BH催渗工艺对12CrNi3渗碳钢组织和性能的影响

针对12CrNi3钢薄壁齿轮气体渗碳工艺存在温度高、周期长、畸变大的弊端,导致薄壁重载齿轮组织状态不佳,畸变不受控等问题,在原超级渗碳工艺的基础上添加BH-5催渗剂,开展BH催渗试验。结果表明,当渗碳层深为(1.5±0.1) mm时,BH渗碳可提升效率20%以上;使用BH催渗使12CrNi3钢渗碳后晶粒度达到7级,渗层硬度梯度下降更平缓,摩擦性能提高,畸变减小。

Effect of BH carburizing process on structure and properties of 12CrNi3 carburizing steel

Aiming to overcome the disadvantages of gas carburizing for thin-walled heavy-duty gears such as requiring high temperature and long process period, as well as uncontrollable large distortions and undesired microstructure, the BH carburizing process was adopted by adding BH-5 energizing agent based on the original gas carburizing process. The results show that when the carburized layer depth is (1.5±0.1) mm, the BH carburizing can improve the carburizing efficiency by more than 20%. The BH carburizing can refine the grain size of 12CrNi3 steel to grade 7, result in smoother hardness gradient for the carburized layer, improve friction performance, and reduce distortions.