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
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:Abstract: 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 (2017) 深冷处理对17CrNiMo6钢渗碳层组织和硬度的影响。 材料科学, 7, 295-303. doi: 10.12677/MS.2017.73040
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