Development of high strength stainless steel brazed joints using rapidly solidified filler alloys

Abstract

Two types of rapidly solidified filler alloys of nominal composition Cu–40Mn–10Ni (C50) and Ni–7Cr–3·2B–4·5Si–3Fe (N82) were used for stainless steel (SS304) brazing joints. The C50 foil is crystalline in nature, whereas N82 foil shows amorphous structure. The SS304/C50/SS304 joint shows solid solution phases at interfacial area, with maximum bond strength of 500 MPa, which qualifies to 80% of base metal strength. Conversely, the SS304/N82/SS304 joint develops brittle Cr_xB_y intermetallic phases, which lowers bond strength to 330 MPa.

Keywords:

• Brazing
• Bonding
• Electron probe micro analysis
• X-ray diffraction
• Intermetallics
• Solid solution phases

We express our thanks to the Director, CSIR-National Metallurgical Laboratory, Jamshedpur, for giving us permission to publish the work. This work is the part of the project funded by DST, Govt. of India.