期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.143400
关键词
20Cr2Ni2MoV steel; Carburization; Re-quenching; Ultrahigh strength; Ductility
类别
资金
- Natural Science Foundation of China [51922026, 51574079]
The mechanical properties of micro-alloyed gear steel can be improved through the fabrication route composed of carburizing and re-quenching. Different re-quenching temperatures significantly affect the sizes and morphologies of precipitates and martensite, as well as the ratio of low-angle grain boundaries to high-angle grain boundaries and dislocation densities. The highest ultimate tensile strength of 2420 MPa was achieved after re-quenching at 780 degrees C, while the steel re-quenched at 820 degrees C exhibited the highest yield strength of 1500 MPa.
The super combination of ultrahigh strength and good ductility is in high demand for the gear steels. Here we improved the mechanical properties of a micro-alloyed gear steel through the fabrication route composed of carburizing and re-quenching. The results showed that the different re-quenching temperatures significantly affect not only the sizes and morphologies of precipitates and martensite but also the ratio of low-angle grain boundaries to high-angle grain boundaries as well as dislocation densities. The maximum ultimate tensile strength up to 2420 MPa was obtained after re-quenching at 780 degrees C, while the steel re-quenched at 820 degrees C exhibited the highest yield strength of 1500 MPa despite of the decreased ultimate tensile strength of 2145 MPa. Especially, a good ductility of 8.5% was maintained in the carburized steel processed after 780 degrees C re-quenching. The spherically nanosized precipitates together with the high ratio of low-angle grain boundaries were beneficial for the simultaneously improved strength and ductility.
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