CAJ | 학술논문

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30 min、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 M Pa ，约为母材T A2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T iC r2是导致接头性能恶化的主要原因。
위료연구련접온도대TA2순태여1Cr18Ni9Ti불수강확산련접접두계면조직화강도적영향，재압력위15 MPa、보온시간위30 min、련접온도위620～850℃적진공조건하，대TA2순태여1Cr18Ni9Ti불수강진행료직접확산련접。결과표명：당련접온도≤620℃시，무법실현유효련접；당련접온도위640～660℃시，접두존재미한합구역；당련접온도≥700℃시，재접두처형성후도초과10μm적반응상，주요유α‐Fe（Ti）／TiFe＋ TiFe2＋ TiCr2／β‐Ti（Fe ，Cr）／（α＋β）‐Ti（Fe）조성。련접온도위620～850℃시，접두적항전강도위40～60 M Pa ，약위모재T A2순태항전강도적13％～20％。련접온도재620～850℃범위내시，련접온도대접두적항전강도영향불대，단렬주요발생우α‐Fe（Ti）화β‐Ti（Fe ，Cr）지간，단구처존재대량해리，위취성단렬，접두처생성취성적T iC r2시도치접두성능악화적주요원인。
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 10 μm) reaction layer is formed at joints ,mainly composed of α‐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 .