A. Tanrikulu, B. Farhang, Aditya Krishna Ganesh Ram, Hamidreza Hekmatjou, A. Amerinatanzi
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引用次数: 0
摘要
将镍钛形状记忆合金(SMA)与不锈钢(SS)连接在一起的高强度、轻质焊接技术的需求受到了广泛关注。镍钛/不锈钢异种接头在焊接过程中会产生脆性和不可避免的金属间成分(IMC),如 TiFe、TiFe2 和 FeNi。为解决这一难题,本研究探索了在镍钛与 SS 异种激光焊接过程中使用工程磁场的方法。磁场的存在显著提高了接头的抗拉强度(超过 452 兆帕),同时微观结构也有明显的不同。研究了磁场对微观结构的影响;材料表征显示了无脆性 IMC 的微观结构,以及凝固过程中晶粒生长机制从柱状生长到蜂窝状生长的变化。此外,断口分析还证明了接头处的韧性破坏模式。
Microstructure evaluation of magnetic field-assisted dissimilar laser welding of NiTi to stainless steel
Significant attention has been directed to the need for a strong and lightweight welding technology for joining the NiTi shape memory alloys (SMAs) to stainless steel (SS). Dissimilar NiTi/SS joints suffer from the brittle and inevitable intermetallic components (IMCs) like TiFe, TiFe2 and FeNi that are formed during the welding process. To tackle this challenge, this study explores the use of an engineered magnetic field during the dissimilar laser welding of NiTi to SS. The presence of a magnetic field delivered a remarkable improvement in tensile strength (over 452 MPa) of the joint with a notable difference in microstructure. The effect of the magnetic field on microstructure was investigated; material characterizations showed brittle IMC-free microstructure and a change in grain growth mechanism from columnar to cellular growth during the solidification. Further, fractography analysis proved a ductile failure mode at the joint.