钛合金与钢异种金属焊接界面的冶金结合机理研究  

Study on Metallurgical Bonding Mechanism of Dissimilar Metal Welding Interface Between Titanium Alloy and Steel

作　　者：程婉婷 Cheng Wanting(Jiangxi Xingang Construction Co.,Ltd.,Xinyu Jiangxi 338001,China)

机构地区：[1]江西新钢建设有限责任公司,江西新余338001

出　　处：《山西冶金》2024年第10期19-20,24,共3页Shanxi Metallurgy

摘　　要：系统研究了钛合金/不锈钢异种金属电子束焊接接头界面微观组织、元素分布、金属间化合物、力学性能及冶金结合机理。结果表明:焊接界面处形成2~5μm厚的过渡层,内部弥散分布TiFe和TiFe_(2)金属间化合物;界面处Ti、Fe元素发生明显互扩散;接头抗拉强度达302 MPa,约为钛合金母材的85%;界面过渡层硬度(HV0.2)最高达650,明显高于母材。界面冶金结合机理研究揭示,焊接过程中界面处元素快速互扩散并生成适量金属间化合物是实现可靠冶金结合的关键。过量金属间化合物会降低接头塑韧性。优化焊接工艺参数可有效调控金属间化合物生成,获得高强韧性焊接接头。The microstructure,element distribution,intermetallic compounds,mechanical properties,and metallurgical bonding mechanism of the interface of titanium alloy/stainless steel dissimilar metal electron beam welding joints were systematically studied.The results indicate that a transition layer with a thickness of 2~5μm is formed at the welding interface,and TiFe and TiFe2 intermetallic compounds are dispersed internally.Significant interdiffusion of Ti and Fe elements occurs at the interface.The tensile strength of the joint reaches 302 MPa,which is about 85%of the titanium alloy base material.The hardness of the interface transition layer(HV0.2)can reach up to 650,significantly higher than that of the base material.The study of interface metallurgical bonding mechanism reveals that rapid interdiffusion of elements at the interface during welding and the generation of appropriate intermetallic compounds are key to achieving reliable metallurgical bonding.Excessive intermetallic compounds can reduce the ductility of joints.Optimizing welding process parameters can effectively regulate the formation of intermetallic compounds and obtain high-strength and toughness welded joints.

关 键 词：钛合金 钢 异种金属焊接 冶金结合 界面 金属间化合物 

分 类 号：TG406[金属学及工艺—焊接]