Precipitation behavior of carbides in high-carbon martensitic stainless steel

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 preci...

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Bibliographic Details
Published inInternational journal of materials research Vol. 108; no. 1; pp. 20 - 28
Main Authors Zhu, Qin-tian, Li, Jing, Shi, Cheng-bin, Yu, Wen-tao, Shi, Chang-min, Li, Ji-hui
Format Journal Article
LanguageEnglish
Published De Gruyter 01.01.2017
Subjects
Carbides
Carbon
Computer programs
Electron probes
Liquids
Martensitic stainless steel
Microstructure
Phase transition
Precipitation behavior
Segregations
Steels
Transformations
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Summary: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.
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ISSN:1862-5282
2195-8556
DOI:10.3139/146.111447