ISSN 2594-5327
49º Congresso anual — Vol. 49, Num. 1 (1994)
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The effects of chemical composition and processing parameters on the formation of retained austenite and the mechanical properties were studied in order to determine processing conditions for ultra high strength steels with excellent ductility accompanied by TRIP (transformation induced plasticity) of retained austenite. The key findings are as follows: The steel containing 0.20% C – 1.5% Si – 1.5% Mn displayed more than 20% of retained austenite and a super high strength with tensile strength around 1000 MPa after continuous annealing. Aluminum addition contributed to the formation of retained austenite and flexibility in heat treatment. Molybdenum or vanadium addition substantially increased the strength due to the precipitation strengthening of Mo and V inside the ferrite matrix. The most useful combination of high strength and reasonable ductility was achieved with an addition of 0.2 wt% Mo. As a result, a 1000 MPa grade of ultra high strength steel sheet with notably high ductility was experimentally produced by introducing a large amount of retained austenite in a 0.25% C – 1.5% Si – 1.5% Mn – 0.2% Mo steel using the heat cycle of continuous annealing process.
Palavras-chave
TRIP steel, retained austenite, ultra high strength steel, continuous annealing, transformation-induced plasticity
Como citar
KIM, JIUYONG; SHIM, JANGSUB; AIO, SUNGJUN; PARK, KIMICHE.
Manufacturing Process of Ultra High Strength Steel Sheet with the Characteristic of Transformation Induced Plasticity,
p. 3635-3646.
In: 49º Congresso anual,
Rio de Janeiro, Brasil,
1994.
ISSN: 2594-5327, DOI 10.5151/2594-5327-49v8-117-128
