IN783低膨胀高温合金的热变形行为和组织演变  

Hot Deformation Behavior and Microstructure Evolution of IN783 Low-Expansion Superalloy

作　　者：苏海 王晨[1] 罗通 黄海亮 张华[1] 张尚洲[1] 江亮 周鑫 Su Hai;Wang Chen;Luo Tong;Huang Hailiang;Zhang Hua;Zhang Shangzhou;Jiang Liang;Zhou Xin(Institute for Advanced Studies in Precision Materials,Yantai University,Yantai 264005,China;Guizhou Anda Aviation Forging Co.,Ltd,Anshun 561005,China)

机构地区：[1]烟台大学精准材料高等研究院,山东烟台264005 [2]贵州安大航空锻造有限责任公司,贵州安顺561005

出　　处：《稀有金属材料与工程》2024年第7期2006-2017,共12页Rare Metal Materials and Engineering

基　　金：山东省高等学校青年创新团队计划(2022KJ272);山东省泰山学者工程专项经费;山东省自然科学基金面上项目(ZR2022ME067

摘　　要：通过热压缩试验研究了IN783低膨胀高温合金在温度为1000~1120℃、应变速率为0.01~10 s^(-1)条件下的热变形行为,并采用电子背散射衍射(EBSD)研究了不同变形参数下合金的组织演变规律。结果表明,IN783合金的流变应力随着温度的升高和应变速率的减小而显著降低。基于Arrhenius方程和Zener-Hollomon参数模型,建立了该合金的本构方程为:ε=3.58237×10^(15)[sinh(0.00495724σ)]^(3.99121)exp(-417.146551/RT),可以很好地描述热变形过程中流变应力与变形温度和应变速率的关系。基于动态材料模型绘制了IN783合金的热加工图,并根据热加工图和微观组织分析,确定IN783镍基高温合金热加工的安全区间为:1000~1080℃/0.1~10 s^(-1),以及1000~1040℃/0.01~0.1 s^(-1)。此外,在高温低速率条件下(1060~1120℃、0.01 s^(-1)),尽管合金具有较高的功率耗散值,但会出现混晶组织和晶粒粗化现象,也不适合作为IN783合金的热加工区间。The hot deformation behavior of IN783 low-expansion superalloy was investigated through hot compression experiments at the deformation temperatures of 1000-1120 ℃ and strain rates of 0.01-10 s^(-1).The microstructure evolution of the alloy under different deformation conditions was studied using electron backscatter diffraction(EBSD).The results indicate that the flow stress of IN783 alloy is significantly decreased with the increase in deformation temperature and the decrease in strain rate.Combined with Arrhenius equation and Zener-Hollomon parameter model,the constitutive equation of the alloy was established as ε =3.58237 ×10^(15)[sinh(0.00495724σ)]^(3.99121).exp(-417.146551/RT),which can well describe the relationship between flow stress and deformation temperature,strain rate of IN783 alloy during hot deformation.The hot working diagram of IN783 alloy was drawn based on the dynamic material model.According to the hot working diagram and the microstructure observation,the safety zone for hot working of IN783 nickel-based superalloy is determined as:1000-1080 ℃/0.1-10 s^(-1) and 1000-1040 ℃/0.01-0.1 s^(-1).In addition,under the condition of high temperature and low strain rate(1060-1120 ℃,0.01 s^(-1)),mixed crystal and grain coarsening occur,which makes it not suitable for the hot working of IN783 alloy although the alloy has high power dissipation coefficient in those parameters.

关 键 词：IN783高温合金 热变形行为 热加工图 组织演变 

分 类 号：TG132.33[一般工业技术—材料科学与工程]