Hostname: page-component-848d4c4894-75dct Total loading time: 0 Render date: 2024-06-12T20:39:47.197Z Has data issue: false hasContentIssue false
  • English
  • Français

Study of uniform quenching technology of NM450 wear-resistant steel

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 was studied. The temperature field and cooling rate variation of thickness of 45-mm wear-resistant steel (NM450) were calculated for different quenching practices. The microstructure and hardness of quenched plates were examined. The results indicate that when quenching started, the cooling rate was highest on the subsurface and decreased gradually until the center of the plate. However, as the quenching progressed, the cooling rate distribution along the plate thickness was reversed. The cooling rate increased linearly when the heat transfer coefficient (HTC) increased from 0–10 000 W/m2 K, and then the speed gradually slowed down until achieving the maximum cooling rate. Close to the plate mid-thickness, the maximum cooling rate was easily reached. Compared with high-pressure (HP) quenching and low-pressure (LP) quenching, under the HP + LP continuous quenching mode, it is possible to obtain a high critical cooling rate in the temperature range of 900 °C–400 °C and small temperature difference between the surface and center below 400 °C. The microstructure and hardness distribution on the plate surface for the HP + LP quenching mode indicated 100% martensite on the surface and martensite with a little granular bainite in the plate center, while the hardness difference in the entire steel plate was less than 7%. This study provided guidance for the 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