期刊
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
卷 45A, 期 6, 页码 2741-2749出版社
SPRINGER
DOI: 10.1007/s11661-014-2232-2
关键词
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资金
- Department of Energy
- NSF CMMI [0727583]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [0727583] Funding Source: National Science Foundation
In excess of 30 vol. pct austenite can be retained in 0.3C-4.0Mn steels subjected to a dual stabilization heat treatment (DSHT) schedule-a five stage precisely controlled cooling schedule that is a variant of the quench and partition process. The temperature of the second quench (stage III) in the DSHT process plays an essential role in the retained austenite contents produced at carbon-partitioning temperatures of 723 K or 748 K (450A degrees A C or 475 A degrees C) (stage IV). A thermodynamic model successfully predicted the retained austenite contents in heat-treated steels, particularly for a completely austenitized material. The microstructure and mechanical behavior of two heat-treated steels with similar levels of retained austenite (similar to 30 vol. pct) were studied. Optimum properties-tensile strengths up to 1650 MPa and similar to 20 pct total elongation-were observed in a steel containing 0.3C-4.0Mn-2.1Si, 1.5 Al, and 0.5 Cr.
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