Effect of intermetallic compounds on heat resistance of hot roll bonded titanium alloy–stainless steel transition joint

• Published in: Transactions of Nonferrous Metals Society of China Vol. 23; no. 7; pp. 1966 - 1970
• Main Authors: ZHAO, Dong-sheng, YAN, Jiu-chun, LIU, Yu-jun
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-07-2013
• Subjects: Alloy steels; heat resistance; heat treatment; hot roll bonding; Intermetallics; Microcracks; Nickel; Rolls; stainless steel; Thermal resistance; titanium alloy; Titanium base alloys; transition joint; Transition joints; intermetallics; transition joint; stainless steel; titanium alloy; heat treatment; hot roll bonding; heat resistance
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(13)62684-9

The effect of intermetallic compounds on the heat resistance of transition joint was investigated. The experiment of post-weld heat treatment for the hot roll bonded titanium alloy–stainless steel joint using nickels interlayer was carried out, and the interface microstructure evolution due to heat treatment was presented. There was not found significant interdiffusion at stainless steel/nickel interface, when the specimens were heat treated in the temperature range of 600–800 °C for 10 and 30 min, while micro-cracks occurred at the stainless steel/nickel interface heat treated at 700 °C for 30 min. The thickness of intermetallic layers at nickel/titanium alloy interface increased at 600 °C, and micro-cracks occurred at 700 and 800 °C. The micro-cracks occurred between intermetallic layers or between intermetallic layer and nickel interlayer as well. The tensile strength of the transition joint decreased with the increase of heat treatment temperature or holding time.