文献类型：期刊文献

中文题名：热处理对GH4169合金组织及650℃下低周疲劳性能的影响

英文题名：Effect of heat treatment on microstructure and low cycle fatigue performance of GH4169 alloy at 650℃

作者：丁天胜[1];张显程[1];涂善东[1];轩福贞[1]

机构：[1]华东理工大学机械与动力工程学院,承压系统与安全教育部重点实验室,上海200237

年份：2016

卷号：37

期号：4

起止页码：69

中文期刊名：材料热处理学报

外文期刊名：Transactions of Materials and Heat Treatment

收录：CSTPCD;;Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

基金：国家自然科学基金(51322510)

语种：中文

中文关键词：热处理;GH4169合金;δ相;高温低周疲劳

外文关键词：heat treatment;GH4169 alloy;δphase;high temperature low cycle fatigue

摘要：采用两种不同热处理工艺对GH4169合金进行处理,观察并研究了合金的显微组织变化以及在5个应变幅(1.2%、1.0%、0.8%、0.6%和0.5%)和650℃条件下δ相对合金低周疲劳性能的影响。结果表明:随着900℃保温时间的延长,合金δ相的析出量增加。合金在高应变幅(Δεt/2≥0.6%)下的疲劳寿命基本不受δ相含量变化的影响;而在较小应变幅下(Δεt/2=0.5%)的疲劳寿命则具有一定的分散性,并随着δ相含量的增加而增加;与此同时,合金的塑性应变-寿命曲线在常温下具有的双线性特征在650℃高温下却不再具有,而且疲劳断口在相同应变幅下呈现出相似的形貌,裂纹源数量也随着应变幅的增加而增加。
GH4169 alloy heat-treated using different processes was employed to investigate microstructure variation of the alloy and the effect ofδphase on low cycle fatigue property of the alloy under strain amplitudes of 1.2%,1.0%,0.8%,0.6%and 0.5%at 650℃.The results show that the amounts ofδphase of the alloy are increased as the extension of the holding time at 900℃.No significant influence of the amount ofδphase on fatigue life of the GH4169 alloy is observed under the high strain amplitude(Δεt/2≥0.6%),the fatigue lives of the alloy after the two different heat treatments used in this paper are basically the same.However,when the experiment performed at low strain amplitude(Δεt/2=0.5%),the fatigue lives show dispersive characteristics and increase with the increasing amount ofδphase.At the same time,the plastic stain amplitude-life curves of the alloy with bilinear feature at room temperature has not been found when the test temperature reached 650℃.Furthermore,the fatigue fracture at the same strain amplitude exhibits similar morphology,the number of crack sources observed from fatigue fracture surface increases with the increase of strain amplitude.