Influence of Diffusion Bonding Pressure on Microstructural Features and Strength Performance of Dissimilar Ti6Al4V Alloy and AISI 304 Steel Joints using Copper Interlayer

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL
A. A, Rajakumar Selvarajan, Tushar Sonar, M. Ivanov
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引用次数: 1

Abstract

The joining of Ti6Al4V (Ti64) alloy and AISI 304 austenitic stainless steel (ASS 304) carries significant importance in aero-engines for turbine blade applications. However, it is difficult to join using fusion welding. The fusion welding of Ti64 alloy and ASS 304 steel promotes the evolution of various Fe-Cr-Ti and Fe-Ti intermetallics in weld zone owing to limited solid solubility of Fe, Cr, Ti, and Ni with each other. The evolution of these intermetallics deteriorates the strength properties of joints. Hence for joining Ti6Al4 alloy and ASS 304 steel, vacuum diffusion bonding (VBD) method is employed with thin Copper (Cu) foil as an interlayer. DB pressure extends a significant influence on microstructural evolution and strength of joints. So, for the feasibility of joining Ti alloy and ASS, the effect of DB pressure on microstructure and strength of joints is investigated. Results showed that the dissimilar joints of Ti64 alloy and ASS 304 steel developed using the DB pressure of 14 MPa exhibited greater lap shear strength (LSS) and bonding strength (BS) of 180 MPa and 268 MPa respectively. It is mostly related to improved joining interface coalescence and the development of the ideal bonding width with the least amount of embrittlement consequences. An increase in DB pressure increases the width of diffusion region which favors the development of detrimental intermetallics of Ti-Fe and curtails the strength of dissimilar joints.
扩散接合压力对异种Ti6Al4V合金和AISI 304钢铜中间层接头组织特征和强度性能的影响
Ti6Al4V (Ti64)合金与AISI 304奥氏体不锈钢(ASS 304)的结合在航空发动机涡轮叶片应用中具有重要意义。然而,用熔焊连接是困难的。Ti64合金与as304钢的熔焊,由于Fe、Cr、Ti和Ni之间的固溶性有限,促进了焊缝区各种Fe-Cr-Ti和Fe-Ti金属间化合物的析出。这些金属间化合物的演化使接头的强度性能恶化。因此,采用真空扩散焊(VBD)的方法将Ti6Al4合金与as304钢连接,并采用薄铜箔作为中间层。DB压力对接头的组织演化和强度有显著影响。因此,为了验证钛合金与ASS连接的可行性,研究了DB压力对接头组织和强度的影响。结果表明:DB压力为14 MPa时,Ti64合金与as304钢异种接头的搭接剪切强度(LSS)和结合强度(BS)分别达到180 MPa和268 MPa;这主要与改善连接界面的聚结和发展理想的结合宽度和最小的脆化后果有关。DB压力的增加增加了扩散区的宽度,有利于有害的Ti-Fe金属间化合物的发展,降低了异种接头的强度。
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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