Constitutive modeling and critical strain of dynamic recrystallization in SA508Gr.4N steel for advanced pressure vessel materials
作者机构：Institute for Special SteelsCentral Iron and Steel Research Institute GroupBeijing 100081China School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China
出 版 物：《Journal of Iron and Steel Research International》 (Journal of Iron and Steel Research, International)
年 卷 期：2018年第25卷第11期
页 面：1189-1197页
核心收录：
学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）]
基 金：supported by the National Energy Application Technology Research and Engineering Demonstrative Project of China 国家科技攻关计划项目
主 题：SA508Gr.4N steel Hot deformation Constitutive modeling Critical strain Dynamic recrystallization
摘 要：Using a Gleeble-1500D thermal-mechanical simulator,the hot-deformation behavior and critical strain in the dynamic recrystallization of SA508Gr.4N steel were investigated by compression tests from 1050 to 1250℃ with strain rates from 0.001 to 0.1 s^-***-strain curves were fitted by a nonlinear fitting *** on these tests,the flow stress constitutive equations of the work-hardening dynamical recovery period and dynamical recrystallization period Were established for SA508Gr.4N *** stress-strain curves of SA508Gr.4N steel predicted by the established models are in a good agreement with the experimental *** of ln θ -ε and --(a)(lnθ)/(a)ε-ε (where θ is the work-hardening rate and ε is true strain)were plotted from experimental data.A critical strain (εc)and a peak strain (εp)of dynamic recrystallization were obtained and exhibited a linear relationship,i.e.,εc =0.386ε*** predicted model of εc could be described by the equation of εc=1.604×10^-3Z^0.127.
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