刘晟,付文俊,兰志宇,徐玉君,张赫,李子豪

• 1:郑州煤矿机械集团有限责任公司
• 2:中国机械总院集团哈尔滨焊接研究所有限公司

摘要(Abstract)：

研究了5种不同焊后热处理工艺(即：250℃×2 h、450℃×2 h、450℃×4 h、450℃×6 h、580℃×2 h)及超声冲击处理对Q690D钢十字接头的残余应力与疲劳寿命的影响。结果表明：当采用焊后热处理时，Q690D钢十字接头的残余应力的消除程度不同，焊缝与熔合线的残余应力差值存在差异，疲劳寿命的提升程度有限，相较焊态最大提升了55%;当采用超声冲击处理时，残余应力转变为压应力，接头的疲劳寿命提升明显，且具有较高的稳定性，相较焊态提升了116%;当残余应力较小且焊缝与熔合线的残余应力差值较小，或残余应力为压应力时，Q690D钢十字接头的疲劳寿命相对较高。

关键词(KeyWords)： Q690钢;十字接头;焊后热处理;超声冲击;残余应力;疲劳寿命

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 刘晟,付文俊,兰志宇,徐玉君,张赫,李子豪

DOI: 10.13289/j.issn.1009-6264.2024-0522

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