环境条件对轨道车辆用不锈钢激光焊接接头疲劳强度的影响
Hot Working Technology(2020)
Abstract
采用成组法和升降法,对板厚0.8mm的SUS301L-DLT与板厚2mm的EN1.4318+2G轨道车辆用不锈钢激光搭接焊接头分别在室温空气环境、-40℃低温空气环境和3.5%NaCl水溶液环境中进行剪切拉伸疲劳试验,绘制S-N曲线并进行断口形貌分析.试验结果表明:在循环寿命为1×107条件下,与空气环境相比,-40℃低温环境下不锈钢激光搭接焊接头的剪切拉伸疲劳强度提高57.8%,而在3.5%NaCl水溶液中接头疲劳强度降低25.5%.激光焊接头的疲劳裂纹均起始于搭接下板内侧靠近焊缝应力集中处,沿下板厚度方向扩展直至断裂,其中在瞬时断裂区存在大量韧窝,呈韧性断裂特征.
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