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| Vacuum Low-pressure Carburization of Gear Steel 16Cr3NiWMoVNbE for Aviation |
WANG Bin,HE Yanping,WANG Haojie,TIAN Yong( ),JIA Tao,WANG Bingxing,WANG Zhaodong |
| State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819，China |
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Cite this article:
WANG Bin,HE Yanping,WANG Haojie,TIAN Yong,JIA Tao,WANG Bingxing,WANG Zhaodong. Vacuum Low-pressure Carburization of Gear Steel 16Cr3NiWMoVNbE for Aviation. Chinese Journal of Materials Research, 2020, 34(1): 35-42.
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Abstract The combined process of vacuum low-pressure carburizing heat treatment for aviation gear steel 16Cr3NiWMoVNbE was investigated, with the emphasis on the effect of carburizing, quenching, cryogenic treatment and tempering process on the microstructure and mechanical properties of the steel. The results show that after carburizing and quenching, the cross sectional microstructure of the steel, can be differentiated as carbide region, mixed region of carbide and acicular martensite, acicular martensite region and lath martensite region from the surface to the center. A large number of blocky Cr carbides precipitated at grain boundaries in the carbide region, where very little Ni can be detected. The fine precipitates in the acicular martensite and the lath martensite matrix are carbides of the microalloying elements Nb, V, and Mo. After the carburization, the carbon concentration of the carburized steel decreases gradually from the surface to the center, correspondingly, the hardness increased first and then decreased, and the depth of carburized layer was 0.95 mm. The subzero treatment at -70oC promotes the transformation of retained austenite to martensite, which greatly improves the overall hardness of the carburized steel.
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Received: 03 July 2019
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| Fund: National Natural Science Foundation of China(51604074);Fundamental Research Funds for the Central Universities(N170704012);Open Project of State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University(SKLASS 2019-02) |
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