TiZrCuNi钎料钎焊TA2钛接头的组织与性能  

Microstructure and Properties of TA2 Titanium Joints Brazed with TiZrCuNi Filler Metals

作　　者：王娜[1] 刘全明 肖俊峰[2] 龙伟民 杨海瑛[4] 高斯峰[2] WANG Na;LIU Quanming;XIAO Junfeng;LONG Weimin;YANG Haiying;GAO Sifeng(Shaanxi Vocational and Technical College,Xi'an 710100,China;Gas Turbine Technology Department,Xi'an Thermal Power Research Institute Co.,Ltd.,Xi'an 710054,China;State Key Laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,Zhengzhou 450001,China;Institute of Titanium Alloy Research,Northwest Institute for Nonferrous Metal Research,Xi'an 710016,China)

机构地区：[1]陕西职业技术学院,陕西西安710100 [2]西安热工研究院有限公司燃气轮机技术部,陕西西安710054 [3]郑州机械研究所有限公司新型钎焊材料与技术国家重点实验室,河南郑州450001 [4]西北有色金属研究院钛合金研究所,陕西西安710016

出　　处：《热加工工艺》2022年第23期136-139,144,共5页Hot Working Technology

基　　金：中国华能集团有限公司总部科技项目-华能国际电力股份有限公司科技项目(HNKJ20-H42);陕西省重点产业链项目(2020ZDLGY01-08)。

摘　　要：分别采用37.5Ti-37.5Zr-15Cu-10Ni非晶箔带和粉末钎料对TA2钛进行搭接钎焊试验,研究了两种钎料的熔化特性、组织及物相构成,钎焊界面结构、钎焊接头的拉剪性能。结果表明:非晶箔带固-液相线温度差值更小,能更好抑制界面脆性化合物的形成。粉末钎料组织由基体和多种晶体相构成,而非晶钎料组织未见明显晶粒。钎焊界面处Cu、Ni元素快速向基体扩散,Ti元素快速向钎料中扩散。在920℃/15 min下钎焊TA2钛时,使用非晶箔带钎料钎焊的接头界面脆化层和晶间渗入区厚度之和低于粉末钎料接头的,并且其元素互扩散相对更为充分。适当降低钎焊温度或缩短保温时间可减弱界面元素对基体的熔蚀。使用非晶箔带钎料钎焊的接头塑性稍优于粉末钎料接头的,但其拉剪强度更低,这是由于该接头界面脆化层更厚,产生更多的脆性化合物造成的。Lap brazing tests of TA2 titanium was carried out by using 37.5Ti-37.5Zr-15Cu-10Ni amorphous foil and powder filler metals, respectively. The melting properties, microstructure and phase composition of the filler metals,brazing interface structure and tensile-shear properties of the brazed joints were studied. The results show that the amorphous foil has smaller solid-liquidus temperature difference, which can better inhibit the formation of interfacial brittle compounds. The microstructure of the powder filler metal is composed of matrix and various crystal phases, while the microstructure of the amorphous foil filler metal has no obvious grains. At the brazing interface, Cu and Ni elements rapidly diffuse into the matrix, and Ti element rapidly diffuses into the filler metal. During brazing of TA2 titanium at 920℃ for 15 min, the thickness of the brittle layer and the intercrystal infiltration area of the joint with the amorphous foil is lower than that of the joint with the powder filler metal, and mutual diffusion of the elements is relatively more sufficient.Reducing the brazing temperature or shortening the holding time properly can weaken the erosion of the interface elements to the matrix. The plasticity of the joint with the amorphous foil is slightly better than that of the joint with the powder filler metal, while the tensile shear strength is lower. It is caused by thicker brittle layer at the interface of the joint, producing more brittle compounds.

关 键 词：钛基钎料 非晶箔带 熔化特性 微观组织 拉剪强度 

分 类 号：TG425.2[金属学及工艺—焊接]