李林平,梁军,赵雷,徐连勇

• 1:神华国华(北京)电力研究院有限公司电站高温材料微创寿命评估中心
• 2:天津大学材料科学与工程学院

摘要(Abstract)：

利用钨极氩弧焊(GTAW)和手工电弧焊(SMAW)工艺,选用E90S-G焊丝和E9015-G焊条为焊料,对G115/T92异种钢进行焊接,研究其焊接接头的显微组织及力学性能。结果表明:接头焊缝、热影响区及母材均为典型的回火马氏体组织,T92侧焊缝及熔合线附近分布有多边形的δ-铁素体,含量不高于0.3%。G115侧熔合区发现有较明显的W、Co、Mo、Cu元素稀释现象。显微硬度在紧邻焊缝的热影响区达到最大值,在不完全相变区(ICHAZ)达到最小值,且经过二次回火,母材硬度降低。接头室温及650℃高温强度与T92钢相当,低于G115钢;室温断口位于T92侧母材,高温断口位于T92侧不完全相变区。

关键词(KeyWords)： G115钢;T92钢;异种钢焊接接头;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(先进超超临界锅炉耐热材料应用性能研究)(2017YFB0305205)

作者(Author): 李林平,梁军,赵雷,徐连勇

DOI: 10.13289/j.issn.1009-6264.2018-0188

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