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Physics of Metals and Metallography

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01-01-2020 | STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION

Structure and Surface Properties of Metastable Austenitic Steel Subjected to Liquid Carburizing at a Reduced Temperature

Authors: R. A. Savrai, P. A. Skorynina, A. V. Makarov, A. L. Osintseva

Published in: Physics of Metals and Metallography | Issue 1/2020

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Abstract

This work investigates the effect of liquid carburizing at 780°C on the structure, chemical and phase composition, microhardness, and surface roughness of corrosion-resistant austenitic chromium-nickel steel. The depth of the carburized layer has been determined to be about 2 mm. The steel structure at a distance of 0.15 mm from the surface consists of carbon-saturated austenite γ_C, α' martensite, and fine Cr₂₃C₆ chromium carbides located along austenitic grain boundaries. No carbides are observed in the grain body. There are austenite γ_C and chromium Cr₂₃C₆ carbides in the structure at a depth from 0.15 to 2 mm. The number and the size of carbides decrease with distance from the steel surface. Carburizing increased the microhardness of the steel surface by a factor of four (from 200 to 800 HV0.025) and the roughness parameter Ra to 1.35 μm.

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Title: Structure and Surface Properties of Metastable Austenitic Steel Subjected to Liquid Carburizing at a Reduced Temperature
Authors: R. A. Savrai
P. A. Skorynina
A. V. Makarov
A. L. Osintseva
Publication date: 01-01-2020
Publisher: Pleiades Publishing
Published in: Physics of Metals and Metallography / Issue 1/2020
Print ISSN: 0031-918X
Electronic ISSN: 1555-6190
DOI: https://doi.org/10.1134/S0031918X20010135

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