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采用快速多重旋转技术(FMRR)对45钢进行表面纳米化处理,然后对其进行650℃×6 h的硼铬稀土低温共渗,并利用TEM、SEM、电子显微硬度计进行表征。结果表明:快速多重旋转技术处理后的45钢表面发生了剧烈塑性变形,产生了纳米级晶粒,变形层厚度约30μm,硬度比基体提高40%;处理后的45钢表面硼铬稀土低温共渗层无明显的梳齿状、较为连续,平均厚度27μm,其硬度为1200~1700 HV,共渗层主要由单相Fe2B组成。
The surface nanocrystallization of 45 steel was carried out by FMRR. Then the steel was exposed to boron-chromium rare earth at 650 ℃ for 6 h. The microstructure was characterized by TEM, SEM and electron microhardness tester. The results show that the surface of 45 steel treated by rapid multi-rotation technique undergoes severe plastic deformation and produces nano-scale grains. The thickness of deformation layer is about 30μm, and the hardness is increased by 40% The infiltration layer has no obvious comb-tooth shape, and is relatively continuous with an average thickness of 27 μm and a hardness of 1200-1700 HV. The common diffusion layer mainly consists of single-phase Fe2B.