ISSN: 1546-962X
CODEN: JAIOAD
Published Online: 16 October 2008
Page Count: 5

Determination of Surface Heat Transfer Coefficients of Cr12MoV Steel Cylinder during High-Speed Gas Quenching at Atmospheric Pressure

Heming, Cheng
Kunming University of Science and Technology, Kunming,

Jianyun, Li
Kunming University of Science and Technology, Kunming,

Ziliang, Li
Kunming University of Science and Technology, Kunming,

Lijun, Hou
Kunming University of Science and Technology, Kunming,

Jie, Hou
Kunming University of Science and Technology, Kunming,

(Received 16 April 2008; accepted 8 September 2008)

Abstract

In the numerical simulation of quenching processes, establishment of the boundary conditions for the temperature field and stress field are very important. However, determination of the boundary conditions of the temperature field is very complicated. In order to simulate the thermal strain, thermal stress, residual stress, and microstructure of the steel during high-speed gas quenching at atmospheric pressure using a numerical method, it is necessary to obtain an accurate boundary condition of temperature field. The surface heat transfer coefficient is a key parameter. The explicit finite difference method, nonlinear estimate method, and the experimental relationship between temperature and time during quenching have been used to solve the inverse problem of heat conduction during gas quenching. The relationships between surface temperature and surface heat transfer coefficient of a solid cylinder are provided here. In addition, it is shown that this technique can determine the effective surface heat transfer coefficients during high-speed gas quenching.

Keywords:
high speed gas quenching, surface heat transfer coefficient, temperature, finite difference method

Paper ID: JAI101813
DOI: 10.1520/JAI101813
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