Development of high strength steel sheet with improved strainhardenability for automotive application
https://doi.org/10.17073/0368-0797-2019-11-827-832
Abstract
Advance high strength steel with minimum UTS of 780 MPa is industrially developed utilizing continuous annealing line (CAL) and Gleeble thermo mechanical simulation. An outline of superior elongation, improved strain hardenability, enhanced strength of developed Fe – C – Mn – Si TRIP assisted steel is described. Correlation amid Simulated result and industrially annealed steel are stabilized for microstructure and mechanical property. Annealing condition is optimized for best combination of strength and formability accordingly. CCT diagram for the selected composition from JMatPro is utilized to optimize rapid cooling rate and over aging section temperature. Final microstructure of developed steel comprises tempered martensite, granular bainite with retained austenite distributed in polygonal ferrite matrix. An evaluation of developed TRIP steel is carried out with the help of microstructure and XRD analysis. It was concluded that strain hardening coefficient of new steel is comparable to that of drawing grades attributable to about 13 % retained austenite in microstructure.
About the Authors
Madhawan Chandrawanshi
JSW Steel Ltd, Vijayanagar works
India
India
Madhawan Chandrawanshi, Assistant Manager, New Product Development
Toranagallu, Karnataka, 583275
Rajan Kumar Singh
JSW Steel Ltd, Vijayanagar works
India
India
Rajan Kumar Singh, Manager, New Product Development
Toranagallu, Karnataka, 583275
R. Sudharshan
JSW Steel Ltd, Vijayanagar works
India
India
Sudharshan R., Assistant Manager, New Product Development
Toranagallu, Karnataka, 583275
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Review
For citations:
Chandrawanshi M., Kumar Singh R., Sudharshan R. Development of high strength steel sheet with improved strainhardenability for automotive application. Izvestiya. Ferrous Metallurgy. 2019;62(11):827-832. https://doi.org/10.17073/0368-0797-2019-11-827-832
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