GH3230合金高温热变形行为及微观组织变化  

Hot deformation behavior at high temperature and microstructure evolution of GH3230 alloy

作　　者：欧新哲 马天军[1] OU Xin-zhe;MA Tian-jun(Research Institute,Baoshan Iron&Steel Co.,Ltd.,Shanghai 200941,China)

机构地区：[1]宝山钢铁股份有限公司研究院,上海200941

出　　处：《塑性工程学报》2020年第4期93-100,共8页Journal of Plasticity Engineering

摘　　要：通过热压缩实验,研究了GH3230合金在温度950~1220℃和应变速率0.1~10 s^-1条件下的高温热变形行为,构建了高温变形抗力数学模型,并分析了微观组织的变化。结果表明:随着应变速率的增加和变形温度的降低,材料的高温变形抗力增大;变形温度的提高和应变速率的增加有利于动态再结晶的发生和动态再结晶晶粒的长大;GH3230合金高温变形抗力可用Zener-Hollomon参数的高精度双曲正弦函数描述,其中热变形材料常数为:A=1.22279×10^28,n=8.64987,α=0.00284,平均变形激活能Q=742.335 kJ·mol^-1;对于GH3230合金,采用高温和低应变速率可以获得优良的热加工等轴晶粒组织和低的加工变形抗力。The hot deformation behavior at high temperature of GH3230 alloy was investigated by hot compression test at the temperatures of 950-1220℃and strain rates of 0.1-10 s^-1,the mathematical model of high temperature deformation resistance was established,and the microstructure evolution was analyzed.The results show that with the increase of strain rate and the decrease of deformation temperature,the high temperature deformation resistance of the material increases;the increases of deformation temperature and strain rate are beneficial to the occurrence of dynamic recrystallization and the growth of dynamic recrystallization grains;the high temperature deformation resistance of GH3230 alloy can be described by the hyperbolic sine type function with Zener-Hollomon parameter.The material constants of hot deformation are as follow:A=1.22279×10^28,n=8.64987,α=0.00284,and the average hot deformation activation energy Q=742.335 kJ·mol^-1.For GH3230 alloy,fine thermal machining isometric grain structure and low machining deformation resistance can be obtained by high temperature and low strain rate.

关 键 词：GH3230合金 热变形 变形抗力模型 动态再结晶 微观组织 

分 类 号：TL341[核科学技术—核技术及应用]