TY - JOUR
T1 - Effect of Si and Al on microstructure-property-relationship of Q&P-steels during galvannealing
AU - Wallner, M.
AU - Schneider, R.
AU - Steineder, K.
AU - Sommitsch, C.
N1 - Funding Information:
The authors sincerely acknowledge the support of the Austrian Research Promotion Agency (FFG) related to the frontrunner project No. 860188 ‘Upscaling of medium Mn-TRIP steels’.
Publisher Copyright:
© 2021 Institute of Materials, Minerals and Mining.
PY - 2021
Y1 - 2021
N2 - The influence of a thermal-treatment simulating a galvannealing-process (GA) on the microstructure of a 0.2C–4Mn–1.5Si and 0.2C–4Mn–1.5Al (in wt-%) medium-Mn-Q&P-steel was investigated in detail using dilatometry. After Q&P-process, the retained austenite (RA) fraction is higher and mechanical properties are superior for the Si-concept. Owing to galvannealing, strength decreases substantial for both concepts. For the Si-concept however, RA starts to decompose into pearlite upon galvannealing temperatures of 520°C, leading to a significant decrease in elongation. For the Al-concept, the RA-fraction remains constant up to 560°C, which even results in increased elongations values compared to the galvannealed Si concept. This contribution shows that Al as an alloy-element in Q&P-steel is more suitable for RA stabilisation at higher temperature than Si.
AB - The influence of a thermal-treatment simulating a galvannealing-process (GA) on the microstructure of a 0.2C–4Mn–1.5Si and 0.2C–4Mn–1.5Al (in wt-%) medium-Mn-Q&P-steel was investigated in detail using dilatometry. After Q&P-process, the retained austenite (RA) fraction is higher and mechanical properties are superior for the Si-concept. Owing to galvannealing, strength decreases substantial for both concepts. For the Si-concept however, RA starts to decompose into pearlite upon galvannealing temperatures of 520°C, leading to a significant decrease in elongation. For the Al-concept, the RA-fraction remains constant up to 560°C, which even results in increased elongations values compared to the galvannealed Si concept. This contribution shows that Al as an alloy-element in Q&P-steel is more suitable for RA stabilisation at higher temperature than Si.
KW - austenite decomposition
KW - carbide precipitation
KW - galvannealing
KW - martensite tempering
KW - mechanical properties
KW - Quenching & partitioning
KW - retained austenite
KW - thermal stability
UR - http://www.scopus.com/inward/record.url?scp=85101185984&partnerID=8YFLogxK
U2 - 10.1080/02670836.2021.1882754
DO - 10.1080/02670836.2021.1882754
M3 - Article
AN - SCOPUS:85101185984
SN - 0267-0836
VL - 37
SP - 182
EP - 189
JO - Materials Science and Technology (United Kingdom)
JF - Materials Science and Technology (United Kingdom)
IS - 2
ER -