16, 2020): 1140. http://dx.doi.org/10.3390/cryst10121140.

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The deformation behaviour of as-cast ZK40 alloys modified with individual additions of Ca and Gd is investigated at 250 °C and 300 °C. Compression tests were carried out at 0.0001 s−1 and 0.001 s−1 using a modified Gleeble system during in-situ synchrotron radiation diffraction experiments. The deformation mechanisms are corroborated by post-mortem investigations using scanning electron microscopy combined with electron backscattered diffraction measurements. The restoration mechanisms in α-Mg are listed as follows: the formation of misorientation spread within α-Mg, the formation of low angle grain boundaries via dynamic recovery, twinning, as well as dynamic recrystallisation. The Gd and Ca additions increase the flow stress of the ZK40, which is more evident at 0.001 s−1 and 300 °C. Dynamic recovery is the predominant restoration mechanism in all alloys. Continuous dynamic recrystallisation only occurs in the ZK40 at 250 °C, competing with discontinuous dynamic recrystallisation. Discontinuous dynamic recrystallisation occurs for the ZK40 and ZK40-Gd. The Ca addition hinders discontinuous dynamic recrystallisation for the investigated temperatures and up to the local achieved strain. Gd addition forms a semi-continuous network of intermetallic compounds along the grain boundaries that withstand the load until their fragmentation, retarding discontinuous dynamic recrystallisation.

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Medina, S. F., M. I. Vega, and Manuel Gómez. "Influence of TiN Particles on Dynamic and Static Recrystallization in Microalloyed Steels." Materials Science Forum 467-470 (October 2004): 1205–10. http://dx.doi.org/10.4028/www.scientific.net/msf.467-470.1205.

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This work has studied the influence of different Ti and N compositions on hot deformation strength by determining the peak stress of flow curves and the activation energy (dynamic recrystallisation). It has also assessed their influence on static recrystallisation by means of the statically recrystallised fraction versus time and the activation energy. A precipitate study performed by SEM and TEM has yielded a better understanding of the influence of the Ti/N ratio and precipitation state in hot deformation (dynamic and static recrystallisation). A correlation was found between for the finer distribution of precipitates, Ti/N ratio close to 1.5, smaller austenite grain, maximum activation energy for hot deformation (dynamic recrystallisation) and maximum activation energy for static recrystallisation.

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Tóth, L. S., A. Hildenbrand, and A. Molinari. "Dynamic recrystallisation in adiabatic shear bands." Le Journal de Physique IV 10, PR9 (September 2000): Pr9–365—Pr9–370. http://dx.doi.org/10.1051/jp4:2000961.

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8

Brechet, Y., Y. Estrin, and F. Reusch. "A dynamic recrystallisation criterion: DRX map." Scripta Materialia 39, no. 9 (October 1998): 1191–97. http://dx.doi.org/10.1016/s1359-6462(98)00317-0.

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9

LLORENS, MARIA-GEMA, ALBERT GRIERA, PAUL D. BONS, JENS ROESSIGER, RICARDO LEBENSOHN, LYNN EVANS, and ILKA WEIKUSAT. "Dynamic recrystallisation of ice aggregates during co-axial viscoplastic deformation: a numerical approach." Journal of Glaciology 62, no. 232 (March 18, 2016): 359–77. http://dx.doi.org/10.1017/jog.2016.28.

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ABSTRACTResults of numerical simulations of co-axial deformation of pure ice up to high-strain, combining full-field modelling with recrystallisation are presented. Grain size and lattice preferred orientation analysis and comparisons between simulations at different strain-rates show how recrystallisation has a major effect on the microstructure, developing larger and equi-dimensional grains, but a relatively minor effect on the development of a preferred orientation of c-axes. Although c-axis distributions do not vary much, recrystallisation appears to have a distinct effect on the relative activities of slip systems, activating the pyramidal slip system and affecting the distribution of a-axes. The simulations reveal that the survival probability of individual grains is strongly related to the initial grain size, but only weakly dependent on hard or soft orientations with respect to the flow field. Dynamic recrystallisation reduces initial hardening, which is followed by a steady state characteristic of pure-shear deformation.

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Tam, Kenneth J., Matthew W. Vaughan, Luming Shen, Marko Knezevic, Ibrahim Karaman, and Gwénaëlle Proust. "Modelling dynamic recrystallisation in magnesium alloy AZ31." International Journal of Plasticity 142 (July 2021): 102995. http://dx.doi.org/10.1016/j.ijplas.2021.102995.

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Dissertations / Theses on the topic "Dynamic recrystallisation"

1

Guest, Robert Paul. "The dynamic and meta-dynamic recrystallisation of the Ni-base superalloy Inconel 718." Thesis, University of Cambridge, 2005. https://www.repository.cam.ac.uk/handle/1810/272127.

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Vernooij, Martine G. C. Vernooij Martine G. C. "Dynamic recrystallisation and microfabric development in single crystals of quartz during experimental deformation /." Zürich : [s.n.], 2005. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=16050.

