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采用表面机械研磨处理(SMAT)在304不锈钢表面形成纳米晶粒表层,对粗晶粒和表面纳米化的304不锈钢试样采用一种较为环保的新型介质在450℃进行氮碳共渗(分别标记为CG-NC和SNC-NC试样)。结果表明,氮碳共渗的两种试样表面光滑,表层主要由含氮的S相组成,但SNC-NC试样仍保留纳米晶粒的表面结构。SNC-NC试样的氮原子扩散深度(13.3μm)、硬度(1040 HV0.05)和耐磨性都高于CG-NC试样(8.2μm,780 HV0.05)。
A nanocrystalline surface was formed on the surface of 304 stainless steel by surface mechanical grinding (SMAT). Nitrocarburizing was carried out at 450 ℃ for the coarse grains and the surface-nanocrystallized 304 stainless steel specimens For the CG-NC and SNC-NC samples). The results show that the two samples of nitrocarburizing have a smooth surface and the surface layer mainly consists of S phase containing nitrogen. However, the surface structure of the nanocrystalline grains remains in the SNC-NC sample. The nitrogen diffusion depth (13.3μm), hardness (1040 HV0.05) and wear resistance of SNC-NC samples were higher than that of CG-NC samples (8.2μm, 780 HV0.05).