Ni对600MPa级高强钢焊缝组织和性能的影响

摘要

通过改变气保护药芯焊丝中Ni元素的添加量,研究Ni元素对600 MPa级高强钢焊缝组织和性能的影响.研究表明:当w(Ni)为1.0％时,焊缝组织为针状铁素体和粒状贝氏体,-20℃低温冲击韧性达到69J;随着w(Ni)的增加,焊缝金属强度逐渐提高,而韧性则先下降后上升.适当Ni元素有利于提高焊缝金属的低温韧性.%The effect of Ni on the microstructure and properties of 600 MPa grade high strength steel welds is studied by changing the amount of Ni element in the gas shielded flux cored wire.The results show that when the amount of Ni element is 1.0％,the microstructure of welds is acicular ferrite and granular bainite,and the low temperature impact toughness at-20 ℃ is 69 J.With the increase of Ni elements,the strength of weld metal enhances gradually,while toughness decreases at first and then increases.