成分波动对17CrNiMo6齿轮钢渗碳速率及硬度的影响

The Effect of Composition Fluctuations on the Carbonization Rate and Hardness of 17CrNiMo6 Gear Steel

  • 摘要: 本研究基于17CrNiMo6齿轮钢锻件批量化生产中的成分波动特性,通过Deform-3D多物理场耦合仿真揭示了合金成分波动对其渗碳速率及硬度分布的影响机制。研究表明:碳扩散系数对成分波动的敏感度高于传递系数,成分差异仅在加热及渗碳初期具有显著影响;渗碳初期碳通量与初始碳含量呈现负相关性,下限含量试样的渗碳速率高于上限试样;齿根区域碳浓度梯度较齿廓高,但其空间差异与成分波动无显著关联;表层硬度一致性由渗碳工艺主导,而芯部硬度差异直接受控于成分波动;齿根硬度梯度较齿廓高,但其形成机制独立于成分波动。

     

    Abstract: This study is based on the compositional fluctuation characteristics in the mass production of 17CrNiMo6 gear steel forgings. Through Deform-3D multi physics coupling simulation, the influence mechanism of alloy compositional fluctuation on carburizing rate and hardness distribution is revealed. Research has shown that the sensitivity of carbon diffusion coefficient to compositional fluctuations is significantly higher than that of transfer coefficient, and compositional differences only have a significant impact in the early stages of heating and carburizing; The carbon flux during the initial stage of carburization shows a negative correlation with the initial carbon content, and the carburization rate of the lower limit sample is higher than that of the upper limit sample; The carbon concentration gradient in the root region is higher than that in the tooth profile, but its spatial differences are not significantly correlated with component fluctuations; The consistency of surface hardness is dominated by the carburizing process, while the difference in core hardness is directly controlled by compositional fluctuations; The gradient of tooth root hardness is higher than that of tooth profile, but its formation mechanism is independent of component fluctuations.

     

/

返回文章
返回