李勇,方一鸣,王万里,占先强,吴跃,汤文明

• 1:大唐锅炉压力容器检验中心有限公司
• 2:中国大唐集团科学技术研究总院有限公司华东电力试验研究院
• 3:合肥工业大学材料科学与工程学院

摘要(Abstract)：

针对P91钢焊接接头细晶区(FGHAZ)与部分相变区(ICHAZ)硬度偏低、易产生Ⅳ型裂纹的工程难题，首先在P91钢坡口表面堆焊一层6～8 mm厚的高强度P92钢，经1060℃正火+750℃回火中间热处理后，再采用常规P91钢焊接工艺制备焊接接头，开展有无P92堆焊层的P91钢焊接接头显微组织与力学性能的对比研究。结果表明：堆焊P92的P91钢焊接接头热影响区(HAZ)中的FGHAZ与ICHAZ位于P92堆焊层内，其显微硬度较无P92堆焊层的P91钢常规焊接接头提升约4.9%,有效抑制了软化区形成，显著提高了焊接接头的硬度均匀性；堆焊P92的P91钢焊接接头的硬度、冲击韧性与室温、高温拉伸力学性能均符合相关标准要求，且优于无P92堆焊层的P91钢常规焊接接头。

关键词(KeyWords)： P92钢;P91钢焊接接头;堆焊;热影响区;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 李勇,方一鸣,王万里,占先强,吴跃,汤文明

DOI: 10.13289/j.issn.1009-6264.2025-0095

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