熔体过热处理工艺对GH4169合金组织和力学性能的影响  

Effect of melt superheat treatment on microstructure and mechanical properties of GH4169 alloy

作　　者：郭晓凡[1] 寇生中[1] 蒲永亮[1] 曲红霞[1] 董天文[1] 张志栋[1] 

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《金属功能材料》2015年第6期29-33,共5页Metallic Functional Materials

基　　金：国家重点基础研究发展计划(2012CB722800)

摘　　要：选用光学显微镜、扫描电镜和电子万能试验机研究了不同熔体过热处理对GH4169合金组织和力学性能的影响。结果表明:熔体过热处理后,合金组织形貌规整,γ+Laves共晶团、有害Laves相析出数量减少,分布均匀;合金室温综合力学性能显著提高,存在最佳过热温度,此时Rm最大值为721 MPa,约是过热处理前的1.5倍;GH4169合金的硬度降低,存在最小值为10.15HRC,与过热处理前相比,降低26.7%;Nb、Mo元素偏析显著降低。The effect of melt superheat treatment on microstructure and mechanical properties of GH4169 alloy were investigated by using the optical,scanning electron microscope and electronic universal testing machine.The results showed that the microstructure morphology of GH4169 alloy is neat,uniform distribution after the melt superheat treatment.The number ofγ＋ Laves eutectic group and fewer harmful Laves phase are decreased.The comprehensive mechanical properties at room temperature of alloy are significantly improved.The Rm（721 MPa）is about 1.5times in front of the overheating at the best overheating temperature.The hardness of GH4169 alloy was reduce,there is the minimum 10.15 HRC,compared with the overheating before processing,reduced by 26.7%;Nb and Mo element segregation significantly reduced.

关 键 词：熔体过热处理 GH4169合金 树枝晶 力学性能 

分 类 号：TG156[金属学及工艺—热处理] TG146.15[金属学及工艺—金属学]