Formation of eutectic carbides in Fe-Cr-Mo-C alloy during non-equilibrium crystallization

被引：75

作者：

Wieczerzak, K. ^{[1
]}

Bala, P. ^{[1
,2
]}

Stepien, M. ^{[2
]}

Cios, G. ^{[2
]}

Koziel, T. ^{[1
]}

机构：

[1] AGH Univ Sci & Technol, Fac Met Engn & Ind Comp Sci, Al A Mickiewicza 30, PL-30059 Krakow, Poland

[2] AGH Univ Sci & Technol, Acad Ctr Mat & Nanotechnol, Al A Mickiewicza 30, PL-30059 Krakow, Poland

来源：

MATERIALS & DESIGN | 2016年 / 94卷

关键词：

Fe-Cr-Mo-C; XRD; EDS; EBSD; Eutectic carbides; THERMAL FATIGUE CRACKING; DIE-CASTING DIES; HARDFACING ALLOYS; MICROSTRUCTURE; STEELS; IRON; SI; RESISTANCE; M7C3;

D O I：

10.1016/j.matdes.2016.01.028

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The aim of this study was to characterize the eutectic carbides formed in an as-cast hypoeutectic Fe-25Cr-5Mo-0.82C alloy and also to determine their formation sequence during non-equilibrium crystallization. The alloy was synthesized in an arc furnace filled with high purity argon atmosphere and re-cast in a water-cooled copper mould. Optical emission spectrometry, scanning electron microscopy (SEM) energy dispersive spectroscopy (EDS), electron back-scattered diffraction (EBSD) and X-ray diffraction (XRD) analysis were used in the characterization process. The experimental results were compared with the Thermo-Calc based thermodynamic calculations. The alloy consists of ferrite (Fe-Cr-Mo solid solution) and complex eutectic carbides with varying molybdenum and chromium contents. The eutectic M7C3 and M23C6 carbides formed in the interdendritic zones exhibit continuous and complex shapes. It was found that non-equilibrium crystallization promotes precipitation of carbides with greater carbon content such as M7C3 and M23C6 instead of M6C. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：61 / 68

页数：8

共 39 条

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