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低碳合金结构钢经渗碳或渗氮、碳氮共渗后,表面硬度,耐磨性以及疲劳强度等性能均可以得到很大的提高。然而提高材料表层的强度会增加其缺口敏感性是渗碳钢的不足之处。采用叠加滚压强化的方法,不仅提高表层的强度且减小应力集中的敏感性。本文研究了18CrMnTi及25MnTiBRe等低碳合金钢经碳氮共渗直接淬火、低温回火后再施以表面滚压形变强化,研究其缺口疲劳强度与表面应力状态,微观组织结构的变化规律。
Low-carbon alloy steel by carburizing or nitriding, carbonitriding, the surface hardness, wear resistance and fatigue strength and other properties can be greatly improved. However, increasing the strength of the material surface will increase the gap sensitivity of carburizing steel is inadequate. Adopting the superposition rolling method, not only improve the surface strength and reduce the stress concentration sensitivity. In this paper, the low carbon alloy steels 18CrMnTi and 25MnTiBRe were directly quenched by carbonitriding, and then subjected to surface rolling deformation strengthening after low temperature tempering. The variation of notch fatigue strength, surface stress and microstructure were studied.