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Licensed Unlicensed Requires Authentication Published by De Gruyter January 12, 2017

Precipitation behavior of carbides in high-carbon martensitic stainless steel

  • Qin-tian Zhu , Jing Li , Cheng-bin Shi , Wen-tao Yu , Chang-min Shi and Ji-hui Li

Abstract

A fundamental study on the precipitation behavior of carbides was carried out. Thermo-calc software, scanning electron microscopy, electron probe microanalysis, transmission electron microscopy, X-ray diffractometry and high-temperature confocal laser scanning microscopy were used to study the precipitation and transformation behaviors of carbides. Carbide precipitation was of a specific order. Primary carbides (M7C3) tended to be generated from liquid steel when the solid fraction reached 84 mol.%. Secondary carbides (M7C3) precipitated from austenite and can hardly transformed into M23C6 carbides with decreasing temperature in air. Primary carbides hardly changed once they were generated, whereas secondary carbides were sensitive to heat treatment and thermal deformation. Carbide precipitation had a certain effect on steel-matrix phase transitions. The segregation ability of carbon in liquid steel was 4.6 times greater that of chromium. A new method for controlling primary carbides is proposed.


*Correspondence address, Dr. Qin-tian Zhu, State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Haidian, 30 Xueyuan Road, Beijing, 100083, China, Tel.: +8615210603169, E-mail:

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Received: 2016-07-26
Accepted: 2016-10-11
Published Online: 2017-01-12
Published in Print: 2017-01-09

© 2017, Carl Hanser Verlag, München

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