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氮在Fe、C、N三元系合金的共析温度附近(约565℃)渗入金属表面可得到氮化层,这是一种强化金属表面的化学热处理。经氮化处理后的金属表面硬度、耐磨性、抗胶合性大为提高;工件表面的残余应力属于压应力,致使工件的抗疲劳强度增高;处理的温度较低,引起的热变形很小。因此很适用于形状复杂,需高硬度,在交变应力下工作的零件。目前“氮化”工艺在国内外普遍采用着。
Nitrogen infiltration into the metal surface near the eutectoid temperature of Fe, C, N ternary alloys (about 565 ° C) results in a nitrided layer, which is a chemical heat treatment of a strengthened metal surface. After nitriding the metal surface hardness, wear resistance, anti-adhesion greatly improved; residual stress on the workpiece surface are compressive stress, resulting in increased fatigue strength of the workpiece; processing temperature is low, causing thermal deformation is small . Therefore, it is suitable for complex shape, high hardness, working under alternating stress. At present, “nitriding” process is widely used at home and abroad.