元素Ni对低合金钢焊缝金属性能影响  

Influence of Nickel on the Mechanical Properties of Low Alloy Steel Weld Metal

作　　者：朱官朋 王亚彬 张文军 ZHU Guanpeng;WANG Yabin;ZHANG Wenjun(Luoyang Ship Material Research Institute,Luoyang 471023,China)

机构地区：[1]中国船舶集团公司第七二五研究所,河南洛阳471023

出　　处：《材料开发与应用》2020年第4期32-36,41,共6页Development and Application of Materials

基　　金：高技术船舶科研项目(MK160101)。

摘　　要：通过改变低合金钢用药芯焊丝中Ni的加入量,研究了Ni含量对熔敷金属力学性能的影响,并结合Thermal-Calc热力学软件对组织形貌进行了分析.结果表明,Ni的强化效果显著,随Ni含量的增加,熔敷金属拉伸强度Rm不断提升,但冲击韧性KV2不断下降.随Ni含量的增加,奥氏体转变温度逐渐降低,先共析铁素体PF含量减少,碳化物析出的数量及尺寸均有所增大,Ni含量增加至一定含量后,组织中形成M-A组元.大尺寸碳化物及M-A组元对韧性具有不利影响,随着M-A组元的粗化,熔敷金属冲击韧性KV2进一步下降.Here was studied the influence of Ni contents in the flux cored wires on microstructure and mechanical properties of deposited metals,and the microstructures were analyzed with the help of thermodynamics software Thermal-Calc.The result shows that Ni has a significantly strengthening effect and that with the increase of Ni content,the tensile strength increases while the impact toughness goes down gradually.With the increase of Ni content,the transformation temperature of austenite decreases gradually and the volume fraction of primary ferrite decreases and the amount and size of the precipitated coarsening carbides increase.When Ni content increases to some degree,M-A constituents appear.

关 键 词：NI 低合金钢 熔敷金属 力学性能 

分 类 号：TG422.3[金属学及工艺—焊接]