摘要
为研究GH4742高温合金的晶粒长大行为,采用电子背散射衍射技术手段,对GH4742高温合金在1050~1140℃温度范围内进行了0~90 min的热处理实验,获得了不同温度和不同保温时间下合金的晶粒尺寸分布。结果表明,在γ′析出相析出温度之下(低于1095℃),晶粒长大缓慢,晶粒尺寸变化不大。当温度升高到γ′析出相析出温度之上(高于1095℃)时,晶粒尺寸明显增大,在温度为1140℃时,由开始的约63μm增大至保温90 min的约89μm。在综合考虑γ′相的钉扎效应的基础上,建立了GH4742高温合金的晶粒长大模型,并对晶粒长大行为进行了预测。结果表明,模型对等温和非等温条件下晶粒尺寸演变的预测都具有较高的准确度,可为GH4742高温合金的热处理工艺的制定和实际生产应用提供参考。
To study the grain growth behavior of GH4742 superalloy,the heat treatment experiments for 0-90 min of GH4742 superalloy were carried out at 1050-1140℃by the mean of electron backscattering diffraction(EBSD)technique and the grain size distributions of GH4742 superalloy at different temperatures and different holding time were obtained.The results show that below the precipitation temperature(below 1095℃)ofγ′precipitated phase,the grain grows slowly and the grain size changes little.When the temperature rises above the precipitation temperature(above 1095℃)ofγ′precipitated phase,the grain size increases obviously,from about 63μm at frist to about 89μm with 90 min holding time at 1140℃.Based on the comprehensive consideration of pinning effect ofγ′phase,the grain growth model of GH4742 superalloy was established,and the grain growth behavior was predicted.The results show that the model has high accuracy in predicting the grain size evolution under both isothermal and non-isothermal conditions,which can provide reference for the formulation of heat treatment process and practical production and application of GH4742 superalloy.
作者
张文文
冯阳
王帅杰
田强
刘鑫刚
ZHANG Wen-wen;FENG Yang;WANG Shuai-jie;TIAN Qiang;LIU Xin-gang(School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China;High Temperature Materials Research Division,Central Iron and Steel Research Institute,Beijing 100081,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2022年第10期117-125,共9页
Journal of Plasticity Engineering
基金
国家重大科技专项项目(2017-VI-0018-0090)。
