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厚壁12Cr1MoVG钢焊接接头裂纹分析及其控制

, PP. 137-143

Keywords: 12Cr1MoVG钢,厚壁件,焊接接头,焊后热处理,再热裂纹

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Abstract:

通过理化检验、电镜观察和有限元计算,研究厚壁12Cr1MoVG钢接头裂纹性质及其原因。结果表明,裂纹起裂于热影响区粗晶区,由粗晶区向细晶区扩展并终止于细晶区;裂纹区域可观察到宏观裂纹、微裂纹和空穴3种不同缺陷形貌。根据裂纹产生的时间、位置、过程和形貌特征,可以判断该裂纹为焊接再热裂纹。三通母材混晶组织降低接头塑性储备,焊后热处理温度场不合理使接头存在较高残余应力,是该裂纹产生的主要原因。对于厚壁12Cr1MoVG钢,优化热处理工艺以提高接头应力集中处材料临界塑性变形能力εc,工程中采取措施降低该处的塑性变形量εp,使εc?εp,以有效避免接头再热裂纹的产生。

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