Process Design for Tough Ductile Martensitic Steels through Direct Quenching and Partitioning

A novel processing route comprising of thermomechanical rolling followed by direct quenching and partitioning (DQP) has been established for developing tough ductile high strength steels with yield strengths ≈1100MPa. Suitable compositions were designed based on high silicon and/or aluminum contents...

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Bibliographic Details
Published in:Materials today : proceedings 2015, Vol.2, p.S631-S634
Main Authors: Somani, M.C., Porter, D.A., Karjalainen, L.P., Suikkanen, P.P., Misra, R.D.K.
Format: Article
Language:English
Subjects:
Direct quenching and partitioning
martensite
mechanical properties
retained austenite
thermomechanical rolling
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Summary:A novel processing route comprising of thermomechanical rolling followed by direct quenching and partitioning (DQP) has been established for developing tough ductile high strength steels with yield strengths ≈1100MPa. Suitable compositions were designed based on high silicon and/or aluminum contents and the microstructural mechanisms and DQP parameters established through physical simulation on a Gleeble simulator. Based on these results, suitable laboratory rolling trials were designed that also enabled coiling simulation. Desired martensite-austenite microstructures in respect of refined and randomized martensite packets/laths and finely divided austenite resulted in excellent mechanical properties, particularly at low quenching temperatures.
ISSN:2214-7853
2214-7853
DOI:10.1016/j.matpr.2015.07.363