Influence of interface microstructure on the mechanical properties of titanium/17-4 PH stainless steel solid state diffusion bonded joints |
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| Affiliation: | 1. College of Materials Science and Engineering, Xi''an University of Technology, Xi''an 710048, China;2. Baoji Petroleum Steel Pipe Co., Ltd., Baoji, Shaanxi 721008, China;1. School of Mechanical and Electrical Engineering, Xi''an University of Architecture and Technology, Xi''an 710055, China;2. State key laboratory of mechanical behavior for materials, Xi''an Jiaotong University, Xi''an 710049, China;3. Baoji Petroleum Steel Pipe Co., Ltd., Baoji, Shaanxi 721008, China;4. Xi''an Tianli Clad Metal Materials Co., Ltd., Xi''an 710201, China;1. School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China;2. Shandong Institute of Mechanical Design and Research, Jinan 250031, China;3. School of Materials Science and Engineering, Shandong University, Jinan 250061, China;4. Southwestern Institute of Physics, Chengdu 610041, China |
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| Abstract: | In the present study, titanium was diffusion bonded to a type 17-4 precipitation hardening stainless steel in vacuum at different temperatures and times. Bonded samples were characterized using light microscopy, scanning electron microscopy (SEM) and X-ray diffraction technique (XRD). The inter-diffusion of the chemical species across the diffusion interface was evaluated by electron probe microanalysis (EPMA). Up to 850 °C for 60 min, FeTi phase was formed at the diffusion interface; however, α-Fe + λ, χ, Fe2Ti and FeTi phases and their phase mixtures were formed above 850 °C for 60 min and at 900 °C for all bonding times. The maximum tensile strength of ～342.4 MPa and shear strength of ～260.3 MPa along with 12.8% elongation were obtained for the diffusion couple processed at 950 °C. The thicknesses of different reaction products at the bond interface play an important role in determining the mechanical properties of the joints. The residual stress of the bonded joints increases with the increases in bonding temperatures and times. |
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