Effect of a High Temperature Brazing Thermal Cycle on the Microstructure and Mechanical Properties of Fe–Cr–Mn–Ni–C Stainless Steel

This study investigates the effect of a brazing thermal cycle on the microstructure and mechanical properties of Fe–Cr–Mn–Ni–C stainless steel using microstructural examination, X-ray diffraction, ferrite content, hardness, impact, and tensile testing. Stainless steel was exposed to a high-temperatu...

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Bibliographic Details
Published in:Metallography, microstructure, and analysis microstructure, and analysis, 2023-06, Vol.12 (3), p.476-486
Main Authors: Krishna, S. Chenna, Venkateswaran, T., Rao, Gundi Sudarsana, Manwatkar, Sushant K., Muneshwar, Pravin, Govind, B., Narayanan, P. Ramesh, Mohan, M.
Format: Article
Language:English
Subjects:
Brazing
Characterization and Evaluation of Materials
Chemistry and Materials Science
Chromium
Cooling
Cooling rate
Ferrite
High temperature
Impact strength
Iron
Manganese
Materials Science
Mechanical properties
Metallic Materials
Microstructure
Nanotechnology
Nickel
Peer-Reviewed Paper
Sigma phase
Solution heat treatment
Stainless steel
Stainless steels
Structural Materials
Surfaces and Interfaces
Tensile tests
Thin Films
Water quenching
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Summary:This study investigates the effect of a brazing thermal cycle on the microstructure and mechanical properties of Fe–Cr–Mn–Ni–C stainless steel using microstructural examination, X-ray diffraction, ferrite content, hardness, impact, and tensile testing. Stainless steel was exposed to a high-temperature brazing thermal cycle of 1180 °C for 20 min, followed by different cooling practices, including furnace, air, and water quenching. The microstructure of the as-received steel mainly comprised austenite, ferrite, sigma phase, and carbides. Air and furnace cooling resulted in the formation of a sigma phase by decomposition of the ferrite phase. The amount of sigma phase varied depending on the cooling rate, which in turn influenced the mechanical properties. Water-quenched specimens were free from the sigma phase, while furnace-cooled specimens had a sigma phase of 9%. In other conditions, the sigma phase was in the range of 2.5–4%. Furnace-cooled specimens with higher sigma phase exhibited lower tensile ductility and impact strength compared to other conditions due to the brittle nature of the sigma phase. Re-solution treatment of furnace-cooled specimens at 1050 °C reduced the sigma phase and restored the mechanical properties.
ISSN:2192-9262
2192-9270
DOI:10.1007/s13632-023-00963-1