吕万青,尉文超,吴志方,时捷,王毛球

• 1:武汉科技大学材料学部
• 2:钢铁研究总院有限公司特殊钢研究院

摘要(Abstract)：

利用气体保护焊对8 mm厚高碳当量(CE=1.3)的1500 MPa级超高强度钢板进行焊接,研究了焊丝类型(铁素体型、马氏体型和奥氏体型焊丝)对接头组织和性能的影响。结果表明:采用3种焊丝得到的焊接接头成形质量良好,无未熔合、气孔、裂纹等缺陷,焊缝区组织主要为马氏体、贝氏体和少量残留奥氏体;显微硬度表征结果表明,焊接接头热影响区存在软化现象,由母材的500 HV0.2降至350 HV0.2左右,接头的强度难以达到与母材等强,焊丝类型分别为铁素体型、马氏体型和奥氏体型时,接头的抗拉强度分别为(1310±6) MPa、(1347±6) MPa和(816±10) MPa,且拉伸后断裂主要发生在焊缝区;在冲击性能方面,3种焊丝的焊接试样在-40℃时的冲击韧性分别可达到25 J(铁素体型)、10 J(马氏体型)以及47 J(奥氏体型);同马氏体型和奥氏体型焊丝相比,采用铁素体型焊丝得到的焊接试样不仅具有较高的强度还拥有良好的低温冲击韧性,具有较好的综合性能。

关键词(KeyWords)： 超高强度钢;焊接;焊丝类型;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 吕万青,尉文超,吴志方,时捷,王毛球

DOI: 10.13289/j.issn.1009-6264.2024-0499

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