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本文用45及45VS钢研究了室温形变对离子渗氮及气体渗氮的影响,并结合室温形变后再加热时所发生的回复与再结晶过程进行了讨论。结果得出:室温形变后,在再结晶温度以下渗氮时,形变能促进渗氮,使渗氮层厚度增加,硬度升高。影响程度决定于回复再结晶后保留的冷形变效果。渗氮温度愈低,促进作用愈大;随形变量增加,影响效果先增后减,这是因为形变量大时易于发生再结晶。在再结晶温度以上渗氮时,虽然由于再结晶而使心部硬度较未形变的低并使渗层减薄,但却使渗层硬度升高,这是因为在再结晶还未发生前氮已渗入表层提高了表层再结晶温度,并使渗层硬度得到提高。上述结果阐明了形变渗氮能提高性能的原因。
In this paper, the effect of room temperature deformation on ion nitriding and gas nitriding was studied by using 45 and 45VS steel. The process of recovery and recrystallization occurred after room temperature deformation and reheating were discussed. The results show that after deformation at room temperature, nitriding under the recrystallization temperature can promote nitriding, so that the thickness of nitrided layer increases and the hardness increases. The degree of influence depends on the cold deformation effect retained after recrystallization. The lower the nitriding temperature is, the greater the promoting effect is. With the increase of the deformation variable, the effect increases first and then decreases, which is because recrystallization is easy to happen when the deformation amount is large. At nitriding above the recrystallization temperature, although the hardness of the core is lower due to recrystallization than the non-deformable and the layer is thinned, the hardness of the layer increases, because before recrystallization the pre-nitrogen Has infiltrated the surface to improve the surface recrystallization temperature, and make the hardness of the infiltration layer is improved. The above results clarify the reason why the deformation nitriding can improve the performance.