Abstract The supersonic fine particles bombarding (SFPB) pretreatment is adopted to assist vacuum carburizing for refining the microstructure and improving the mechanical properties of carburized layer. The microstructures, micrhardness and tribology properties of SFPB carburized sample and vacuum carburized sample were studied. The results showed that SFPB pretreatment could form random oriented, ultrafine-grained microstructure and high density dislocations in AISI 9310 steel, leading to the increase of case depth of carburized layer, the refinement of grain size and the promotion of the formation of twin martensite and carbides in carburized layer. Besides, the surface microhardness, maximum residual compressive stress and wear rate of carburized layer were enhanced by SFPB pretreatment, which was attributed to the formation of twin martensite, grain refinement, dispersion strengthening of carbides and the increase of high misorientation angle grain boundary.

中文翻译：

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表面纳米化预处理对高温真空渗碳行为的影响

摘要 采用超音速微粒轰击（SFPB）预处理辅助真空渗碳，细化渗碳层组织，提高渗碳层力学性能。研究了SFPB渗碳试样和真空渗碳试样的显微组织、显微硬度和摩擦学性能。结果表明，SFPB预处理可以在AISI 9310钢中形成随机取向、超细晶组织和高密度位错，导致渗碳层深度增加，晶粒细化，促进孪晶马氏体和高密度位错的形成。渗碳层中的碳化物。此外，SFPB预处理提高了渗碳层的表面显微硬度、最大残余压应力和磨损率，这归因于孪晶马氏体的形成，