期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 528, 期 29-30, 页码 8486-8491出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.07.049
关键词
Dislocation density; Ductility enhancement; Retained austenite absorbing dislocations; Q-P-T process
类别
资金
- National Natural Science Foundation of China [51031001, 51071101]
A high-strength martensitic steel treated by a quenching-partitioning-tempering process is presented to examine the effect of retained austenite on ductility enhancement in martensitic steels. Results from X-ray diffraction line profile analysis (XLPA) indicate that the average dislocation density in martensite during uniform deformation is lower than before deformation, which effectively intensifies the deformation ability. The average dislocation density in retained austenite rapidly increases with increased strain and exceeds that in martensite. Based on the XLPA results, a new effect of austenite on the ductility enhancement is proposed: the austenite phase can continuously absorb ample dislocations from neighbouring martensite laths. This effect is indirectly verified by transmission electron microscopy. (C) 2011 Elsevier B.V. All rights reserved.
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