中国激光, 2020, 47 (5): 0502002, 网络出版: 2020-05-12   

热输入对Ti6Al4V/Inconel 718激光诱导钎焊接头组织和力学性能的影响 下载: 1043次

Effects of Heat Input on Microstructure and Mechanical Properties of Ti6Al4V/Inconel 718 Laser-Induced Brazing Joint
李伦坤 1,2高晓龙 1,2刘晶 1,2,*王小强 1,2
作者单位
1 宝鸡文理学院机械工程学院, 陕西 宝鸡 721016
2 陕西省机器人关键零部件先进制造与评估省市共建重点实验室, 陕西 宝鸡 721016
摘要
采用激光诱导共晶反应钎焊技术对Ti6Al4V和Inconel 718异种金属进行焊接,研究了不同热输入下制备的接头的微观组织和力学性能。结果表明:当热输入为48 J/mm时,铌中间层过度熔化,未能有效阻隔Ti6Al4V和Inconel 718的混合,接头中有大量的TixNiy金属间化合物生成,导致接头直接开裂;当热输入降低到40 J/mm时,全厚度未熔化铌中间层的存在成功阻碍了熔池中Ti6Al4V和Inconel 718的混合,并形成两个连接界面,即(Ti,Nb)熔化区界面和Nb/Inconel 718共晶反应钎焊界面,接头中未形成TixNiy金属间化合物且接头的抗拉强度达到了205 MPa;随着热输入进一步降低到34 J/mm时,低的Nb/Inconel 718界面温度导致共晶反应钎焊不能充分进行,形成了明显的未熔合缺陷,接头的抗拉强度仅为103 MPa。
Abstract
The Ti6Al4V and Inconel 718 dissimilar metals are welded using the continuous laser-induced eutectic reaction brazing technology. In this study, the influences of heat input on the microstructure and mechanical properties of the joints are systematically studied. The test results prove the formation of a large number of TixNiy intermetallic compounds in the fusion zone because of the excessive melting of the niobium interlayer at a heat input of 48 J/mm, resulting in the direct cracking of the joint. When the heat input is decreased to 40 J/mm, the unmelted Nb interlayer successfully inhabits the mixing of Ti6Al4V and Inconel 718 in the molten pool, preventing the formation of the TixNiy intermetallic compound in the joint. Further, two different metallurgical bonding interfaces, i.e., the (Ti, Nb) melting interface and the Nb/Inconel 718 eutectic reaction brazing interface, are obtained. Additionally, the (Ti, Nb) melting interface and the Nb/Inconel 718 bonding interface are separated by the unmelted Nb interlayer. The maximum strength of the joint is 205 MPa. However, an incomplete fusion defect can be observed at the Nb/Inconel 718 interface when the heat input is 34 J/mm, resulting in a tensile strength of 13 MPa.

李伦坤, 高晓龙, 刘晶, 王小强. 热输入对Ti6Al4V/Inconel 718激光诱导钎焊接头组织和力学性能的影响[J]. 中国激光, 2020, 47(5): 0502002. Lunkun Li, Xiaolong Gao, Jing Liu, Xiaoqiang Wang. Effects of Heat Input on Microstructure and Mechanical Properties of Ti6Al4V/Inconel 718 Laser-Induced Brazing Joint[J]. Chinese Journal of Lasers, 2020, 47(5): 0502002.

本文已被 1 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!