应力比对含缺陷选区激光熔化TC4合金稳态疲劳裂纹扩展速率的影响

戚钊, 王斌, 张鹏, 刘睿, 张振军, 张哲峰

Effects of Stress Ratio on the Fatigue Crack Growth Rate Under Steady State of Selective Laser Melted TC4 Alloy with Defects

QI Zhao, WANG Bin, ZHANG Peng, LIU Rui, ZHANG Zhenjun, ZHANG Zhefeng

图9 2种疲劳裂纹扩展机制示意图

Fig.9 Schematics of blunting/re-sharpening (a1-a4) and microvoid coalescence (b1, b2) fatigue crack growth mechanisms (a1) tensile load (a2) maximum tensile load (a3) compress load (a4) zero load (b1) microvoid nucleation (b2) microvoid growth