TWIP钢薄板激光焊接接头的疲劳性能Investigation on fatigue property of TWIP steel joint by laser welding
陈剑波,卫英慧,马丽莉,侯利锋,郭春丽
摘要(Abstract):
对1mm厚的TWIP钢钢板及其激光焊接接头的静力学拉伸性能和疲劳性能进行了研究。结果表明,TWIP钢母材和激光焊接接头的抗拉强度分别为580 MPa和465 MPa,伸长率分别为63.5%和55%。循环次数为5×106时,母材和激光焊接接头对应的条件疲劳极限分别为211.1 MPa和119.1 MPa。显微观察表明TWIP钢母材疲劳裂纹起裂于试件的最小截面部位,而焊接接头的疲劳裂纹则起源于焊趾部位。疲劳扩展区和瞬断区分别含有疲劳辉纹、二次裂纹和韧窝,符合准解理断裂的特征。
关键词(KeyWords): TWIP钢;激光焊接;S-N曲线;疲劳性能
基金项目(Foundation): 国家自然科学基金(51001079,21201129);; 高等学校博士点专项科研基金(20091402110010);; 教育部中国博士后科学基金(20100471586);; 山西省自然科学基金(2011011020-2,2010021023-1)
作者(Author): 陈剑波,卫英慧,马丽莉,侯利锋,郭春丽
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