李林平,杨茂鸿,杜晋峰,张峥

• 1:国家能源集团新能源技术研究院有限公司
• 2:东莞材料基因高等理工研究院
• 3:北京航空航天大学材料科学与工程学院

摘要(Abstract)：

选用ERNiCrCoMo-1为焊丝，利用钨极氩弧焊(GTAW)对Sanicro25/G115异种钢进行焊接。采用光学显微镜、扫描电镜、透射电镜和拉伸试验等研究了焊接接头的微观组织及力学性能。结果表明：焊缝、Sanicro25钢及其热影响区的微观组织均为奥氏体+析出相；G115钢及其热影响区组织为回火马氏体，G115钢母材仍保持规则的马氏体板条形态，板条平均宽度约为466 nm; G115钢侧细晶热影响区(FGHAZ)马氏体板条特征消失，形成位错密度较低的亚晶，M_(23)C_6相、MX相分别沿亚晶界、晶内分布；G115钢侧焊缝及熔合线附近未形成δ-铁素体。焊缝显微硬度为246 HV0.1,紧邻焊缝G115钢侧粗晶热影响区(CGHAZ)的硬度最高，FGHAZ的硬度最低；母材经历焊接热循环及焊后热处理，Sanicro25钢的硬度由230 HV0.1增至246 HV0.1,G115钢由263 HV0.1降至250 HV0.1。接头呈韧性断裂，室温强度、650℃高温屈服强度均高于母材标准下限值，断裂位置位于G115钢侧细晶热影响区。

关键词(KeyWords)： Sanicro25钢;G115钢;异种钢焊接接头;微观组织;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 李林平,杨茂鸿,杜晋峰,张峥

DOI: 10.13289/j.issn.1009-6264.2023-0155

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