TY - GEN
T1 - Microstructure and mechanical properties of ausformed ultra high-strength TRIP-aided steels
AU - Sugimoto, Koh Ichi
AU - Itoh, Mitsuhiro
AU - Hojo, Tomohiko
AU - Hashimoto, Shun Ichi
AU - Ikeda, Shushi
AU - Arai, Goro
PY - 2007/1/1
Y1 - 2007/1/1
N2 - Ultra high-strength low-alloyed TRIP-aided steels possess high impact toughness, fatigue strength and hydrogen embrittlement performance, as well as good formability. So, it is expected that the TRIP-aided steels are applied to some automotive parts such as not only center pillar but also driving parts, spring and bolts. In the present study, the effects of ausforming conditions (temperature and strain) after austenitizing on tensile properties and toughness of TRJJP-aided steels with bainitic ferrite matrix were investigated to develop a new type of ultra high-strength forging steel. TRIP-aided steel with chemical composition of 0.2%C, 0.5%Si, 1.5%Mn, 1.0%Al, 0.02%Nb and 0.1 %Mo achieved large total elongation and high impact toughness by ausforming to 0-50% strain at 600-900°C, followed by austempering at 400°C for 500s. This was mainly caused by refined microstructure and stabilized retained austenite.
AB - Ultra high-strength low-alloyed TRIP-aided steels possess high impact toughness, fatigue strength and hydrogen embrittlement performance, as well as good formability. So, it is expected that the TRIP-aided steels are applied to some automotive parts such as not only center pillar but also driving parts, spring and bolts. In the present study, the effects of ausforming conditions (temperature and strain) after austenitizing on tensile properties and toughness of TRJJP-aided steels with bainitic ferrite matrix were investigated to develop a new type of ultra high-strength forging steel. TRIP-aided steel with chemical composition of 0.2%C, 0.5%Si, 1.5%Mn, 1.0%Al, 0.02%Nb and 0.1 %Mo achieved large total elongation and high impact toughness by ausforming to 0-50% strain at 600-900°C, followed by austempering at 400°C for 500s. This was mainly caused by refined microstructure and stabilized retained austenite.
KW - Ausforming
KW - High strength steel
KW - Microstructure
KW - Retained austenite
KW - TRIP-aided steel
KW - Tensile properties
KW - Toughness
UR - http://www.scopus.com/inward/record.url?scp=38349101098&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=38349101098&partnerID=8YFLogxK
U2 - 10.4028/0-87849-428-6.4309
DO - 10.4028/0-87849-428-6.4309
M3 - Conference contribution
AN - SCOPUS:38349101098
SN - 0878494286
SN - 9780878494286
T3 - Materials Science Forum
SP - 4309
EP - 4314
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 -