Brazing Oxide Dispersion-Strengthened Fe-Based Steels with a Cu-Based Filler Metal
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In a search for a high-performance joint, a Cu-based filler was developed to braze MGH956 alloy (Fe-20Cr-5Al-0.5Ti-0.5Y2O3, wt.%), and a reliable joint was obtained by assembly and welding under a high-purity argon atmosphere. The optimal joint was obtained by brazing at 1050 °C for 20 min. The microstructure, microhardness and tensile strength were investigated. The microhardness distribution across the joint was evaluated. The tensile strength of the joint mainly decreased linearly with an increase in test temperature in the range of room temperature (RT) to 700 °C. An interesting phenomenon was found: The joint strength at RT was 557.8 MPa and reached approximately 75% of the value of the base material. However, at 500 °C, the joint (428.7 MPa) achieved 95% of the strength of the base material (450.7 MPa). The fractography of a specimen tensile-tested at 500 °C indicates a higher percentage of intergranular fracture than that at RT.
Keywordsbrazing Cu-based filler MGH956 alloy oxide dispersion-strengthened alloy
This topic of research was financed by the Research Project of Special Furnishment and Part (Grant No. XZJQ-B1120680), the Technology Program of Southern Power Grid Corporation (Grant No. GDKJ00000081) and the Research Foundation of State Key Laboratory of Advanced Welding and Joining (Grant No. AWJ-Z14-02).
Conflict of Interest
The authors declare that they have no conflict of interest.
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