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Effects of Heat Treatment and Surface Finish on the Crevice Corrosion Resistance of Martensitic Stainless Steel

Fatima Sameer Ahmed فاطمة صبيح احمد --- Haider M. Mohammad حيدر معاذ محمد

Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية
ISSN: Print: 18146120; Online: 23118385 Year: 2017 Volume: 17 Issue: 2 Pages: 9-17
Publisher: Basrah University جامعة البصرة

Abstract

The present study aims to investigate the influence ofheat treatment and surface finish on the behavior of crevicecorrosion resistance of AISI 410 and 416 martensitic stainlesssteels thus, to quantify the conditions at which crevicecorrosion minimize as possible. The experimental work carriedout during this study involves material selection, chemicalcomposition tests, specimens preparation before heattreatments, austenitizing at temperature range (925-1010˚C)and for holding time periods of (30, 45 and 90 min), air and oilquenching followed by tempering at heating range of (205-605 ̊C) and for 45 min, micro hardness tests, specimensgrinding, surface roughness measurements, crevice corrosiontests, crevice evaluation and microstructure tests.Theoretically, empirical equations for crevice maximum depthunder the effect of surface roughness and hardness for bothAISI 410 and 416 steels were determined. While formicrostructure analysis, carbides average area was determinedby using the ImageJ analysis program and a mathematicalmodel was also predicted. Results showed that like hardness andsurface roughness increase crevice corrosion resistancedecreases. Therefore, material treated by annealing canminimize crevice corrosion rates more than that treated withhardening.

Keywords

Austenitizing --- Crevice --- Corrosion --- Carbides --- Hardness --- Roughness --- Tempering