Austenite Decomposition and Precipitation Behavior of Plastically Deformed Low-Si Microalloyed Steel

The aim of the present study is to assess the effects of hot deformation and cooling paths on the phase transformation kinetics in a precipitation-strengthened automotive 0.2C–1.5Mn–0.5Si steel with Nb and Ti microadditions. The analysis of the precipitation processes was performed while taking into...

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Bibliographic Details
Published in:Metals (Basel ) 2018-12, Vol.8 (12), p.1028
Main Authors: Grajcar, Adam, Morawiec, Mateusz, Zalecki, Wladyslaw
Format: Article
Language:English
Subjects:
Austenite
austenite decomposition
Automobile industry
Bainitic transformations
Carbon
Cold
Cooling
Cooling rate
Decomposition
Deformation
Deformation effects
Dilatometry
Equilibrium
Grain growth
Grain size
High strength low alloy steels
high-strength steel
Mathematical analysis
microstructure evolution
Nitrogen
phase transformation
Phase transitions
Solid solutions
Steel
Temperature
Titanium
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Summary:The aim of the present study is to assess the effects of hot deformation and cooling paths on the phase transformation kinetics in a precipitation-strengthened automotive 0.2C–1.5Mn–0.5Si steel with Nb and Ti microadditions. The analysis of the precipitation processes was performed while taking into account equilibrium calculations and phase transitions resulting from calculated time–temperature–transformation (TTT) and continuous cooling transformation (CCT) diagrams. The austenite decomposition was monitored based on thermodynamic calculations of the volume fraction evolution of individual phases as a function of temperature. The calculations were compared to real CCT and DCCT (deformation continuous cooling transformation) diagrams produced using dilatometric tests. The research included the identification of the microstructure of the nondeformed and thermomechanically processed supercooled austenite products formed at various cooling rates. The complex interactions between the precipitation process, hot deformation, and cooling schedules are linked.
ISSN:2075-4701
2075-4701
DOI:10.3390/met8121028