Journal
SCRIPTA MATERIALIA
Volume 155, Issue -, Pages 164-168Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.06.042
Keywords
lnterctitical heat treatment; Deformation induced martensite transformation; Retained austenite; Low yield ratio
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Funding
- National Natural Science Foundation of China [51701012]
- Fundamental Research Funds for Central Universities [FRF-TP-17-004A1]
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A significant volume fraction of 26% retained austenite was obtained via a two-step intercritical treatment in a low carbon low alloy steel with ultra-high tensile strength of similar to 1200 MPa, ultra-low yield ratio of 0.32, excellent uniform elongation of similar to 16.4% and total elongation of similar to 23%. The ultra-low yield ratio and excellent uniform elongation implied high work hardening and excellent formability. The high work hardening and ultra-high tensile strength are attributed to deformation-induced twin-martensite. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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