司广全,李太江,李巍,孙琦

• 1:华能国际电力股份有限公司
• 2:西安热工研究院有限公司

摘要(Abstract)：

为研究水电工程1 000 MPa等级超高强钢埋弧焊焊接接头的显微组织及力学性能特征，通过扫描电子显微镜表征了焊接接头不同区域的显微组织，通过拉伸试验、冲击试验和弯曲试验测定了焊接接头的力学性能。研究结果表明：打底焊道和填充焊道焊缝金属由柱状晶、树枝晶以及等轴晶组成，组织多为针状铁素体和少量粒状贝氏体；热影响区形成了多个典型区域，靠近熔合线沿厚度方向上分别出现了临界粗晶区和粗晶区；远离焊缝出现了细晶区和临界区，组织多为粒状贝氏体、M-A组元和板条马氏体；盖面焊道焊缝金属为典型的柱状晶，组织主要为针状铁素体；热影响区包含了粗晶区、细晶区、临界区和亚临界区，由于没有后续焊道，未形成临界粗晶区，组织主要为板条马氏体、粒状贝氏体及M-A组元；焊接接头的平均抗拉强度达到980 MPa等级，在焊缝区和热影响区–40℃低温冲击吸收能量分别为118.7、149.3J(T/4部位)和67.0、154.0J(T/2部位)，横向侧弯未出现裂纹。

关键词(KeyWords)： 埋弧焊焊接接头;扫描电镜;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 司广全,李太江,李巍,孙琦

DOI: 10.19666/j.rlfd.202404088

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