Open AccessDevelopment of high strength steel sheet with improved strainhardenability for automotive application
Author(s) -
Madhawan Chandrawanshi,
Rajan Singh,
R. Sudharshan
Publication year - 2019
Publication title -
izvestiâ vysših učebnyh zavedenij. černaâ metallurgiâ
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.3
H-Index - 7
eISSN - 2410-2091
pISSN - 0368-0797
DOI - 10.17073/0368-0797-2019-11-827-832
Subject(s) - microstructure , materials science , austenite , bainite , formability , hardenability , metallurgy , martensite , trip steel , galvanization , ferrite (magnet) , annealing (glass) , high strength steel , elongation , composite material , ultimate tensile strength , layer (electronics) , alloy
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 coecient of new steel is comparable to that of drawing grades attributable to about 13 % retained austenite in microstructure.