20CrMnTiH低碳马氏体钢疲劳裂纹稳态扩展模型  

Stable growth model on fatigue crack propagation of low carbon martensitic steel 20CrMnTiH

作　　者：肖瑞 杨明[1,2,3] 

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025 [2]高性能金属结构材料与制造技术国家地方联合工程实验室,贵州贵阳550025 [3]贵州省材料结构与强度重点实验室,贵州贵阳550025

出　　处：《钢铁》2018年第1期72-78,共7页Iron and Steel

基　　金：国家自然科学基金资助项目(51461006);贵州省重大应用基础研究资助项目(黔科合JZ字[2014]2003)

摘　　要：研究了不同淬火工艺对20CrMnTiH钢的力学性能和裂纹扩展速率的影响规律,通过测试获得了不同热处理状态下的力学性能指标和稳态扩展区的Paris裂纹扩展模型,其中当奥氏体化温度为1 100℃并采用冰盐水淬火时,该热处理状态下的组织具有最高的裂纹扩展阻力,裂纹扩展速率最慢。与此同时,基于拉伸性能建立了裂纹扩展的数学模型,该模型计算的20CrMnTiH钢在应力比R=0.1时的裂纹扩展速率与试验测试结果误差较小,具有较高的准确性。The relationship between quenching process and its effect on mechanical properties and fatigue crack growth rate（FCGR）in the low carbon martensitic 20 CrMnTiH steel was analyzed.The mechanical performances and crack propagation Paris models in steady growth region of different heat treatment were obtained by testing.The microstructures which heat to 1 100 ℃ austenitizing temperature and quenching in ice salt water exhibited high fatigue crack propagation resistances,the lowest FCG rates.Meanwhile,a generalized crack growth model based on tensile properties is established for 20 CrMnTiH steel which show an accurate prediction of crack growth rate at a stress ratio of 0.1.

关 键 词：低碳马氏体钢 淬火工艺 裂纹扩展速率 裂纹扩展模型 

分 类 号：TG142.1[一般工业技术—材料科学与工程]