Design and Development of Galvannealed Dual-Phase Steel: Microstructure, Mechanical Properties and Weldability

Journal Article · Tue Jan 15 04:00:00 EST 2019 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-018-3804-X· OSTI ID:22971016

Chatterjee, Sourabh; Koley, Soumyajit; Sarkar, Rudra Bubai; Behera, Nibedita; Manna, Manindra; Mukherjee, Subrata; Kundu, Saurabh ^[1]

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1. Tata Steel Limited, Research & Development (India)

It was attempted to produce galvannealed dual-phase (DP) steel through a commercial continuous galvanizing line (CGL). The main challenge was to form the DP microstructure even with the slow cooling rate after annealing in the CGL. A two-pronged approach was adopted for this, viz. design of the steel chemistry with calculations and optimization of the CGL parameters with simulation using Gleeble-3800 thermomechanical simulator. The steel thus produced in CGL revealed ferrite and 18 ± 2% martensite microstructure, with tensile strength exceeding 600 MPa and 24% total elongation along with good formability. Weldability study using resistance spot welding indicated the possibility of achieving sound joint with a 4-kA width in weld time–current lobe despite the high carbon equivalence.

• OSTI ID: 22971016
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 1 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DESIGN
MICROSTRUCTURE
RESISTANCE WELDING
STEELS
TENSILE PROPERTIES
WELDABILITY