HR3C奥氏体耐热钢的高温变形行为  

Hot deformation behavior of HR3C austenitic heat resistant steel

作　　者：刘艳芬[1] 卫英慧[1,2] 侯利锋[1] 李国栋[1] 李永刚[1] 

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024 [2]吕梁学院,山西吕梁033000

出　　处：《材料热处理学报》2015年第9期131-136,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51001079;51208333);高等学校博士点专项科研基金(20091402110010);山西省科技重大专项(20111101053);山西省自然科学基金(2011011020-2;2013011012-3)

摘　　要：通过Gleeble 1500D热力模拟实验机对HR3C奥氏体耐热钢进行单道次压缩试验,研究其高温变形行为。热变形温度为950~1250℃,应变速率范围0.001~1.0 s-1。结果表明,HR3C的流变应力随变形速率的降低和变形温度的升高而降低。变形温度越高,动态再结晶越容易发生;动态再结晶晶粒尺寸随温度的升高而增大,随变形速率的增大而减小。通过计算和回归分析得出HR3C钢的热激活能（558 k J/mol）和热变形本构方程;峰值应力与Z参数呈线性关系。To research the hot deformation behavior of HR3 C austenitic heat resistant steel,single pass compression tests were conducted by using a Gleeble 1500 D thermal-mechanical simulator at 950-1250 ℃ with strain rates of 0. 001-1. 0 s- 1. The results show that the flow stress of HR3 C steel decreases with the increasing of deformation temperature and the decreasing of strain rate. High deformation temperature promotes the occurring of dynamic recrystallization. The finer recrystallization grains are observed in the steel after dynanic recrystallization at lower temperaure and higher strain rate. The hot deformation activation energy of 558 k J / mol and the hot deformation equation are obtained through calculating and linear regression analysis. It is a linear relation between the peak stress and the ZenerHollomon parameter.

关 键 词：奥氏体耐热钢 流变应力 动态再结晶 热变形 

分 类 号：TG142.73[一般工业技术—材料科学与工程]