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2 2种选区激光熔化(SLM) TC4合金的OM像

Fig.2 OM images of selective laser melting (SLM) TC4 alloy (a) SD specimen (laser power is 300 W, scanning speed is 1200 mm/s) (b) LD specimen (laser power is 250 W, scanning speed is 1400 mm/s)