Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 627, Issue -, Pages 359-366Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.11.189
Keywords
Metals and alloys; Precipitation; Phase transitions; Phase diagrams; Microstructure
Categories
Funding
- Industrial Strategic Technology Development Program - Ministry of Knowledge Economy (MKE, Korea) [10040066]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10040066] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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