Journal Published Online: 19 September 2017
Volume 6, Issue 1

Synthesis and Comparative Study on Intergranular Corrosion Characteristics of Stabilized 5A Grade Cast Duplex Stainless Steel

CODEN: MPCACD

Abstract

In this paper, stabilization using zirconium and niobium was investigated to reduce the effect of intergranular corrosion (IGC) in 5A grade cast duplex stainless steel. Computational thermodynamic software was used to determine the various heat treatment temperatures according to phase precipitation. Resistance to IGC was investigated by oxalic acid etch test and double-loop electrochemical potentiokinetic reactivation (DL-EPR) technique. The surface of the specimens was observed using optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffractometry to evaluate the presence of various intermetallic phases prone to IGC. Oxalic acid etch test response has indicated the susceptibility, whereas the DL-EPR test has provided the degree of sensitization. The results revealed that zirconium-stabilized samples are more susceptible to IGC compared to the niobium samples. Earlier formation of niobium compounds led to the reduction of intergranular attack in the niobium-stabilized samples.

Author Information

Aneesh Kumar, P.
Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappali, India
Kumaresh Babu, S. P.
Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappali, India
Shaji Varghese, Asish
Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappali, India
Pages: 12
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Details
Stock #: MPC20170029
ISSN: 2379-1365
DOI: 10.1520/MPC20170029