高温应变时效对P92钢高温低周疲劳性能的影响  

Influence of High Temperature Strain Aging on High Temperature Low-Cycle Fatigue Properties of P92 Steel

作　　者：赵丽 华晓春 马涛 张肖飞 王孝义[1] 饶思贤(指导)[1,2] ZHAO Li;HUA Xiaochun;MA Tao;ZHANG Xiaofei;WANG Xiaoyi;RAO Sixian(School of Mechanical Engineering,Anhui University of Technology,Maanshan 243032,China;Hefei General Machinery Research Institute,Hefei 230031,China)

机构地区：[1]安徽工业大学机械工程学院,马鞍山243032 [2]合肥通用机械研究院,合肥230031

出　　处：《机械工程材料》2021年第9期19-25,共7页Materials For Mechanical Engineering

基　　金：安徽省自然科学基金资助项目(1908085ME148);安徽省教育厅重大自然科学研究项目(KJ2016SD09);安徽工业大学优秀创新团队项目(000452)。

摘　　要：分别在应力与应变控制下对P92钢进行550℃高温低周疲劳试验,研究该钢在不同应变幅(0.2%~1.0%)和应力幅(280~350 MPa)下的疲劳行为;对P92钢进行不同预拉伸应变(0~4%)和温度(250~350℃)下的应变时效处理后,研究该钢的高温拉伸与低周疲劳性能。结果表明:在应变控制下,P92钢的应变与疲劳寿命关系符合Manson-Coffin方程,在低应变幅(低于0.7%)下P92钢出现先循环硬化后循环软化现象;在应力控制下,应变与疲劳寿命关系不遵循Manson-Coffin方程,高应力幅(350 MPa)下P92钢出现先循环硬化后循环软化现象;应变时效处理可提高P92钢的屈服强度,且高温拉伸曲线出现Portevin-Le Chatelier屈服效应;应变时效处理后P92钢在应力控制下的应变与寿命关系不遵循Manson-Coffin方程,且其低周疲劳寿命大幅降低。The fatigue behavior of P92 steel under different strain amplitudes(0.2%-1.0%)and stress amplitudes(280-350 MPa)was studied by high temperature low cycle fatigue tests at 550℃under stress and strain control,respectively.P92 steel was subjected to strain aging treatment at different prestrains(0-4%)and temperatures(250-350℃),and then the high temperature tensile and low cycle fatigue properties were studied.The results show that the relation between strain and fatigue life of P92 steel conformed to Manson-Coffin equation under strain control,and the phenomenon of cyclic hardening and then cyclic softening appeared in P92 steel at low strain amplitudes(below 0.7%).The relation between strain and fatigue life did not follow Manson-Coffin equation under stress control,and the phenomenon of cyclic hardening and then cyclic softening appeared in P92 steel under a high stress amplitude(350 MPa).The strain aging treatment could improve the yield strength of P92 steel,and the high temperature tensile curve showed a Porevin-Le Chatelier yield effect.The relation between strain and life of P92 steel after strain aging treatment under stress control did not follow Manson-Coffin equation,and the low cycle fatigue life greatly decreased.

关 键 词：P92钢 高温应变时效 低周疲劳寿命 屈服效应 

分 类 号：TG113[金属学及工艺—物理冶金]