Stable growth model on fatigue crack propagation of low carbon martensitic steel 20CrMnTiH
XIAO Rui1,2,3，YANG Ming1,2,3
（1. The Materials Science and Metallurgy Engineering College， Guizhou University， Guiyang 550025， Guizhou，China 2. The National and Local Joint Engineering Laboratory for High-performance Metal Structure Materials and Advanced Manufacture Technology， Guiyang 550025， Guizhou， China 3. Guizhou Key Laboratory for Mechanical Behavior and Microstructure of Materials， Guiyang 550025， Guizhou， China）
Abstract：The relationship between quenching process and its effect on mechanical properties and fatigue crack growth rate （FCGR） in the low carbon martensitic 20CrMnTiH 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 20CrMnTiH steel which show an accurate prediction of crack growth rate at a stress ratio of 0.1.
2018, Vol. 53 
