MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Microstructural Evolution during Austenitization and Quenching of a 5% Cr Work Roll
Minwoo KangMinsu JungHyongjik LeeYoung-Kook Lee
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2012 Volume 53 Issue 11 Pages 1915-1921

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Abstract

The effects of a slow heating rate and a long austenitizing time with various cooling rates on the carbide dissolution and phase transformations of a 5% Cr work roll steel was investigated based on actual austenitization and quenching conditions and a large roll size using transmission and scanning electron microscopy, dilatometry, and thermodynamic calculations. When the roll temperature reached the austenitization temperature of 1173 K, the dissolution of pre-existing carbides was nearly complete due to the slow heating rate of 100 K/h, indicating that the austenite matrix had an equilibrium chemical composition at 1173 K before quenching. After quenching at cooling rates ranging from 0.1 to 3.0 K·s−1 along the radial direction of the roll, the core of the roll contained ferrite, pearlite, bainite and undissolved carbides, while the surface consisted of martensite and undissolved carbides.

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© 2012 The Japan Institute of Metals and Materials
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