不同热输入下基于MCJNi1K焊丝的Q460E钢埋弧焊缝组织性能研究  

Study on Microstructure and Properties of Q460E Steel Submerged Arc Weld Based on MCJNi1K Welding Wire under Different Heat Inputs

作　　者：胡嘉昊 杜学铭[1] 韩海峰 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《热加工工艺》2017年第21期173-175,180,共4页Hot Working Technology

摘　　要：使用自主研制的MCJNi1K低碳中锰高硅焊丝对Q460E低合金高强钢进行埋弧焊接试验,对不同热输入条件下焊缝金属的组织和性能进行了研究。结果表明,在一定的范围内随热输入增大,焊缝金属低温冲击韧性先增大再降低。当热输入为21.92 k J/cm时,低温冲击韧性最高,焊缝区随组织主要为针状铁素体,断口有韧窝特征。热输入较小或较大时,焊缝区分别有先共析铁素体和魏氏组织产生,均会降低低温冲击韧性。The submerged arc welding tests of Q460E low alloy high strength steel were carried out by using the independent developed low carbon, medium manganese and high silicon wire MCJNilK, and the microstructure and properties of weld metal under different heat inputs were investigated. The results show that with the increase of the heat input in a certain range, the low temperature impact toughness of the weld metal increases firstly and then decreases. When the heat input is 21.92 KJ/cm, the low temperature impact toughness is the highest. The microstructure of weld zone is mainly acicular ferrite, and the fracture shows characteristic of dimple fracture. When the heat input is smaller or larger, the mircostructure of weld zone has proeutectoid ferr/te or widmanstatten structure respectively, which decrease the low temperature impact tougmess.

关 键 词：低合金高强钢 中锰高硅焊丝 热输入 冲击韧性 

分 类 号：TG407[金属学及工艺—焊接]