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对调质后的4Cr5MoSiVl钢进行强力喷丸处理,将喷丸处理后的试样在520℃下离子渗氮1 h。采用光学显微镜、透射电子显微镜、显微硬度仪和X射线衍射仪对比分析了喷丸和未喷丸试样亚表层的显微组织、渗层深度、硬度分布及表面物相组成。结果表明,在520℃离子渗氮l h的情况下,喷丸的催渗效果十分明显,喷丸后渗氮层深度从31.6μm增至52.5μm,表面层显微硬度从986 HV增加到1084 HV。喷丸试样的渗氮层与未喷丸试样相比,表面物相及含量都有不同。
After quenched and tempered 4Cr5MoSiVl steel peening treatment, the peening sample after nitriding at 520 ℃ nitriding 1 h. The microstructure, depth of penetration layer, hardness distribution and surface phase composition of the sub-surface layer of shot peening and non-shot peening were analyzed by optical microscope, transmission electron microscope, microhardness tester and X-ray diffractometer. The results show that the effect of shot peening is evident when the ion nitriding is performed at 520 ℃ for 1 h, the nitriding depth increases from 31.6 μm to 52.5 μm after shot peening, and the microhardness of the surface layer increases from 986 HV to 1084 HV . The nitrided layer of shot peening sample has different surface phases and contents compared with the non-shot peening sample.