TY - GEN
T1 - Hydrogen embrittlement resistances of alloying elements adding ultra high strength low alloy TRIP-aided steels
AU - Hojo, Tomohiko
AU - Kobayashi, Junya
AU - Sugimoto, Koh Ichi
PY - 2012/12/1
Y1 - 2012/12/1
N2 - To develop ultra high strength steels for automotive impact safety parts, effects of alloying elements on hydrogen embrittlement resistance of ultra high strength low alloy TRIP-aided steels with martensitic matrix (TM steel) were investigated. Hydrogen embrittlement susceptibilities of TRIP-aided steels were decreased by addition of alloying elements although tensile strength and diffusible hydrogen concentration of alloying elements adding TM steels were increased compared with base steel. Particularly, when 1.0 mass% chromium was added to the TM steels, TM steel indicated low hydrogen embrittlement susceptibility. It is considered that uniform and refined lath matrix and retained austenite/matrix interface absorbed a large amount of diffusible hydrogen in order to suppress hydrogen trapping to the grain boundaries and the lath boundaries and strain induced transformation of stable retained austenite suppressed initiation and growth of voids and initiation and propagation of cracks effectively.
AB - To develop ultra high strength steels for automotive impact safety parts, effects of alloying elements on hydrogen embrittlement resistance of ultra high strength low alloy TRIP-aided steels with martensitic matrix (TM steel) were investigated. Hydrogen embrittlement susceptibilities of TRIP-aided steels were decreased by addition of alloying elements although tensile strength and diffusible hydrogen concentration of alloying elements adding TM steels were increased compared with base steel. Particularly, when 1.0 mass% chromium was added to the TM steels, TM steel indicated low hydrogen embrittlement susceptibility. It is considered that uniform and refined lath matrix and retained austenite/matrix interface absorbed a large amount of diffusible hydrogen in order to suppress hydrogen trapping to the grain boundaries and the lath boundaries and strain induced transformation of stable retained austenite suppressed initiation and growth of voids and initiation and propagation of cracks effectively.
KW - Alloying elements
KW - Hydrogen embrittlement
KW - Retained austenite
KW - TRIP
KW - Ultra high strength steel
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M3 - Conference contribution
AN - SCOPUS:84875766629
SN - 9781622766536
T3 - Materials Science and Technology Conference and Exhibition 2012, MS and T 2012
SP - 1186
EP - 1193
BT - Materials Science and Technology Conference and Exhibition 2012, MS and T 2012
T2 - Materials Science and Technology Conference and Exhibition 2012, MS and T 2012
Y2 - 7 October 2012 through 11 October 2012
ER -