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研究W18Cr4V钢在氨加甲醇裂化气气氛中进行的控制氮势软氮化问题。导出了气氛的氮势与氢分压的关系式,测定了该钢种在550℃氮化时的氮势门槛值,并得出了相应的曲线。试验结果表明,这种气氛的氮势可通过氢导仪有效地控制在0.2～0.4。提高氮势可促使白层形成,提高渗层硬度和耐磨性,但使其脆性增高。生产实践证明,低氮势控制氮化可显著提高高速钢刀具的使用寿命。
In this paper, we studied the control of nitrogen potential nitriding in W18Cr4V steel in ammonia-methanol cracked gas atmosphere. The relationship between nitrogen potential and partial pressure of hydrogen was deduced. The threshold value of nitrogen potential at 550 ℃ was measured and the corresponding curve was obtained. The experimental results show that the nitrogen potential of this atmosphere can be effectively controlled by hydrogen conductivity meter at 0.2 ~ 0.4. Increasing the nitrogen potential can promote the formation of white layer, improve the hardness and wear resistance of the layer, but to increase its brittleness. Production practice has proved that low nitrogen potential nitriding can significantly improve the service life of high-speed steel cutting tools.