论文部分内容阅读
采用有限元法,模拟了用渗碳-脱碳化学热处理和外加涂层制备的新型金属结构材料中碳原子的扩散情况以及最终的碳浓度分布,分析了涂层尺寸对碳浓度分布的影响。结果表明,在涂层尺寸为0.4～0.5mm的条件下,渗碳过程中当外界碳势为1.48%(质量分数)、传质系数为1.34×10~(-7)m/s时或脱碳过程中当外界碳势为0%(质量分数)、传质系数为1×10~(-7)m/s时,材料比较容易获得外软内硬的力学性能。薄膜尺寸分别为0.4mm和0.5mm时,渗碳时间为900～1000s和1300～1400s,相应的脱碳时间为1800～1900s和2200～2300s时可获得最佳的扩散效果。
The finite element method was used to simulate the carbon atom diffusion and the final carbon concentration distribution in the new metal structure materials prepared by carburizing-decarburization chemical heat treatment and additional coating. The influence of coating size on the carbon concentration distribution was analyzed. The results show that when the size of carbon coating is 0.4 ~ 0.5mm, the carbon potential is 1.48% (mass fraction) and the mass transfer coefficient is 1.34 × 10 ~ (-7) m / s When the external carbon potential is 0% (mass fraction) and the mass transfer coefficient is 1 × 10 ~ (-7) m / s in the carbon process, it is easier to obtain the mechanical properties of the outer soft inner hard. When the film size is 0.4mm and 0.5mm respectively, the carburizing time is 900 ~ 1000s and 1300 ~ 1400s, the best diffusion effect is obtained when the corresponding decarburization time is 1800 ~ 1900s and 2200 ~ 2300s.