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本文对20CrMnTi钢经离子硫碳氮、液体硫碳氮、气体软氮化处理后的疲劳强度进行了比较。并对疲劳前后的硬度变化、疲劳断口形貌、疲劳源的位置及过渡层的强度等问题进行了分析讨论。提出经离子硫碳氮共渗后,能增加渗层深度,提高过渡层强度,使疲劳源位置向心部推移,有效地提高了20CrMnTi钢的疲劳强度和超负荷持久性能。
In this paper, the fatigue strength of 20CrMnTi steel after being treated by ionized sulfur, carbon and nitrogen, liquid sulfur, carbon and nitrogen, and gas nitrocarburizing were compared. The changes of hardness before and after fatigue, the appearance of fatigue fracture, the location of fatigue source and the strength of transition layer were analyzed and discussed. It is proposed that after ionized sulfur carbonitriding, the depth of the infiltration layer can be increased, the strength of the transition layer can be increased, and the position of the fatigue source can be moved toward the heart, which effectively improves the fatigue strength and overload durability of 20CrMnTi steel.