TA2纯钛与1Cr18Ni9Ti不锈钢的扩散连接  

Diffusion bonding of TA2 pure titanium to 1Cr18Ni9Ti stainless steel

作　　者：刘贵铭 魏红梅[1] 何鹏[1] 林铁松[1] 冯吉才[1] 

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨150001

出　　处：《中国科技论文》2015年第10期1189-1192,共4页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20112302130005);国家自然科学基金资助项目(51275135;51474081)

摘　　要：为了研究连接温度对TA2纯钛与1Cr18Ni9Ti不锈钢扩散连接接头界面组织和强度的影响,在压力为15 MPa、保温时间为30min、连接温度为620~850℃的真空条件下,对TA2纯钛与1Cr18Ni9Ti不锈钢进行了直接扩散连接。结果表明：当连接温度≤620℃时,无法实现有效连接;当连接温度为640~660℃时,接头存在未焊合区域;当连接温度≥700℃时,在接头处形成厚度超过10μm的反应相,主要由α-Fe（Ti）/TiFe＋TiFe2＋TiCr2/β-Ti（Fe,Cr）/（α＋β）-Ti（Fe）组成。连接温度为620~850℃时,接头的抗剪强度为40~60 MPa,约为母材TA2纯钛抗剪强度的13%~20%。连接温度在620~850℃范围内时,连接温度对接头的抗剪强度影响不大,断裂主要发生于α-Fe（Ti）和β-Ti（Fe,Cr）之间,断口处存在大量解理,为脆性断裂,接头处生成脆性的TiCr2是导致接头性能恶化的主要原因。To investigate the effects of bonding temperature on interfacial microstructure and bonding strength of joints,the test of diffusion bonding between pure titanium（TA2）and stainless steel（1Cr18Ni9Ti）was carried out at 620 to 850 ℃for 30 min under 15 MPa uniaxial load in vacuum.The result shows that TA2 and 1Cr18Ni9Ti cannot be joined at 620 ℃ or less,and the joints are joined insufficiently with unbonded areas in them at 640-660 ℃.With the bonding temperature increasing to 700 ℃ or higher,a thick（more than 10μm）reaction layer is formed at joints,mainly composed ofα-Fe（Ti）,TiFe＋TiFe2＋TiCr2,β-Ti（Fe,Cr）and（α＋β）-Ti（Fe）.At 640-850 ℃,the shear strength of the bonded joints fluctuates between 40 and 60 MPa,where the bonding temperature has little effects on the shear strength.The fracture mainly occurs betweenα-Fe（Ti）andβ-Ti（Fe,Cr）,with many cleavages on the fracture surface,which indicates the fracture is brittle.The formation of TiCr2 at joints,which is brittle,is the main reason for the deterioration of its properties.

关 键 词：扩散连接 钛 不锈钢 界面 抗剪强度 

分 类 号：TG495[金属学及工艺—焊接]