Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 578, Issue -, Pages 370-376Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.04.096
Keywords
Bainitic steel; Mechanical properties; Retained austenite; Ductility; Toughness
Categories
Funding
- National Natural Science Foundation of China [51171166, 50925522]
- Natural Science Foundation of HeBei Province [E2011203066]
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The tensile and impact properties of two low-carbon bainitic transformation-induced plasticity (TRIP) steels, one being Al-free and the other being Al-containing, have been investigated. The two steels are featured by the existence of different sizes and shapes of retained austenite showing different mechanical stabilities. Compared with the Al-containing steel, the Al-free steel shows significantly improved tensile strength, uniform strain and total elongation, but exhibits much decreased impact toughness. These results demonstrate conflicting effects of strain-induced martensitic transformation of retained austenite on tensile ductility and impact toughness of TRIP steels. It is indicated that a wide distribution of size and shape of retained austenite is favorable for sustained high strain hardening rate and increased uniform tensile strain; however, thin films of retained austenite, which is mechanically more stable, tends to enhance impact toughness. (C) 2013 Elsevier B.V. All rights reserved.
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