Inconel 690镍基合金在不同环境下的超高周疲劳性能  

Ultra-high Cycle Fatigue Properties of Inconel 690 Nickel-Based Alloy in Different Environments

作　　者：彭文杰 王金龙 刘冬 吴圣川[4] 肖永茂 PENG Wenjie;WANG Jinlong;LIU Dong;WU Shengchuan;XIAO Yongmao(School of Mechanical and Electrical Engineering,Gongqing Institute of Science and Technology,Jiujiang 332020,China;Baosteel Central Research Institute,Wuhan 430080,China;Marine Engineering College,Dalian Maritime University,Dalian 116026,China;State Key Laboratory of Rail Transit Vehicle System,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]共青科技职业学院机电工程学院,九江332020 [2]宝钢股份中央研究院,武汉430080 [3]大连海事大学轮机工程学院,大连116026 [4]西南交通大学,轨道交通运载系统全国重点实验室,成都610031

出　　处：《机械工程材料》2025年第4期75-80,共6页Materials For Mechanical Engineering

基　　金：江西省教育厅科学技术研究项目(GJJ2409108);国家自然科学基金资助项目(52205515)。

摘　　要：在载荷频率20 kHz、应力比-1、应力幅305~350 MPa条件下对国产Inconel 690镍基合金进行室温空气环境、室温水环境以及350℃高温空气环境中的疲劳试验,研究了不同环境中该合金的超高周疲劳寿命以及疲劳断口特征。结果表明:Inconel 690镍基合金在不同环境中均发生超高周疲劳失效,在相同应力幅下,室温空气环境中的疲劳寿命最高,室温水环境中的次之,高温空气环境中的疲劳寿命最低;不同环境中合金的断裂类型均为解理断裂。在室温空气环境中,合金的高周疲劳失效类型包括内部疲劳失效和表面疲劳失效,裂纹源为单裂纹源;在室温水环境中,在水的弱腐蚀性和循环载荷的作用下,合金发生表面疲劳失效,疲劳裂纹源包括单裂纹源和多裂纹源;在高温空气环境中,由于合金强度降低和表面氧化,合金发生表面疲劳失效,裂纹源为单裂纹源。Fatigue tests were conducted on domestically produced Inconel 690 nickel-based alloy in room temperature air,room temperature water,and 350°C high temperature air environments under conditions of the loading frequency of 20 kHz,the stress ratio of−1,and the stress amplitude ranging from 305 MPa to 350 MPa.The ultrahigh cycle fatigue life and fatigue fracture characteristics of the alloy in different environments were studied.The results show that Inconel 690 nickel-based alloy had ultrahigh cycle fatigue failure in different environments.At the same stress amplitude,the fatigue life was the highest in room temperature air environment,followed by in the room temperature water environment,and the fatigue life was the lowest in high temperature air environment.The fracture mode of the alloy in all environments was cleavage fracture.In room temperature air environment,the high-cycle fatigue failure modes of the alloy included internal fatigue failure and surface fatigue failure with single crack initiation.In room temperature water environment,due to the effect of the mild corrosivity of water and cyclic loading,surface fatigue failure of the alloy occurred with either single or multiple crack sources.In high temperature air environment,due to the alloy strength reduction and surface oxidation,surface fatigue failure occurred with single crack initiation.

关 键 词：超高周疲劳性能 Inconel 690镍基合金 试验环境 断口特征 

分 类 号：V263[航空宇航科学与技术—航空宇航制造工程]