Hostname: page-component-78c5997874-m6dg7 Total loading time: 0 Render date: 2024-11-10T12:46:45.221Z Has data issue: false hasContentIssue false
  • English
  • Français

Study of uniform quenching technology of NM450 wear-resistantsteel

Published online by Cambridge University Press:  31 October 2013

C. Wang ,
Z.-D. Wang ,
Y. Han ,
X.-T. Deng  and
G.-D. Wang
Get access

Abstract

The finite difference method of the low-alloy wear-resistant steel quenching process wasstudied. The temperature field and cooling rate variation of thickness of 45-mmwear-resistant steel (NM450) were calculated for different quenching practices. Themicrostructure and hardness of quenched plates were examined. The results indicate thatwhen quenching started, the cooling rate was highest on the subsurface and decreasedgradually until the center of the plate. However, as the quenching progressed, the coolingrate distribution along the plate thickness was reversed. The cooling rate increasedlinearly when the heat transfer coefficient (HTC) increased from 0–10 000W/m2 K, and then the speed gradually slowed down until achieving the maximumcooling rate. Close to the plate mid-thickness, the maximum cooling rate was easilyreached. Compared with high-pressure (HP) quenching and low-pressure (LP) quenching, underthe HP + LP continuous quenching mode, it is possible to obtain a high critical coolingrate in the temperature range of 900 °C–400 °C and small temperature difference betweenthe surface and center below 400 °C. The microstructure and hardness distribution on theplate surface for the HP + LP quenching mode indicated 100% martensite on the surface andmartensite with a little granular bainite in the plate center, while the hardnessdifference in the entire steel plate was less than 7%. This study provided guidance forthe formulation and optimization of wear-resistant steel.

Keywords

Wear-resistant steelquenchcooling uniformitycooling ratequenching mode
Type
Research Article
Information
Metallurgical Research & Technology , Volume 110 , Issue 5 , 2013 , pp. 331 - 339
Copyright
© EDP Sciences 2013

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Deng, X.-T., Wang, Z.-D., Yuan, G., Journal of Northeastern University Nature Science 31 (2010) 942
Borean, J.-L., Romberger, C., Manga, P.-S., Petesch, T., Daubigny, A., Rev. Métallurgie 108 (2011) 165-174
D.-P. DeWitt, Fundamentals of Heat and Mass Transfer, 5th Edition, pp. 620-690
F. Akio, O. Kazuo, JFE Steel’s Advanced Manufacturing Technologies for High Performance Steel Plates, JFE Technical Report No. 5
Wang, G.-D., Shanghai Metals 29 (2007) 1-5
Chen, S.-J., Biswas, S.-K., Han, L.-F., Satyanarayana, A., Monitoring and Control for Manufacturing Processes 44 (1990) 465-473
X.-Q. Kong, Application of the Finite Element Method in Heat Transfer, Beijing, Publishing House of Science, 1998
Z. Tan, G.W. Guo, Engineering Alloy Thermal Properties, Beijing, Metallurgical Industry Press, 1994
Wang, Z.-D., Yuan, G., Wang, G.-D., Liu, X.-H., Iron and Steel 41 (2006) 54-56
Wang, C., Wang, Z.-D., Yuan, G., Wang, D.-Y., Wu, J.-P., Wang, G.-D., J. Iron Steel Res. 20 (2013) 1-5