王旭青
,
张敏聪
,
罗俊鹏
,
彭子超
,
盛俊英
,
言建
航空材料学报
doi:10.11868/j.issn.1005-5053.2016.6.002
采用Gleeble-1500D热模拟试验机进行氩气雾化FGH95合金的热压缩实验,在不同的温度和应变速率下,获得FGH95合金的变形应力应变曲线,根据变形数据,建立FGH95合金的变形本构方程,并基于动态材料模型,绘制合金的热加工图。计算得到氩气雾化FGH95合金的变形激活能Q=695.78 kJ/mol,通过建立的本构方程计算得出的峰值应力与实验值符合较好,平均误差范围约6%；根据热加工图,确定FGH95合金安全的热加工区域如下：1070~1100℃,0.01~0.001 s-1,当温度增加到1100℃以上后,应变速率可以增大到0.5 s-1。
关键词:
氩气雾化FGH95合金
,
高温变形
,
本构方程
,
热加工图
ZHAO Jiarong YANG Jie Wuhan Iron and Steel University
,
Wuhan
,
China ZHAO Jiarong
,
associate professor
,
Faculty of Rolling
,
Wuhan Iron and Steel University
,
Wuhan 430081
,
China
金属学报(英文版)
Based on the analyses of hot-deformation mechanism of the steel,a new constitutive equation describing the flow stress of steels was derived.The flow stress data of steel 55SiMnVB have been determined at 900—1200℃,strain rates of 1—100s~(-1)and true-strain of 0.08—0.8.An available evaluated formula on the flows tress has been obtained by means of non-linear regression.It can express clearly the physical process of hot-deformation.
关键词:
flow stress
,
null
,
null
