Microstructural Characterization of a 1200 MPa Complex-Phase Steel

The demand for new advanced high strength steels (AHSS) has been increasing in the last few decades. A large part of this demand comes from automotive companies. We have produced a new complex-phase (CP) steel with 1200 MPa of mechanical resistance and 8% of elongation, called CP1200. In this paper...

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Published in:Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2023-01, Vol.26, p.1
Main Authors: Lima, Renan de Melo Correia, Spadotto, Julio Cesar, Tolomelli, Flávia Tereza dos Santos Fernandes, Navarro, Maria Isabel Ramos, Clarke, Amy J., Clarke, Kester D., Assunção, Fernando Cosme Rizzo
Format: Article
Language:English
Subjects:
AHSS
Automobile industry
Bainite
Complex-Phase steel
Dilatometry
Electron back scatter
Elongation
ENGINEERING, CHEMICAL
Heat treatment
High strength steels
Martensite
MATERIALS SCIENCE, MULTIDISCIPLINARY
Mechanical properties
METALLURGY & METALLURGICAL ENGINEERING
Microstructure
Optical microscopy
Phase Transformation
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Summary:The demand for new advanced high strength steels (AHSS) has been increasing in the last few decades. A large part of this demand comes from automotive companies. We have produced a new complex-phase (CP) steel with 1200 MPa of mechanical resistance and 8% of elongation, called CP1200. In this paper the dilatometric and microstructural characterization of a newly produced CP1200 steel is presented. The new steel was produced by making changes to the heat treatment of the already industrially available CP1100. The microstructure was quantified using light optical microscopy (LOM) and electron backscatter diffraction (EBSD). The microstructure of both steels was compared to identify the origin of the mechanical properties improvement. A new microstructure distribution, with higher amount of bainite and smaller concentration of ferrite and martensite was identified.
ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/1980-5373-mr-2023-0015