TY - GEN
T1 - Ultra rapid softening of high strength structural steels by thermomechanical treatment
AU - Adachi, Yoshitaka
AU - Tsuzaki, Kaneaki
PY - 2007
Y1 - 2007
N2 - 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(lOkgf)) 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.
AB - 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(lOkgf)) 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.
UR - http://www.scopus.com/inward/record.url?scp=38349070571&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=38349070571&partnerID=8YFLogxK
U2 - 10.4028/0-87849-428-6.4807
DO - 10.4028/0-87849-428-6.4807
M3 - Conference contribution
AN - SCOPUS:38349070571
SN - 0878494286
SN - 9780878494286
T3 - Materials Science Forum
SP - 4807
EP - 4812
BT - Supplement to THERMEC 2006, 5th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC 2006
PB - Trans Tech Publications Ltd
T2 - 5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006
Y2 - 4 July 2006 through 8 July 2006
ER -