Hastelloy G-3合金热变形特性研究  

Research on Hot Deformation Behavior of Hastelloy G-3 Alloy

作　　者：罗坤杰[1] 张麦仓[1] 王宝顺[1] 董建新[1] 

机构地区：[1]北京科技大学,北京100083

出　　处：《稀有金属材料与工程》2011年第4期605-609,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金重点项目(50831008)

摘　　要：利用变形温度为1050～1200℃、应变速率为0.1～10s-1的恒温热压缩试验系统分析了Hastelloy G-3合金的高温变形特性及变形后的组织特征。对高应变速率下的流动应力进行变形热效应修正,建立了G-3合金热变形过程中峰值应力与变形温度、应变速率关系的本构模型。结果表明:所建立的本构模型在预测G-3合金热变形峰值应力时具有良好的精确度,能够满足工程应用的要求。G-3合金热加工过程的软化机制为动态再结晶,根据热变形后的组织特征确定G-3合金合理的热变形温度为1180～1200℃,应变速率为5～0s-1。The hot deformation behavior and the subsequent microstructure characteristics of Hastelloy G-3 alloy were studied by isothermal compression tests at the strain rates of 0.1-10 s-1 and the temperatures of 1050-1200 oC. The flow-stress at high strain rates were corrected considering the effect of deformation heating, and a new constitutive relationship between peak stress and deformation temperature as well as strain rate for G-3 alloy at high temperature was established. The results show that the built material model has good fitting accuracy to satisfy the engineering need. The softening mechanism of G-3 alloy is dynamic recrystalization during hot working process. According to the microstructures after deformation, for G-3 alloy the proper deformation temperature is 1180-1200 oC and the proper strain rate is 5-10 s-1.

关 键 词：HASTELLOY G-3合金 高温变形特性 温升效应 本构关系 组织特点 

分 类 号：TG132.32[一般工业技术—材料科学与工程]