Ni-Cr-Mo-B特厚板钢的热压缩变形行为  

Hot compressive deformation behavior of Ni-Cr-Mo-B heavy plate steel

作　　者：高志玉[1,2] 潘涛[3] 王卓[3] 刘国权[1,4,5] 苏航[3] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]辽宁工程技术大学材料科学与工程学院,辽宁阜新123099 [3]钢铁研究总院工程用钢研究所,北京100081 [4]北京科技大学材料科学与工程学院,北京100083 [5]北京科技大学钢铁行业共性技术协同创新中心,北京100083

出　　处：《材料热处理学报》2015年第9期148-155,共8页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51071019;51371030);国家高技术研究发展计划(2013AA031601);国家科技支撑计划(2011BAE25B01)

摘　　要：利用Gleeble-3800热模拟试验机,研究了Ni-Cr-Mo-B特厚板钢在900~1150℃、应变速率为0.01~10 s-1、试样工程应变量为70%的热压缩变形行为。基于实验数据,使用回归分析的方法建立了Ni-Cr-Mo-B钢的双曲正弦Arrhenius型本构方程。采用应变硬化速率与应力关系曲线、实验流变曲线准确的确定了表征动态再结晶行为的重要特征参数：临界应力/应变、峰值应力/应变和稳态应力/应变。结果表明：Ni-Cr-Mo-B钢的热变形激活能（Q）为351074 J·mol-1;随着变形温度升高及应变速率减小,即Zener-Hollomon参数（Z）减小,各特征参数减小,有利于动态再结晶发生;临界应力与峰值应力比为0.89,临界应变与峰值应变之比为0.44。此外,基于Z参数,确定了Ni-Cr-Mo-B钢动态再结晶特征参数的数学预测模型。Hot compressive deformation behavior of Ni-Cr-Mo-B heavy plate steel was investigated using Gleeble-3800 simulator test from900 to 1150 ℃ with strain rate of 0. 01-10 s- 1and height reduction of 70%. Based on the test data,hyperbolic sine Arrhenius-type constitutive equation of the steel was established with linear regression analysis. Important characteristic parameters of dynamic recrystallization including critical stress / strain,peak stress / strain and steady-state stress / strain were determined accurately using curves of strain hardening rate versus stress and true stress versus true strain. The results show that the hot deformation activation energy Q = 351074J·mol- 1,and with increasing of temperature and decreasing of strain rate,it means the decreasing of Z parameter,the characteristic parameters decrease gradually,which is conducive to dynamic recrystallization. The ratio of critical stress and strain to peak stress and strain are found to be 0. 89 and 0. 44,respectively. Furthermore,the mathematical models to predict the characteristic parameters are established based on Z parameter.

关 键 词：特厚板钢 本构分析 动态再结晶 应变硬化速率 特征参数 

分 类 号：TG142.3[一般工业技术—材料科学与工程]