Medium-Mn Martensitic Steel Ductilized by Baking

In this study, the microstructure and mechanical properties, especially the impacts of low-temperature tempering, of the medium-Mn martensitic steel were examined. The low-temperature tempering simulated paint baking in car manufacturing. Significant improvement of tensile ductility was achieved by...

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Bibliographic Details
Published inMetallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 50; no. 9; pp. 4067 - 4074
Main Authors Lu, Q., Eizadjou, M., Wang, J., Ceguerra, A., Ringer, S., Zhan, H., Wang, L., Lai, Q.
Format Journal Article
LanguageEnglish
Published New York Springer US 15.09.2019
Springer Nature B.V
Subjects
Baking
Carbon
Characterization and Evaluation of Materials
Chemistry and Materials Science
Ductile fracture
Ductile-brittle transition
Ductility
Heat treating
Martensitic stainless steels
Materials Science
Mechanical properties
Metallic Materials
Nanotechnology
Retained austenite
Steel
Structural Materials
Structural steels
Surfaces and Interfaces
Tempering
Thin Films
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Summary:In this study, the microstructure and mechanical properties, especially the impacts of low-temperature tempering, of the medium-Mn martensitic steel were examined. The low-temperature tempering simulated paint baking in car manufacturing. Significant improvement of tensile ductility was achieved by baking, associating with a change from brittle to ductile fracture behavior. The ductilization was attributed to the carbon re-distribution during baking, as allowed by the high volume fraction of retained austenite (15 pct). The carbon distribution was characterized by Atom Probe Tomography. The baked medium-Mn martensitic steel presents an excellent strength–ductility combination, which is a promising candidate as next-generation high-performance steels for vehicle lightweighting.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-019-05335-5