预应变下焊接接头冲击韧度及韧-脆转变的分析
Effect of prestrain on impact toughness and ductile-brittle transition temperature of welded joint
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摘要: 以常用建筑结构钢(16Mn和Q235B)为研究对象,通过不同温度下的夏比冲击试验研究预应变对其母材和焊缝冲击性能的影响。结果表明,材料在预应变下无论是母材还是焊缝夏比冲击韧度均有所降低,韧-脆转变温度有所提高。5%预应变后的16Mn母材和焊缝其韧-脆转变温度均低于室温(20℃),因此仍可在室温下安全使用;Q235B钢室温下冲击韧度较16Mn钢低,且预应变对母材影响更大,和未经预应变冲击值相比,降低了三倍有余。可以看出,Q235B钢的抗震性能较16Mn差。研究发现:为建立客观的材料韧度指标和进行更有效的安全分析时,预应变也应该作为一个考虑因素。Abstract: The effects of prestrain on the impact toughness of base metal and weld metal of structural steels (16Mn and Q235B steel) were investigated experimentally by use of the Charpy notch impact test at different testing temperatures.The results of the tests show that:for 16Mn and Q235B steel,the impact toughness of both base metal and weld metal decreases with decreasing temperature and the ductile-brittle transition temperature of the two kinds of material increases a little under prestrain.The range of ductile-brittle transition temperature of the base metal and weld metal of 16Mn steel under 5% prestrain is lower than the room temperature (20℃),at which it can be used safely.The impact toughness of Q235B steel is poorer than that of 16Mn under prestrain condition at room temperature.Prestrain has great effect on the impact toughness of base metal.The fracture toughness of base metal of Q235B under prestrain decreases to one thirds of the toughness under none prestrain.All of the results show that the resistance to fracture of Q235B steel under earthquake condition is rather poor.From the research in this paper,the conclude can be drawn that the prestraining effect should be considered when establish objective toughness standard and carry out more effective safety analysis.
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Keywords:
- prestrain /
- impact toughness /
- ductile-brittle transition temperature /
- welded joint
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期刊类型引用(3)
1. 陈长新，李天庆，苏鑫，王昊. 氮气比例对金属粉末再压缩等离子弧焊接电弧电压和焊缝成形的影响. 精密成形工程. 2024(10): 217-224 . 
百度学术
2. 李天庆，张宇，王凯，韩振扬，雷玉成. 金属粉末再压缩等离子弧焊接工艺. 焊接学报. 2021(12): 62-66+90+100 . 本站查看
3. 李天庆，杨喜牟，雷玉成，陈璐. 气流再压缩等离子弧焊接工艺初步探究. 焊接学报. 2019(11): 28-32+162 . 本站查看
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