Austenite grain coarsening of V-microalloyed medium carbon steel during high frequency induction heating: Monte Carlo simulation study

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The austenite grain coarsening behaviour of V-microalloyed (MA) medium carbon steel during induction heating at high frequency is studied, by varying induction input power, and using Gleeble simulating the ultrafast heating rates and Monte Carlo simulation. A significant coarsening of austenite grains occurs in the subsurface layers despite ultrafast heating rates. A distinctive feature is, unlike plain medium carbon steel, an abrupt grain coarsening below a critical depth from the surface. Gleeble experiments suggest that an abrupt grain coarsening is due to dissolution of VC particles. The Monte Carlo simulations, in a simplified temperature and particle fraction profiles, further show that the abrupt grain coarsening in V-MA steel during induction heating can occur not only by the particle pinning but also by the thermal pinning. The activation energy for grain growth is shown to be important in determining the relative contribution to the abrupt grain coarsening. The particle pinning plays an important role in the abrupt grain coarsening because the V-MA medium carbon steel, unlike Cr-Mo steel, shows moderate activation energy for grain growth.
Publisher
MANEY PUBLISHING
Issue Date
2013-12
Language
English
Article Type
Article
Keywords

COMPUTER-SIMULATION; AFFECTED ZONE; GROWTH; COMPONENTS; MODEL; WELD

Citation

MATERIALS SCIENCE AND TECHNOLOGY, v.29, no.12, pp.1414 - 1422

ISSN
0267-0836
DOI
10.1179/1743284713Y.0000000304
URI
http://hdl.handle.net/10203/182553
Appears in Collection
MS-Journal Papers(저널논문)
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