GH4169合金的反常应力松弛行为  

Abnormal Stress Relaxation Behavior of GH4169 Alloy

作　　者：迟海[1,2] 郭霞 刘伟丽[1,2,3] 高峡 贺俊智[1,2] 秦海龙 王凯[4] 毕中南 CHI Hai;GUO Xia;LIU Weili;GAO Xia;HE Junzhi;QIN Hailong;WANG Kai;BI Zhongnan(Beijing Center for Physical and Chemical Analysis,Beijing 100094,China;Beijing Key Laboratory of Organic Materials Testing Technology & Quality Evaluation,Beijing 100094,China;Beijing Academy of Science and Technology Key Laboratory of Analysis and Testing Technology,Beijing 100089,China;High Temperature Materials Research Division,Central Iron &Steel Research Institute,Beijing 100081,China)

机构地区：[1]北京市理化分析测试中心,北京100094 [2]有机材料检测技术与质量评价北京市重点实验室,北京100094 [3]北京市科学技术研究院分析测试技术重点实验室,北京100089 [4]钢铁研究总院高温材料研究所,北京100081

出　　处：《机械工程材料》2019年第7期64-68,共5页Materials For Mechanical Engineering

基　　金：北京市市级财政项目(PXM2018_178305_000009)

摘　　要：对GH4169合金在500,620,720℃下进行了应力松弛、蠕变和热膨胀试验,结合显微组织观察研究了合金的应力松弛行为。结果表明:在500℃和620℃应力松弛试验过程中,GH4169合金的应力随时间的延长反常增大,在蠕变过程中表现为负蠕变应变,而在720℃下合金的应力松弛和蠕变行为均正常;在不同温度热膨胀试验过程中,GH4169合金均出现了收缩现象;γ″相析出使得γ基体的晶格常数减小,是导致GH4169合金在620℃下应力反常增大的主要原因。Stress relaxation,creep and thermal expansion tests at 500,620,720 ℃ were conducted on GH4169alloy,and then the stress relaxation behavior was studied by combination of microstructure observation. The results show that the stresses in the GH4169alloy increased abnormalloy with increasing time during stress relaxation tests at 500 ℃ and 620 ℃,and showed negative creep strains during creep.However,the stress relaxation behavior and creep behavior of the alloy were normal at 720℃.Shrinkage was observed in the GH4169 alloy during thermal expansion tests at different temperatures.The reduction of lattice parameter ofγmatrix, which was caused by the precipitation ofγ″phase,was the main reason for the abnormal increase of stresses in the GH4169alloy at 620℃.

关 键 词：GH4169合金 时效 应力松弛 蠕变 

分 类 号：TG115.5[金属学及工艺—物理冶金]