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Effect of initial grain size on the Hot Deformation Behavior and Microstructural Evolution of Pure Copper

Acta Metallurgica Sinica(English Letters) 2022年第4期35卷 662-678页

作者： H.R.Rezaei Ashtiani A.A.Shayanpoor School of Mechanical Engineering Arak University of Technology38135-1177ArakIran

The influences of initial grain size(IGS)with 20μm and 50μm on the hot flow behavior and microstructural changes of pure copper were investigated using hot compression tests at a temperature range of 623–1073 K and strain rate range of 0.001–0.1 s^(-1).The effects of critical stress and corresponding critical strain were studied based on the internal and external processing *** critical stress and strain decreased with increasing temperature and decreasing strain *** investigation results of the microstructure and true strain–stress diagrams showed that dynamic recovery,dynamic recrystallization(DRX),and twinning mechanisms were caused during the hot deformation of pure *** evolution indicated some DRXed fine-grain took place around grain boundary of hot deformed samples with IGS of 20μm whereas DRXed fine-grain took place in interior grains for samples with larger *** results also showed that grain growth is also dependent on IGS as the grain growth rate for samples with the larger IGS is greater than the smaller *** critical strain rate and the temperature were obtained at 0.01 s^(-1) and 973 K,respectively,for the sudden change in the grain growth ***,twinning highly depended on IGS which almost did not happen in fine grain size while the volume fraction of twinning increased with increasing grain size.

关键词： initial grain size Hot deformation Pure copper Microstructure Dynamic recrystallization(DRX) Twinning

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EFFECT OF initial grain size ON STATIC RECRYSTALLIZA-TION SOFTENING IN Cr STEEL USING STRESS RELAXATION TECHNIQUE

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Acta Metallurgica Sinica(English Letters) 2002年第6期15卷 487-491页

作者： A.R. MorgridgeMechanical Engineering Dept. of University of Ibadan, Ibadan, Nigeria Mech. Eng. Dept. Univ. of Ibadan Ibadan Nigeria

Effect of initial grain size (I.G.S.) on static recrystallization softeningin Cr steel (0.77 wt. percent Cr) has been investigated through the use of interrupted hotcompression tests and stress relaxation curves from Gleeble 1500. initial grain sizes were variedbetween 20 and 93 microns. Stress strains curves for Cr steel for different initial grain sizes andrecrystallization times have been highlighted. Similar observation was made for metadynamicrecrystallization with shorter retardation times. Statically recrystallized grain size alsoincreased as initial grain size increases. It is found that the values of initial grain size havesignificant effects on the mean flow stress and static recrystallization kinetics as well as thepeak strain values to initiate dynamic recrystallization.

关键词： initial grain size recrystallization stress relaxation

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New constitutive equation utilizing grain size for modeling of hot deformation behavior of AA1070 aluminum

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Transactions of Nonferrous Metals Society of China 2021年第2期31卷 345-357页

作者： H.R.REZAEI ASHTIANI A.A.SHAYANPOOR School of Mechanical Engineering Arak University of TechnologyArak38135-1177Iran

A new phenomenological and empirically-based constitutive model was proposed to modify the term in the original Johnson−Cook constitutive *** new model can be used to describe and predict the flow stress of AA1070 aluminum with different initial grain sizes in the hot working *** developed model considers thermal softening,strain-rate hardening,strain hardening,initial grain size,and interactions with each other and can correctly model the behavior of AA1070 at elevated temperature with different strains,strain rates,and initial grain *** hot flow behavior of AA1070 was investigated through compression tests over wide ranges of temperature from 623 to 773 K,strain rate from 0.005 to 0.5 s−1 and initial grain size from 50 to 450μ*** show that the initial grain size has a significant effect on the flow behavior of ***,correlation coefficient(R),average absolute relative error(AARE),and relative error were examined for comparative predictability of the *** show that flow stresses for different initial grain sizes calculated by the new proposed model perfectly correlate with experimental ones,with a mean relative error of 1.19%,which confirms that the new modified Johnson−Cook relation can give a precise estimation of the hot flow stress of AA1070 aluminum by considering the initial grain size.

关键词： constitutive equation modified Johnson−Cook model initial grain size flow stress hot deformation AA1070 aluminum

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