0Cr18Ni9钢腐蚀疲劳弯曲裂纹扩展行为研究  

Study on fatigue curved crack growth behaviors of 0Cr18Ni9 steel

作　　者：杨大鹏[1,2] 潘海洋[3] 赵耀[2] 

机构地区：[1]郑州职业技术学院机械工程系,河南郑州450121 [2]华中科技大学船舶与海洋工程学院,湖北武汉430074 [3]郑州职业技术学院城市轨道交通系,河南郑州450121

出　　处：《湖北大学学报（自然科学版）》2016年第1期41-45,62,共6页Journal of Hubei University：Natural Science

基　　金：国家自然科学基金重大研究计划项目(91016026);河南省基础与前沿技术研究计划项目(152300410003)资助

摘　　要：计算分析0Cr18Ni9钢的疲劳弯曲裂纹在NaCl水溶液腐蚀状态下与未腐蚀状态下的扩展速率与应力比R、加载频率f、应力强度因子的变化幅值、弯曲裂纹尖端张开位移变化幅值、弯曲裂纹尖端J积分变化幅值的关系.研究结果表明,随应力比R不断增大及加载频率f逐渐减小,0Cr18Ni9钢的疲劳弯曲裂纹在NaCl水溶液腐蚀状态下的扩展速率逐渐增大,其扩展速率增大的程度在裂纹扩展的第一阶段较明显,第二阶段有所减弱,第三阶段趋于平缓;在NaCl水溶液腐蚀状态下的疲劳断裂特性方面,线弹性疲劳弯曲裂纹与弹塑性疲劳弯曲裂纹与各影响因素的关系具有相似性.Relationships between fatigue curved crack growth tempo of 0Cr18Ni9 steel in NaCl water solution eroding environment or under the condition of non corrosion and stress ratio R、strain rate f、stress intensity factor amplitude of variation ΔK、curved crack tip opening displacement amplitude of variation、curved crack tip J integral amplitude of variationΔJhave been calculated and analyzed.It can be indicated from the findings that fatigue curved crack growth tempo of 0Cr18Ni9 steel in NaCl water solution eroding environment increase gradually as stress ratio Rincrease and strain rate fdecrease continuously.The extent of the growth tempo increase is comparatively sharp at the first stage of crack propagation,abating at the second stage,tend to be gentle at the third stage;The relationship between linearly elastic or elastic plastic fatigue curved crack and each influencing factor are similar in terms of fatigue fracture behaviors in NaCl water solution eroding environment.

关 键 词：0CR18NI9钢 腐蚀 疲劳弯曲裂纹 扩展速率 

分 类 号：TB301[一般工业技术—材料科学与工程]