时效强化高镍Inconel-718合金低周疲劳性能及寿命预测  

Low-cycle fatigue properties and life prediction of aging strengthened high-nickel Inconel-718 alloy

作　　者：屈华鹏[1] 王留兵[2] 王东辉[2] 吴冰洁 冯翰秋 陈海涛[1] 许斌[2] 宋丹戎[2] 郎宇平[1] Qu Huapeng;Wang Liubing;Wang Donghui;Wu Bingjie;Feng Hanqiu;Chen Haitao;Xu Bin;Song Danrong;Lang Yuping(Institute of Special Steel,Central Iron and Steel Research Institute,Beijing 100081,China;Science and Technology on Reactor System Design Technology Laboratory,Nuclear power institute of China,Chengdu Sichuan 610200,China)

机构地区：[1]钢铁研究总院特殊钢研究所,北京100081 [2]中国核动力研究设计院核反应堆系统设计技术重点实验室,四川成都610200

出　　处：《金属热处理》2021年第7期1-6,共6页Heat Treatment of Metals

基　　金：国家重点研发计划(2016YFB0300202)。

摘　　要：研究了核反应堆弹簧材料用时效强化0Cr20Ni55Mo3Nb5Ti(Inconel-718)合金材料在350℃高温下的低周疲劳性能,并采用Manson-Coffin和郑修麟模型对加载应变水平和低周疲劳寿命之间关系进行了拟合计算和对比。结果表明:经过970℃×1 h空冷+720℃×8 h炉冷+620℃×8 h空冷热处理后,Inconel-718合金在350℃具有优异的低周疲劳性能。根据郑修麟关系式计算结果,其临界应变疲劳极限约为0.37%,在低于此应变水平条件下,其低周疲劳寿命高于10~7循环。Manson-Coffin模型由于不包含临界应变疲劳极限参数ε_0,导致其对较低应变水平的疲劳寿命预测精度较低。High-temperature low-cycle fatigue properties at 350℃of the aging-strengthened 0Cr20Ni55Mo3Nb5Ti(Inconel-718)alloy was researched.The relationship between strain level and fatigue life was calculated and compared based on Manson-Coffin and Zheng models.The test results show that excellent low-cycle properties are obtained in Inconel-718 alloy after 970℃×1 h,AC+720℃×8 h,FC+620℃×8 h,AC heat treatment.According to Zheng model,the critical strain limit is approximately 0.37%.The fatigue life is longer than 107 with strain levels lower than 0.37%.Without critical strain limit parameterε0,the fatigue life prediction accuracy of Manson-Coffin model is relatively lower,especially at low loaded strain condition.

关 键 词：时效强化 高镍Inconel-718合金 低周疲劳 疲劳寿命预测 

分 类 号：TG156.2[金属学及工艺—热处理]