表面纳米化对45钢硼铬稀土低温共渗的影响  

Effects of Surface Nano-crystallization Treatment on RE-Chrome-Boronizing of Steel 45 at Low Temperature

作　　者：蔡玉成 许斌[1] 袁兴栋[1] 温振兴[1] 

机构地区：[1]山东建筑大学材料科学与工程学院,山东济南250101

出　　处：《热加工工艺》2014年第10期170-172,共3页Hot Working Technology

摘　　要：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-Cx6h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1200-1700HV，共渗层主要由单相Fe2B组成。The technology of fast multiple rotation rolling （FMRR） was used to proceed nano-crystallization treatment on the surface of steel 45, and then the sample was treated by RE-chrome-boronizing at 650 ℃ for 6 h. The surface layer was analyzed by means of TEM, SEM and electron microscopic hardness tester. The results show that the treatment of FMRR causes severe plastic deformation, nanocrystal and high density dislocation structure on the surface of steel 45. The thickness of deformation layer is about 30μm, and the hardness is 40% higher than that of the matrix. The RE-chrome-boronizing layer is relatively continuous without obvious comb-shape characterisitic and the depth is 27 μm. The hardness is about 1200 HV to 1700 HV, which indicates that the layer is mainly constituted by one phase of Fe2B.

关 键 词：快速多重旋转碾压 表面纳米化 硼-铬-稀土共渗 硬度 

分 类 号：TG156.87[金属学及工艺—热处理]