Paper Title:
Ultra Rapid Softening of High Strength Structural Steels by Thermomechanical Treatment
  Abstract

This study aims to shorten the softening treatment period as possible in high strength structural steels. The steel used is SCM440 steel. As an initial microstructure, martensite, bainite, pearlite and complicated microstructure consisting of ultrafine polygonal, martensite and equiaxed cementite were extensively examined to understand their softening process on aging at 973K. These initial microstructures were prepared by heat or thermomechanical treatment. Their initial Vickers hardness (Hv(10kgf)) were 634, 281, 219 and 238, respectively. It is noteworthy that within five minutes on aging hardness of the complicated microstructure reached lower than Hv200, while it took more than several hours for other initial microstructures. A quantitative evaluation of microstructures appears to help in understanding the mechanism of the softening kinetics.

  Info
Periodical
Materials Science Forum (Volumes 539-543)
Main Theme
Edited by
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
Pages
4807-4812
DOI
10.4028/www.scientific.net/MSF.539-543.4807
Citation
Y. Adachi, K. Tsuzaki, "Ultra Rapid Softening of High Strength Structural Steels by Thermomechanical Treatment", Materials Science Forum, Vols. 539-543, pp. 4807-4812, 2007
Online since
March 2007
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Price
$32.00
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