MS  >> Vol. 7 No. 3 (May 2017)

    深冷处理对17CrNiMo6钢渗碳层组织和硬度的影响
    Effect of Cryogenic Treatment on Microstructure and Hardness in Carburized Layer of 17CrNiMo6 Steel

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作者:  

成 卓,李亚微,蒋显全,施 梦:西南大学 材料与能源学部,重庆

关键词:
深冷处理17CrNiMo6钢组织硬度Cryogenic Treatment 17CrNiMo6 Steel Microstructure Hardness

摘要:

对经不同深冷工艺处理后的17CrNiMo6钢进行了组织观察、力学性能检测、摩擦磨损试验和X射线衍射试验。结果表明,回火前深冷处理能显著降低钢中残余奥氏体量,析出细小弥散的碳化物颗粒,且组织更加均匀,从而增大有效渗硬层深度,使钢的硬度和耐磨性得到显著提高,但冲击韧性略有降低。与普通热处理相比,回火后深冷处理出现大的块状碳化物,残余奥氏体含量增加,组织均匀性变差,对钢的性能改善不利。综合来讲,“淬火,840℃ × 2 h + 深冷处理,−150℃ × 10 h + 回火,200℃ × 4 h”工艺能使17CrNiMo6钢的组织和综合性能都达到最佳状态。

The microstructure, mechanical properties, wear resistance and X-ray diffraction of 17CrNiMo6 steel with different cryogenic treatment were investigated. The results revealed that, when the samples experienced cryogenic treatment before tempering, the residual austenite content decreased significantly, more carbides precipitation formed in the steel and the microstructure was more uniform, thus the effective hardened layer depth increased. As a result, hardness and wear resistance improved obviously with a slight decrease of impact toughness. However, when the samples experienced cryogenic treatment after tempering, the lumpish carbides emerged, the content of retained austenite increased and the microstructure was less uniform than that of common heat treatment, which could not improve the performance of the steel well. In conclusion, the microstructure and combination properties of 17CrNiMo6 steel when it experienced cryogenic treatment at −150˚C for 10 h before tempering at 200˚C for 4 h achieved best.

文章引用:
成卓, 李亚微, 蒋显全, 施梦. 深冷处理对17CrNiMo6钢渗碳层组织和硬度的影响[J]. 材料科学, 2017, 7(3): 295-303. https://doi.org/10.12677/MS.2017.73040

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