断裂失效造成的经济损失是巨大的,而疲劳断裂占断裂失效的70％～80％,因此研究材料疲劳强度的强化途径具有重大的经济意义。提出了常用合金结构钢、渗碳钢、低合金高强度钢及球墨铸铁等材料,经整体热处理或表面化学热处理后,再复合以3500MP,滚压力进行形变强化,有针对性的研究了其强化规律与疲劳强度的关系。研究指出:(1)复合强化是发挥材料疲劳强度潜力的有效途径;(2)可使高强度钢的σ—1n/σ_b仍保持线性关系;(3)提出了采用局部形变强化,克服零件的薄弱环节,使零件各部位的材料疲劳强度接近等强度设计的技术观点。并从断裂力学与表面微观组织结构的变化以及残余压应力等因素的有益作用探讨了强化机制。复合强化工 The economic loss caused by fault failure is huge, and the fatigue fracture accounts for 70% -80% of the fault failure. Therefore, it is of great economic significance to study the enhancement of fatigue strength of materials. The common alloy structural steel, carburizing steel, low alloy high strength steel and ductile iron are proposed. After the whole heat treatment or surface chemical heat treatment, they are recombined with 3500MP and the rolling force is used for deformation strengthening. Relationship between regularity and fatigue intensity. The research shows that: (1) The composite strengthening is an effective way to exert the potential of material fatigue strength; (2) the σ-1n / σ_b of the high strength steel can maintain the linear relationship; (3) Weak links, so that parts of the material fatigue strength similar to the strength of the design point of view of technology. The strengthening mechanism was also discussed from the beneficial effects of fracture mechanics, surface microstructure changes and residual compressive stress. Compound strong chemical industry