期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.12.049
关键词
Dual-phase steels; Ultrahigh strength steels; Elongation; Manganese alloying; Retained austenite
类别
资金
- National Natural Science Foundation of China [U1460203]
- National Basic Research Program of China 973 [2010CB630803]
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.
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