Effect of diffu sion time on properties of Inconel 718 TLP diffusion welded joint

扩散时间对Inconel 718 TLP扩散焊接头性能影响 Effect of diffu sion time on properties of Inconel 718 TLP diffusion welded joint 邹志超 ZOU Zhichao 1 first-author 张小枫 ZHANG Xiaofeng 2 corresp arcxiaofeng@163.com 中国国家铁路集团有限公司沈阳安监特派办 中国国家铁路集团有限公司沈阳安监特派办 Chongqing Guanyu Battery Co.,Ltd. Chongqing Guanyu Battery Co.,Ltd. 重庆冠宇电池有限公司  重庆冠宇电池有限公司  Shenyang Safety Supervision Office of China National Railway Group Co.,Ltd. Shenyang Safety Supervision Office of China National Railway Group Co.,Ltd. 采用BNi2作中间层,在焊接温度1 100℃、焊接压力1 MPa的条件下,通过力学性能测试、界面微观组织观察及元素分布等分析,研究了扩散时间对Inconel 718高温合金瞬时液相扩散焊接头组织及性能的影响规律。研究表明:扩散时间的延长可以使中间层元素扩散更加充分,同时减弱扩散区域中析出物的聚集程度,增大接头的结合强度。扩散时间为120 min时接头剪切强度可达到511 MPa,较60 min提升了10.2%,较30 min接头剪切强度提升了22.9%。Inconel 718/BNi2 TLP接头显微硬度皆呈"M"型分布,即在扩散区域硬度值最高,等温凝固区域硬度值最低,母材显微硬度高于等温凝固区域。 The effect of diffusion time on the microstructure and properties of Inconel 718 superalloy transient liquid phase diffusion welded joints were studied by means of mechanical properties test,interface microstructure observation and element distribution analysis under welding temperature of 1100 ℃ and welding pressure of 1 MPa,using BNi2 as intermediate layer. The results show that the extension of diffusion time can make the intermediate layer elements diffuse more fully,weaken the aggregation degree of precipitates in the diffusion region and increase the joining strength of the joint. The shear strength of the joint reaches 511 MPa when the pressure is 1 MPa at 1100 ℃ for 120 min,and when the diffusion time is 120 min,the shear strength of the joint increases by 10.2% compared with 60 min and 22.9%compared with 30 min. The HV of Inconel 718/BNi2 TLP joint shows M-shaped distribution,that is,the HV in diffusion zone is the highest,and that in isothermal solidification zone is the lowest. The HV of base metal is higher than that in the isothermal solidification zone. Inconel718 TLP 焊接接头 剪切强度 Inconel718 TLP welded joint shear strength TG453.9 2022-03-08 8 51