摘要
通过MTS热模拟试验机对铸态与锻态GH4738合金在变形温度1000~1150℃及应变速率0.01~1 s;的条件下进行压缩试验,其中压下量为10%、30%、50%。结果显示,两种状态的合金应力-应变曲线均具有典型的动态再结晶特征,存在加工硬化、流变软化和稳态流变3个阶段。由应力-应变曲线得出GH4738合金铸态及锻态热变形激活能分别为Q=575.89 kJ/mol及Q=588.04 kJ/mol。并利用EBSD分析发现,在相同的热变形参数下,锻态GH4738合金组织的动态再结晶要比铸态组织发生得更早、更显著。
By using MTS thermal simulator, compression tests were carried out on the as-cast and as-forged GH4738 alloy under the conditions of deformation temperature of 1000-1150 ℃ and strain rate of 0.01-1 s;, in which the reduction is 10%, 30% and 50%, respectively. The results show that the stress-strain curves of the alloy in two states both have typical characteristics of dynamic recrystallization, and there are three stages: work hardening, flow softening and steady-state flow. According to the stress-strain curves, the thermal deformation activation energies of as-cast and as-forged GH4738 alloy are Q=575.89 kJ/mol and Q=588.04 kJ/mol, respectively. The EBSD analysis shows that the dynamic recrystallization of as-forged GH4738 alloy occurs earlier and more significantly than that of as-cast alloy under the same thermal deformation parameters.
作者
苏醒
吕旭东
Su Xing;Lv Xuilong(Research Institute of High-temperature Materials,Central Iron and Steel Research Institute,Beijing 100081,China;Gaona Aero Material Co.,Ltd.,CISRI,Beijing 100081,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2021年第12期46-52,共7页
Heat Treatment of Metals
关键词
GH4738合金
热模拟
热变形行为
本构方程
GH4738 alloy
thermal simulation
thermal deformation behavior
constitutive equation
