热处理过程中FGH96合金的微观组织演变  

Microstructure evolution of FGH96 alloys during heat treatment

作　　者：王杰 黄海亮 张华[1] 张尚洲[1] 周鑫 江亮 WANG Jie;HUANG Haiiang;ZHANG Hua;ZHANG Shangzhou;ZHOU Xin;JIANG Liang(Institute for Advanced Studies in Precision Materials,Yantai University,Yantai 264010,China)

机构地区：[1]烟台大学精准材料高等研究院,烟台264010

出　　处：《粉末冶金技术》2023年第5期393-401,共9页Powder Metallurgy Technology

基　　金：国家重点研发计划资助项目(2021YFB3700401);国家自然科学基金资助项目(52201049);山东省高等学校青创引育计划创新团队资助项目(2021)。

摘　　要：通过热处理实验研究了热处理过程中FGH96合金的微观组织演化,量化了固溶温度和保温时间对晶粒尺寸、 γ'相尺寸、面积分数及晶粒分布的影响,分析了 γ'相和应变存储能对晶粒演变的影响。结果表明:在热处理过程中,含有大量应变存储能的变形晶粒发生静态再结晶,晶粒细化,而动态再结晶晶粒发生晶粒长大,当两者平衡时可获得均匀细小的晶粒组织。合金在1060℃保温120min后, γ'相尺寸和晶粒尺寸分布较为均匀,平均晶粒尺寸为7.37μm。 γ'相的面积分数随固溶温度和保温时间的增加而减小,一次 γ'相在亚固溶保温过程中存在粗化和分裂现象,使得一次 γ'相的面积分数和尺寸先增加后减小。 γ'相的非均匀溶解会导致局部晶粒长大较快,形成混晶。The microstructure evolution of FGH96 alloys during the heat treatment was studied.The effects of solution temperature and holding time on the grain size, γ'precipitate size,area fraction,and grain distribution were quantified.The influences of γ'precipitate and strain storage energy on the grain evolution were analyzed.The results show that,the deformed grains containing a large amount of strain storage energy during heat treatment undergo the static recrystallization and refine the grains,while the dynamic recrystallization grains grow.The uniform fine grain structure can be obtained as the two processes are balanced.After the alloy is held at1060℃for 120 min,the distribution of γ'precipitate size and grain size are more uniform,and the average grain size is 7.37μm.The area fraction of the γ'precipitate decreases with the increase of solution temperature and holding time,while the coarsening and splitting of the primary γ'precipitate during the subsolvus solution make the area fraction and size of the primary γ'precipitate increase first and then decrease.The inhomogeneous dissolution of γ'precipitate leads to the rapid growth of the local grains,forming the mixed crystals.

关 键 词：FGH96合金 微观组织:热处理 静态再结晶 γ'相 

分 类 号：TF123[冶金工程—粉末冶金] TG156.1[冶金工程—冶金物理化学]