Influence of Al on the Microstructural Evolution and Mechanical Behavior of Low-Carbon, Manganese Transformation-Induced-Plasticity Steel

Microstructural design with an Al addition is suggested for low-carbon, manganese transformation-induced-plasticity (Mn TRIP) steel for application in the continuous-annealing process. With an Al content of 1 mass pct, the competition between the recrystallization of the cold-rolled microstructure a...

Full description

Saved in:
Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2010-02, Vol.41 (2), p.397-408
Main Authors: Suh, Dong-Woo, Park, Seong-Jun, Lee, Tae-Ho, Oh, Chang-Seok, Kim, Sung-Joon
Format: Article
Language:English
Subjects:
Alloys
Applied sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cold
Exact sciences and technology
Materials Science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metallic Materials
Metals. Metallurgy
Microstructure
Nanotechnology
Steel
Structural Materials
Surfaces and Interfaces
Thin Films
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Microstructural design with an Al addition is suggested for low-carbon, manganese transformation-induced-plasticity (Mn TRIP) steel for application in the continuous-annealing process. With an Al content of 1 mass pct, the competition between the recrystallization of the cold-rolled microstructure and the austenite formation cannot be avoided during intercritical annealing, and the recrystallization of the deformed matrix does not proceed effectively. The addition of 3 mass pct Al, however, allows nearly complete recrystallization of the deformed microstructure by providing a dual-phase cold-rolled structure consisting of ferrite and martensite and by suppressing excessive austenite formation at a higher annealing temperature. An optimized annealing condition results in the room-temperature stability of the intercritical austenite in Mn TRIP steel containing 3 mass pct Al, permitting persistent transformation to martensite during tensile deformation. The alloy presents an excellent strength-ductility balance combining a tensile strength of approximately 1 GPa with a total elongation over 25 pct, which is comparable to that of Mn TRIP steel subjected to batch-type annealing.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-009-0124-7