期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 710, 期 -, 页码 702-710出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.03.024
关键词
Bainitic steel; Austempering; Strength-toughness combination; Coalescence; Prior austenite grain size
资金
- National Natural Science Foundation of China [51101033, 51204049, 51274063]
- Fundamental Research Funds for the Central Universities of China [N130407002]
- University of Texas at El Paso, USA
A low carbon bainitic steel with ultrahigh strength of similar to 1650 MPa and elongation and toughness of similar to 16% and similar to 72 J/cm(2) respectively, was obtained through austempering. The resulting microstructure and mechanical properties for varying prior austenite grain size (PAGS) are described. The refinement of the PAGS resulted in finer packet/block size, higher volume fraction and higher stability of retained austenite. The coalescence of bainitic laths was effectively hindered when the prior austenite grain size (FAGS) was refined to similar to 10 mu m. On the other hand, the coalescence of bainitic laths with crystallographically homogeneous characteristic was accompanied by disappearance of film-like retained austenite and crack can propagate without inhibition, which is detrimental to toughness. Eliminating the coalescence of bainite and increasing the volume fraction of retained austenite and its stability by means of refining PAGS contributed to ultrahigh strength high ductility and toughness combination. (C) 2017 Elsevier B.V. All rights reserved.
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