结构钢经氮化处理后可以视作一种复合材料,其心部为中等强度、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心部材料的可塑性,主要是决定于氮化层的可塑性。氮化层抑制心部的塑性变形,从而起着强化作用。当氮化层破裂时,这种强化作用随之消失。另一方 Structural steel after nitriding treatment can be regarded as a composite material, the center of the medium strength, high toughness of quenched and tempered steel, surrounded by a thickness of 0.25 to 0.50 mm, high surface hardness, brittleness nitride shell Surrounded. The plastic deformation of this composite material does not determine the plasticity of the core material, mainly due to the plasticity of the nitride layer. Nitride layer inhibition of the plastic deformation of the heart, which play a reinforcing effect. When the nitride layer ruptures, the strengthening effect disappears. The other party