The effects of annealing temperature and cooling rate on carbide precipitation behavior in H13 hot-work tool steel

被引:75
作者
Kang, Minwoo [1 ]
Park, Gyujin [1 ]
Jung, Jae-Gil [1 ,2 ]
Kim, Byung-Hoon [3 ]
Lee, Young-Kook [1 ]
机构
[1] Yonsei Univ, Dept Mat Sci & Engn, Seoul 120749, South Korea
[2] Korea Inst Mat Sci, Light Met Div, Chang Won 642831, South Korea
[3] Doosan Heavy Ind & Construct, Chang Won 642792, Gyeongnam, South Korea
关键词
Metals and alloys; Precipitation; Phase transitions; Phase diagrams; Microstructure; MECHANICAL-PROPERTIES; FRACTURE-TOUGHNESS; MARTENSITIC STEELS; SILICON; ALLOYS; SYSTEM; MO;
D O I
10.1016/j.jallcom.2014.11.189
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The precipitation behavior of H13 hot-work tool steel was investigated as a function of both annealing temperature and cooling rate through thermodynamic calculations and microstructural analyses using transmission and scanning electron microscope and a dilatometer. The V-rich MC carbide and Cr-rich M7C3 and M23C6 carbides were observed in all annealed specimens regardless of annealing and cooling conditions, as expected from an equilibrium phase diagram of the steel used. However, Mo-rich M2C and M6C carbides were unexpectedly precipitated at a temperature between 675 degrees C and 700 degrees C during slow cooling at a rate of below 0.01 degrees C/s from the annealing temperatures of 830 degrees C and below. The solubility of Mo in both M7C3 and ferrite reduces with decreasing temperature during cooling. Mo atoms diffuse out of both M7C3 and ferrite, and accumulate locally at the interface between M7C3 and ferrite. Mo carbides were form at the interface of M7C3 carbides during the transition of Cr-richM(7)C(3) to stable M23C6. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:359 / 366
页数:8
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