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Manonukul, Anchalee. "Experimental and micro-mechanical investigation of dynamic recrystallisation in a model two-phase material." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.481540.

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Chimkonda, Nkhoma R. K. (Richard Kasanalowe). "Hot Working Characteristics of AISI 321 in Comparison to AISI 304 Austenitic Stainless Steels." Thesis, 2014. http://hdl.handle.net/2263/43302.

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Although the austenitic stainless steels 304 and 321 are often treated nominally as equivalents in their hot rolling characteristics, the question remains whether any subtle differences between the two allow further optimisation of their respective hot rolling schedules. The hot workability of these two types of austenitic stainless steels was compared through single-hit Gleeble simulated thermomechanical processing between 800℃ and 􀀄􀀅00℃ while the strain rate was varied between 0.00􀀄s􀀈􀀉 and 5s􀀈􀀉. It was found that the constants for the hyperbolic sinh equation for hot working of AISI 321 steel are Q = 465 kJ/mol, 􀀖􀀗 = 􀀘.􀀙6 􀀚 􀀄0􀀉􀀛 􀀜􀀝􀀞􀀈􀀉􀀟􀀈􀀉, 􀀠 = 0.00􀀘 􀀜􀀝􀀞􀀈􀀉 and 􀀡 = 6.􀀄 while for 304 steel the constants are Q = 446 kJ/mol, 􀀖􀀗 = 􀀅.􀀄4 􀀚 􀀄0􀀉􀀛 􀀜􀀝􀀞􀀈􀀉􀀟􀀈􀀉, 􀀠 = 0.008 􀀜􀀝􀀞􀀈􀀉and 􀀡 = 6.􀀄. It is shown that the occurrence of dynamic recrystallisation starts when the Zener-Hollomon parameter 􀀢 􀀣 6.4 􀀚 􀀄0􀀉􀀛s􀀈􀀉 for both steels but that the differences in the values of Q and A3 (the structure factor) between the two steels does lead to consistently lower steady state stresses for the steel 321 than is found in the steel 304 at the same Z values. This may, therefore, offer some scope for further optimisation of the hot rolling schedules and in particular in the mill loads of these two respective steels. A modelled constitutive equation derived from hot working tests to predict hot rolling mill loads is proposed and validated against industrial hot rolling data for AISI 321 stainless steel. Good correlation is found between the predicted Mean Flow Stress, the Zener-Hollomon Z parameter and actual industrial mill load values from mill logs if allowances are made for differences in Von Mises plane strain conversion, friction and front or back end tension. The multipass hot working behaviour of this steel was simulated through Gleeble thermomechanical compression testing with the deformation temperature varying between 1200℃ down to 800℃ and the strain rate between 0.001s-1 and 5s-1. At strain rates greater than 0.05s-1, dynamic recovery as a softening mechanism was dominant, increasing the dynamic recrystallisation to dynamic recovery transition temperature DRTT to higher temperatures. This implies that through extrapolation to typical industrial strain rates of about 60s-1,most likely no dynamic recrystallisation in plant hot rolling occurs in this steel but only dynamic recovery. Grain refinement by DRX is, therefore, unlikely in this steel under plant hot rolling conditions. Finally, mill load modelling using the hot working constitutive constants of the near-equivalent 304 instead of those specifically determined for 321, introduces measurable differences in the predicted mill loads. The use of alloy-specific hot working constants even for near-equivalent steels is, therefore, recommended.
Thesis (PhD)--University of Pretoria, 2014.
lk2014
Materials Science and Metallurgical Engineering
PhD
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Book chapters on the topic "Dynamic recrystallisation"

1

Meshcheryakov, Yurii. "A Mesoscale Approach to Dynamic Recrystallisation." In Shock Wave and High Pressure Phenomena, 167–82. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4530-3_12.

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Skrotzki, Werner, Burghardt Klöden, I. Hünsche, R. Chulist, Satyam Suwas, and László S. Tóth. "Influence of Dynamic Recrystallisation on Texture Formation in ECAP deformed Nickel." In Materials Science Forum, 575–80. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-443-x.575.

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Abbod, M. F., M. Mahfouf, D. A. Linkens, and C. M. Sellars. "Modelling of Dynamic Recrystallisation of 316L Stainless Steel Using a Systems Approach." In THERMEC 2006, 2455–60. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-428-6.2455.

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4

D. Moita, Raquel, Henrique A. Matos, Cristina Fernandes, Clemente P. Nunes, and Mário J. Pinho. "Influence of brine spray system on the thermal salt recrystallisation process by dynamic simulation." In Computer Aided Chemical Engineering, 479–84. Elsevier, 2007. http://dx.doi.org/10.1016/s1570-7946(07)80103-9.

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Conference papers on the topic "Dynamic recrystallisation"

1

Guest, R. P., and S. Tin. "The Dynamic and Metadynamic Recrystallisation of IN 718." In Superalloys. TMS, 2005. http://dx.doi.org/10.7449/2005/superalloys_2005_373_383.

