S355J2W+N耐候钢焊接接头的组织和力学性能
Microstructures and Mechanical Properties of S355J2W+N Weathering Steel Welded Joints
卢峰华 ，许鸿吉，郭伟，郭丽娟，王德宝
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作者单位：唐山轨道客车有限责任公司，大连交通大学 材料科学与工程学院，唐山轨道客车有限责任公司，唐山轨道客车有限责任公司，唐山轨道客车有限责任公司
中文关键字：S355J2W+N耐候钢；焊接接头；力学性能；显微组织
英文关键字：S355J2W+N weathering steel; welded joint; mechanical properties; microstructure
中文摘要：S355J2W+N耐候钢是制造高速列车转向架构架的主要钢种，本文通过拉伸、冲击、弯曲、硬度和金相等试验方法对S355J2W+N耐候钢MAG焊焊接接头的力学性能与显微组织进行了研究。结果表明：采用G42 4 G3Si1焊丝对S355J2W+N耐候钢进行焊接时，接头具有良好的抗拉强度、弯曲性能和低温冲击韧性；焊缝组织为主要为先共析铁素体，晶内为针状铁素体和珠光体，局部有一定量的粒状贝氏体；热影响区组织主要为先共析铁素体和针状铁素体，同时存在少量的珠光体和贝氏体；母材为铁素体和珠光体。
英文摘要：S355J2W+N weathering steel is the main material producing high-speed bogie frame. In this paper, by using tensile, bending, impact, hardness and metallographic test methods, the mechanical properties and microstructures of S355J2W+N weathering steel welded joint were studied. Results showed that, the joints of S355J2W+N weathering steel with wire G42 4 G3Si1 had fine strength, flexural properties and low-temperature mechanical properties. The microstructure in welded seam mainly contains pro-eutectoid ferrite appeared along the grain boundaries, acicular ferrite and pearlite appeared within the grains， some granular bainite distributes at certain locations; microstructure in the heat-affected zone mainly contains pro-eutectoid ferrite, acicular ferrite, a little pearlite and bainite; the base metal contains ferrite and pearlite.