期刊
MATERIALS & DESIGN
卷 117, 期 -, 页码 248-256出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.12.065
关键词
Quenching and partitioning; Tempered martensite; Retained austenite; Mechanical behavior
资金
- European Research Council under the European Union's Seventh Framework Programme (FP)/ERC Grant [306292]
- National Science Foundation through CAREER Award [0955236]
- National Science Foundation/European Research Council Research Opportunities in Europe for CAREER Awardees program
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0955236] Funding Source: National Science Foundation
The role of retained austenite on tensile behavior in quenched and partitioned (Q&P) steels has been studied extensively, but the deformation behavior of martensite, which comprises the majority of Q&P microstructures, has received less attention. In this investigation, martensite properties were varied through heat treatment in a low carbon Q&P steel consisting of retained austenite and martensite. Additional conditions were produced by reheating the Q&P steel to 450 degrees C for 30 min or to 700 degrees C followed immediately by quenching. The reheated microstructures contained similar fractions of retained austenite as the non-reheated Q&P microstructures, but reheating tempered the martensite, thereby decreasing martensite dislocation density. The reheated conditions had a lower yield stress and initial work hardening rate than the non-reheated Q&P condition. However, the reheated conditions had a greater work hardening rate at larger strains and greater uniform strain due to less stable retained austenite. Furthermore, the tensile strength of the condition reheated to 450 degrees C was nearly equal to the non-reheated condition. In addition to retained austenite to martensite transformation, the early stage work hardening rate of martensite is critical to ductility and is dependent on martensite dislocation density, which can be decreased through tempering. (C) 2017 The Authors. Published by Elsevier Ltd.
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