热轧D级船用钢板焊接接头的力学性能与显微组织

采用CO2气体保护焊法对16mm厚的热轧态D级船用钢板进行焊接,通过拉伸、冲击和金相检验等试验方法对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YCJ501-1焊材对D级船用钢板进行焊接时,接头具有较高的抗拉强度和较好的低温冲击韧性;焊缝组织主要为针状铁素体、先共析铁素体和少量粒状贝氏体;热影响区组织主要为铁素体、珠光体和少量针状铁素体,针状铁素体的存在是接头具有良好力学性能的主要原因。

Mechanical Properties and Microstructures of the Weld Joints of Hot-rolled D Shipbuilding Steel Plate

Mechanical properties and microstructures of hot-rolled D shipbuilding steel plate welded joints by CO2 welding were studied by means of tensile,impact and metallographic test. The results showed that the joints of D shipbuilding steel welded with wire YCJ501-1 had high tensile strength and toughness at low temperature. Microstructures of the welded seam mainly contain acicular ferrite,pro-eutectoid ferrite and a little granular bainite,the heat-affected zone mainly contains ferrite,pearlite and a little acicular ferrite. Acicular ferrite is the mainly reason that the joints had high mechanical properties.