董现春,潘辉,赵阳,张永强,刘新垚

• 1:首钢集团有限公司技术研究院

摘要(Abstract)：

采用激光焊对SPRO500防弹钢板进行了焊接试验,测试了焊接接头的防弹性能、抗拉强度和维氏硬度,观察分析了接头的显微组织、位错及第二相粒子。结果表明:焊接接头的焊缝金属及淬火粗晶区为粗大的板条马氏体和片状马氏体的混合组织;淬火细晶区为细小的板条状马氏体和贝氏体混合组织;不完全淬火区为马氏体与铁素体的混合组织;回火区位于距焊缝中心4～10 mm处,回火区的马氏体发生分解,晶间析出了网状渗碳体,其硬度及冲击韧性比母材及焊缝中心明显降低,防弹性能不能满足要求。与母材相比,焊缝金属及淬火粗晶区第二相粒子粗化明显,尺寸为10 nm以下的第二相粒子数量减少,平均直径由6.25 nm分别提高至34.1 nm及20.97 nm,淬火细晶区、不完全淬火区和回火区的第二相粒子平均直径变化不大。

关键词(KeyWords)： 防弹钢板;激光焊;回火区软化;第二相粒子

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 董现春,潘辉,赵阳,张永强,刘新垚

DOI: 10.13289/j.issn.1009-6264.2019-0129

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