Applying computer simulation in improving heat treating condition of thin high-carbon steel parts

Authors

  • Thanaporn Korad National Metal and Materials Technology Center
  • Mana Polboon National Metal and Materials Technology Center
  • Niphon Chumchery National Metal and Materials Technology Center
  • John Pearce National Metal and Materials Technology Center

Keywords:

Austempering, Hardening, High carbon steel, Bainite structure

Abstract

The study was carried out using COSMOSFlowWorks® to predict heat treatment conditions for AISI 1085 high-carbon steel sheet that is used to produce automotive parts that require wear resistance and stiffness resulting from controlled moderately high hardness levels. To achieve such properties, flat high-carbon steel parts need to be hardened to produce acicular matrix structures, and the most suitable heat treatment process to harden thin parts without distortion is austempering. In producing hard and stiff thin section parts in this company study the austempering process was performed by soaking at 830ºC and then quenching in a NaCl salt bath at 335ºC. In production hardness testing is performed to ensure that parts have microstructures of lower bainite and martensite instead of upper bainite. To reduce distortion without any effect on hardness, modified austempering conditions were determined using temperature prediction from commercial computational analysis software. This enabled a more suitable production line practice for the production of austempered parts without distortion whilst avoiding reduced hardness.

Downloads

Download data is not yet available.

References

American Society for Metals. (1977). Atlas of isothermal transformation cooling transformation diagrams. : ASM.

Chakraborty, J., Bhattacharjee, D. & Manna, I. (2008). Austempering of bearing steel for improved mechanical properties. Scripta Mater. 59(2): 247-250.

Li, H. & Zhou, X. (2007). The Application and Effects of Thin Sheet Hardness Reference Materials without Aging Effect. In: Proceedings of HARDMEKO 2007 Recent Advancement of Theory and Practice in Hardness Measurement. November 19-21, Tsukuba, Japan: 117- 119.

Saxena, A., Prasad, S.N., Goswami, S., Subudhi, J. & Chaudhuri, S.K. (2006). Influence of austempering parameters on the microstructure and tensile properties of a medium carbon–manganese steel. Mat. Sci. Eng. A-Struct 431(1-2): 53-58.

Tu, M.Y., Hsu, C.A., Wang, W.H. & Hsu, Y.F. (2008). Comparison of microstructure and mechanical behavior of lower bainite and tempered martensite in JIS SK5 steel. Mater. Chem. Phys. 107(2-3): 418-425.

Zienkiewicz, O.C. & Tayler, R.L. (2000). Finite element method (5th ed.). (Vol.3 Fluid Dynamics): ButterworthHeinemann.

Downloads

Published

2011-06-30

How to Cite

[1]
T. Korad, M. . Polboon, N. . Chumchery, and J. . Pearce, “Applying computer simulation in improving heat treating condition of thin high-carbon steel parts”, J Met Mater Miner, vol. 21, no. 1, Jun. 2011.

Issue

Section

Original Research Articles