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结构钢经氮化处理后可以视作一种复合材料,其芯部为中等强度、韧性较高的调质钢材,周围由厚度为0.25—0.50毫米、表面硬度高、脆性大的氮化层外壳所包围。这种复合材料的塑性变形能力不决定于芯部材料的可塑性,主要是决定于氮化层的可塑性。氮化层抑制芯部的塑性变形,从而起着强化的作用。当氮化层破裂时,这种强化作用随之消失。另一方面,芯部材料反过来对氮化层起着支持作用。在一定程度内,支持作用
Structural steel after nitriding treatment can be regarded as a composite material, the core is medium strength, high toughness of quenched and tempered steel, surrounded by a thickness of 0.25-0.50 mm, high surface hardness, brittleness of the nitride shell Surrounded. The plastic deformation capacity of this composite material does not depend on the plasticity of the core material, mainly due to the plasticity of the nitride layer. Nitride layer inhibition of plastic deformation of the core, which play a reinforcing role. When the nitride layer ruptures, the strengthening effect disappears. On the other hand, the core material in turn plays a supportive role on the nitride layer. To a certain extent, supportive role