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2

Calla, E., D. G. McCartney, and P. H. Shipway. "Deposition of Copper by Cold Gas Dynamic Spraying: an Investigation of Dependence of Microstructure and Properties of the Deposits on the Spraying Conditions." In ITSC2004, edited by Basil R. Marple and Christian Moreau. ASM International, 2004. http://dx.doi.org/10.31399/asm.cp.itsc2004p0352.

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Abstract In the Cold Gas Dynamic Spray (CGDS) process, coatings are deposited by the virtue of the high particle velocity achieved by the use of converging-diverging (de Laval) nozzle along with suitable particle characteristics and process parameters. In this study copper coatings were deposited on aluminium substrates using helium as the accelerating gas. The influence of the CGDS conditions, primarily driving gas temperature and pressure, on the nature of the deposited coatings and the deposition efficiency of the process were investigated. The results indicate that it is possible to deposit copper coatings at a wide range of process conditions, with successful deposition being observed with the driving gas at room temperature and 11 bar pressure (a condition where the nozzle is still choked). However, the nature of the coatings is strongly dependent upon the processing conditions. With room temperature driving gas, an increase in pressure lead to an increase in deposition efficiency, and increase in substrate deformation and an increase in microhardness in the deposit due to higher levels of work hardening. The use of driving gas at temperatures as low as 473 K resulted in recrystallisation in the deposit and a decrease in tendency to debond due to stress relief during recrystallisation. Recrystallisation also manifested itself in reduced hardness. The sensitivity of the recrystallisation conditions to the traverse speed of the jet over the substrate indicated that these processes are initiated by the impingement of the hot gas jet onto the deposit following deposition and not by changes in velocity or temperature of the particles upon impact.

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3

Wang, Mingxiang, Peihao Geng, Hong Ma, and Guoliang Qin. "Mechanical Property and Microstructure of IN718/FGH96 Dissimilar Superalloy Linear Friction Weldment." In ASME 2022 17th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/msec2022-85288.

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Abstract Wrought superalloy IN718 and powder metallurgy (P/M) FGH96 were joined by linear friction welding (LFW). The variation of microstructure and mechanical properties at different welding parameters has been investigated. Macrostructural examination of the double flash morphology indicated a conservative shortening length of 2.57 mm that was recommended to extrude out the original surface contaminants into the flash. Weld zone of the joint was featured with weld interface zone (WIZ) and thermo-mechanically affected zone (TMAZ), where deformed morphology tended to be more narrow with increasing applied pressure. The increasing oscillatory frequency or decreasing applied pressure promoted the refinement of dynamically recrystallised γ matrix grain. The analysis of electron backscatter diffraction (EBSD) mapping of the weldments showed that dynamic recrystallisation (DRX) occurred in the weld zone of dissimilar nickel-based superalloy. Continuous dynamic recrystallisation (CDRX) became the predominant behaviour, accompanied by inconspicuous discontinuous dynamic recrystallisation (DDRX). The scanning electron microscope (SEM) shows that dissolution of the strengthening phase occurred from WIZ to TMAZ, strongly influencing hardness distribution across the interface. Sound joints with a higher interface strength than the base metals of IN718 were obtained.

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Walker, Mike, Paul Howes, Phil McNutt, Dave Harvey, Hong Dong, Fernando Cacho-Nerin, and Paul Quinn. "Characterization of Cold Sprayed Ni Alloy 718 Coatings." In ITSC2018, edited by F. Azarmi, K. Balani, H. Li, T. Eden, K. Shinoda, T. Hussain, F. L. Toma, Y. C. Lau, and J. Veilleux. ASM International, 2018. http://dx.doi.org/10.31399/asm.cp.itsc2018p0248.

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Abstract Repairing of Ni-alloy components using cold spray is being increasingly considered as an option in the aerospace industry. To further the understanding of the microstructure of Ni-alloy coatings and the bonding mechanism, gas atomised alloy 718 was sprayed onto carbon steel substrates to form 0.5mm thick coatings and single particle impacts. Spray trials were performed with different process parameters to compare the splat and coating morphology/microstructure and to optimise the parameters. The powder consumable, single particle impacts and coatings were characterised using SEM, EBSD, TEM and nanoscale XRF and XRD. Four-point bend tests were performed to test strength, ductility, cracking and de-bonding. Fine grains were observed in the substrate-particle interfaces caused by particle fragmentation, deformation and dynamic recrystallisation. Low angle grain boundaries and sub-grains form in the substrate due to strain induced by high energy impacts. The deposition efficiency, thickness, porosity, hardness and surface roughness of the coatings were measured and compared across all parameters. The porosity decreases notably (1.2% to 0.25%) and the hardness increases (410HV to 465 HV) with the increase in gas temperature and pressure. The results indicate that temperature has a larger effect on the coating properties compared to the pressure and that deformation has an important role in bonding.

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