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本文对碳钢被覆金属碳化物过程中碳原子的迁移扩散行为进行了讨论。由于碳从基体向表面扩散形成碳化物,在基体与被覆层之间形成一假想的脱碳区△L,该区脱碳前的碳含量正好等于被覆层获得增量dl所需的碳原子总量。如果在被覆层获得增量dl的时间dt内,该区的碳能与远基体达到均匀化,则认为基体中的碳含量已足以维持被覆层的正常生长。本文对此进行了定量分析,导出了被覆金属碳化物钢中所需碳含量的数学表达式。
In this paper, the migration and diffusion behavior of carbon atoms in carbon steel coated with metal carbides are discussed. Since carbon diffuses from the substrate to the surface to form carbides, an imaginary decarburization region ΔL is formed between the substrate and the coating layer, the carbon content in the region just before decarburization is exactly equal to the total carbon atoms required for the coating layer to obtain the increment dl the amount. The carbon content in the matrix is considered to be sufficient to maintain normal growth of the coating if the carbon can be homogenized with the far matrix within the time dt at which the coating gains delta dl. In this paper, a quantitative analysis was conducted to derive the mathematical expression for the carbon content in the metal clad steel.