固溶温度对GH4710合金显微组织和硬度的影响  

Effects of Solution Temperature on Microstructure and Hardness of GH4710 Alloy

作　　者：宋伟伟 黄凯 黄帅 段方震 罗璇 王迪 杨科[7] SONG Weiwei;HUANG Kai;HUANG Shuai;DUAN Fangzhen;LUO Xuan;WANG Di;YANG Ke(Aviation Military Representative Room of the Army Armament Department in Shanghai,Shanghai 200233,China;Air China Hair Changzhou Lanxiang Machinery Co.,Ltd.,Changzhou 213022,China;Naval Equipment Department in Changzhou Regional Military Representative Office,The Chinese People's Liberation Army,Changzhou 213022,China;Beijing GAONA Materials and Technology Co.,Ltd.,Beijing 100081,China;High Temperature Materials Research Institute,Central Iron and Steel Research Institute,Beijing 100081,China;AECC South Industry Co.,Ltd.,Zhuzhou 412002,China;Hami Special Equipment Inspection and Testing Institute,Hami 839099,China)

机构地区：[1]陆军装备部驻上海地区航空军事代表室,上海200233 [2]中国航发常州兰翔机械有限责任公司,江苏常州213022 [3]中国人民解放军海军装备部驻常州地区军事代表室,江苏常州213022 [4]北京钢研高纳科技股份有限公司,北京100081 [5]钢铁研究总院高温材料研究所,北京100081 [6]中国航发南方工业有限公司,湖南株洲412002 [7]哈密市特种设备检验检测所,新疆哈密839099

出　　处：《热加工工艺》2023年第20期134-139,共6页Hot Working Technology

基　　金：国家自然科学基金项目(52074092)。

摘　　要：采用光学显微镜(OM)、扫描电镜(SEM)等方法研究了固溶温度对GH4710合金显微组织和硬度的影响。结果显示:GH4710合金在经过4 h过固溶处理后,该合金的平均晶粒尺寸随固溶温度升高而逐渐增大,晶界平直化程度逐渐增加,这与一次γ’相在过固溶温度下回溶至基体而无法钉扎晶界有关;由于在固溶冷却过程中的过冷度较小,因此二次γ’相的析出未呈现规律性;三次γ’相形貌变化不大,一直保持椭球状,三次γ’相的平均粒径先减小再增大,当固溶温度为1160℃时,三次γ’相的粒径为最小值;三次γ’相的单位面积分数和显微硬度呈现先升高再降低的趋势,当固溶温度为1170℃时,两者皆达最大值。晶粒尺寸的变化与该合金中一次γ’相的变化有关,GH4710合金硬度的变化与该合金中三次γ’相的分布有关。阐明了一次γ’相和三次γ’相在GH4710合金中的作用机理,为该合金的组织性能调控提供了理论依据。The effects of solution temperature on the microstructure and hardness of GH4710 alloy were studied by optical microscopy(OM)and scanning electron microscopy(SEM).The results show that the average grain size of GH4710 alloy increases gradually with the increase of solution temperature,and the degree of grain boundary flatness increases gradually,which is related to the fact that the primaryγ'phase is dissolved back into the matrix at the solution temperature and the grain boundary cannot be cemented.Due to the small degree of overcooling during solution cooling,the precipitation of the secondaryγ'phase does not show regularity.The morphology of the tertiaryγ'phase does not change much,and it has always maintained an ellipsoid shape.The average particle size of the tertiaryγ'phase first decreases and then increases.When the solution temperature is 1160℃,the particle size of the tertiaryγ'phase is the minimum.The unit area fraction and microhardness of the tertiaryγ'phase increased first and then decreased,and both reached the maximum value when the solution temperature is 1170℃.The change of grain size is related to the change of primaryγ'phase in the alloy,and the change of hardness of GH4710 alloy is related to the distribution of the tertiaryγ'phase in the alloy.The mechanism of the primaryγ'phase and tertiaryγ'phase in GH4710 alloy is clarified,it provides a theoretical basis for the regulation of the microstructure and properties of the alloy.

关 键 词：GH4710合金 固溶温度 γ’相 晶粒组织 显微硬度 

分 类 号：TG166.7[金属学及工艺—热处理]