Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 626, Issue -, Pages 207-212Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.12.049
Keywords
Dual-phase steels; Ultrahigh strength steels; Elongation; Manganese alloying; Retained austenite
Categories
Funding
- National Natural Science Foundation of China [U1460203]
- National Basic Research Program of China 973 [2010CB630803]
Ask authors/readers for more resources
We have developed novel ultrahigh-strength cold-rolled transformation-induced plasticity (TRIP) steel sheets manufactured by a simple intercritical annealing process, whose total and uniform elongation of are up to 24.8% and 93% respectively at the ultimate tensile strength of 1 GPa; and 20.0% and 9.0% at 1.2 GPa. They exhibit a better combination of the tensile properties than the present commercial cold-rolled steel sheets for automotive. Such an improvement is achieved by the new designs of chemistries and intercritical annealing (IA) process, i.e. alloying with the 5 wt% Mn content and the IA of martensite rather than the conventional cold rolled microstructures. Both lead to ultrafine austenite grains with enhanced stability formed during IA and retained in the matrix of ferrite and martensite afterwards. Finally, the improvement of elongation is attributed to austenite-to-martensite TRIP effect during the tensile deformation. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available