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热变形和热处理对GH4080A高温合金微观组织演化的影响 被引量:1

Effects of Hot Deformation and Heat Treatment on Grain Structure Evolution of GH4080A Superalloy
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摘要 对GH4080A高温合金进行热变形及后续的热处理试验,利用光学显微镜和扫描电子显微镜观察热变形和热处理后合金的显微组织,研究热变形参数和热处理参数对GH4080A合金组织演化的影响规律。结果表明:GH4080A合金在1030~1070℃内进行热处理时,晶粒尺寸变化不大;随着热处理时间的延长,可以促进合金内部元素重新分布,但不会影响晶粒尺寸大小;GH4080A合金大变形区晶粒在热处理后会发生异常长大,而小变形区晶粒生长量较小;随着应变速率的增加,GH4080A合金热处理后组织不均匀,晶粒粗大;变形温度对GH4080A合金热处理后组织的影响规律比较复杂,原始粗大晶粒在较低温度下动态再结晶不充分,热处理后会残留粗晶,在较高温度下动态再结晶充分,但温度过高会导致热处理后晶粒长大。 The thermal deformation and heat treatment experiments of GH4080A superalloy were performed,and the microstructure of the alloy after thermal deformation and heat treatment were observed by optical microscope and scanning electron microscoe to study the influence law of thermal deformation parameters and heat treatment parameters on the microstructrue evolution of GH4080A superalloy.The results show that:in the temperature range of 1030-1070℃,the heat treatment temperature has little effect on the grain size,and the grain shape at 1070℃tends to be more equiaxed grain;with the extension of heat treatment time,it can promote the redistribution of elements inside the alloy,but it does not affect the grain size;the grains in the large deformation zone of GH4080A superalloy grow abnormally after heat treatment,while the grain growth amount in the small deformation area is relatively small.With the increase of strain rate,the dynamic recrystallization of GH4080A superalloy is incomplete and there are original coarse grains,resulting in uneven microstructrue and coarse grains after heat treatment;the influence law of deformation temperature on the microstructrue after heat treatment is complicated,the original coarse grains are not fully recrystallized at lower temperature,and coarse grains remain after heat treatment,and the dynamic recrystallization at higher temperature is fully.However,too high temperature can lead to grain growth after heat treatment.
作者 李凯 杨丽媛 林莺莺 陈由红 王轶博 赵张龙 LI Kai;YANG Liyuan;LIN Yingying;CHEN Youhong;WANG Yibo;ZHAO Zhanglong(Center of Plastic Forming,Research and Engineering Technology,Beijing Institute of Aeronautical Materials,Beijing 100095,China;Institute of Surface Engineeriing,Beijing Institute of Aeronautical Materials,Beijing 100095,China;School of Material,Northeastern Polytechnic University,Xi'an 710072,China)
出处 《热加工工艺》 北大核心 2023年第4期144-149,共6页 Hot Working Technology
关键词 GH4080A 热变形 热处理 微观组织 GH4080A hot deformation heat treatment microstructure
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