Title: The effect of nitrogen solubility, heat treatment and hot forging on 0.15%N duplex stainless steels

Authors: P. Chandramohan, S.S. Mohamed Nazirudeen, R. Srivatsavan

Addresses: Department of Mechatronics Engineering, Sri Krishna College of Engineering and Technology, Coimbatore-641 008, India. ' Department of Metallurgy, PSG College of Technology, Coimbatore-641 004, India. ' Mechanical Sciences, Sri Krishna College of Engineering and Technology, Coimbatore-641 008, India

Abstract: Duplex stainless steels are gaining global importance because of the need for a high strength corrosion resistance material. Duplex stainless steels are a family of two phase ferritic austenitic stainless steels. Two grades of duplex stainless steels were produced in a conventional induction furnace. In the first part of this paper, heat treatment is concentrated in which specimens were solutionised at different temperatures starting from 1010° to 1140°C and characterised. Ferrite content variation and hardness variation was observed from different solutionising temperatures. In this study the relationship between heat treatment microstructure and their effects on mechanical properties were examined. Increased solutionising temperature has resulted in higher ferrite content with lower hardness.

Keywords: duplex stainless steels; ferrite content; stress corrosion resistance; SCC; solutionising; nitrogen solubility; heat treatment; hot forging; hardness variation; microstructure; mechanical properties.

DOI: 10.1504/IJMPT.2006.008884

International Journal of Materials and Product Technology, 2006 Vol.25 No.4, pp.281 - 296

Published online: 02 Feb 2006 *

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