于继洋,魏明炜,王善林,柯黎明,陈玉华,涂文斌,徐睦忠,余沛垌

• 1:南昌航空大学高端装备极端制造技术江西省重点实验室
• 2:浙江巴顿焊接技术研究院
• 3:杭州汽轮动力集团股份有限公司

摘要(Abstract)：

12Cr12Mo马氏体不锈钢被广泛应用于燃气轮机叶片的制造,但其电子束焊接接头易出现组织和性能不均匀性问题。为此,研究了回火温度对12Cr12Mo马氏体不锈钢电子束焊接接头微观组织及力学性能的影响。结果表明:经高温回火热处理,焊缝中的脆硬马氏体转变为回火索氏体。随着回火温度从650℃升高到720℃,焊缝区大角度晶界含量呈先上升后下降趋势,回火温度为690℃时回火索氏体亚板条平均尺寸最小,为0.26μm。与未回火相比,690℃回火后焊缝与母材的抗拉强度差从563 MPa缩小到58.2 MPa,显微硬度差从148 HV0.2下降到22 HV0.2,接头抗拉强度达到了845.5 MPa。当回火温度高于690℃时,回火索氏体中的亚板条结构长大,碳化物发生粗化,导致接头的拉伸强度及显微硬度均呈下降趋势。

关键词(KeyWords)： 12Cr12Mo钢;电子束焊;回火温度;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 江西省自然科学基金(20232BAB204052,20232ACB204020);; 江西省航空构件成形与连接重点实验室开放基金(EL202103266);; 浙江省“尖兵”“领雁”研发攻关计划(2023C01244);; 江西省科技计划项目(20212AEI91004)

作者(Author): 于继洋,魏明炜,王善林,柯黎明,陈玉华,涂文斌,徐睦忠,余沛垌

DOI: 10.13289/j.issn.1009-6264.2024-0064

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