耐磨料磨损性能优异的超细晶材料显微组织形成机理

At present, the research of wear behavior of ultrafine-grained materials has been debated. Wear mechanism is still unclear. We found that though ultrafine-grained materials have high hardness，a high work-hardening degree is essential for good abrasive wear resistance. Some studies have indicated that the low wear resistance of ultrafine-grained alloys is attributed to the lack of work hardening due to the disappointingly low ductility. In this work, an ultrafine-grained low alloy steel with with high hardness and high ductility will be produced by multi-directional forging and heat treatment. It is expected there will be an improved abrasive wear resistance because of high hardness and high work hardening capability. This proposed research will study the relation between the microstructure and the recrystallization by recrystallization thermodynamic, investigate effect and mechanism of the microstructure, hardness, ductility, work hardening, multi-directional forging and heat treatment on abrasive wear behavior in ultrafine-grained materials, and reveal the formation mechanism of microstructure of ultrafine-grained materials with excellent abrasive wear resistance. Results of this research not only will help enrich tribology theory, but also provide theoretical basis to develop and apply ultrafine-grained materials with excellent abrasive wear resistance.

目前关于超细晶材料的磨损行为的研究没有形成一致的观点，磨损机理尚不清楚。我们前期研究发现，超细晶材料即使已具有高硬度，仍需具有强的加工硬化能力，才具有优良的耐磨料磨损性能。已有研究也表明，超细晶材料尽管硬度及强度高，但塑性低导致加工硬化能力弱因此造成超细晶材料的耐磨性变差。本项目以多向锻造及热处理加工低合金钢，获得硬度高且塑性优良的超细晶低合金钢，使其硬度高且加工硬化能力强，增强耐磨料磨磨损性能。本研究将运用再结晶热力学理论研究显微组织与再结晶之间的相互制约关系，探索超细晶材料的微观组织、硬度、塑性、加工硬化、多向锻造及热处理对磨料磨损行为的影响规律与机制，揭示耐磨料磨损性能优异的超细晶材料显微组织形成机理。本项目的研究不仅有助于丰富摩擦学理论，而且为开发应用耐磨料磨损性能优异的超细晶材料提供理论依据。

近年来，关于超细晶材料的磨损行为的研究没有形成一致的观点，磨损机理尚不清楚。我们前期研究发现，超细晶材料即使已具有高硬度，仍需具有强的加工硬化能力，才具有优良的耐磨料磨损性能。已有研究也表明，超细晶材料尽管硬度及强度高，但塑性低导致加工硬化能力弱因此造成超细晶材料的耐磨性变差。本项目以多向锻造及热处理加工低合金钢，获得硬度高且塑性优良的超细晶低合金钢，使其硬度高且加工硬化能力强，增强耐磨料磨磨损性能。本研究运用再结晶热力学理论研究显微组织与再结晶之间的相互制约关系，探索超细晶材料的微观组织、硬度、塑性、加工硬化、多向锻造及热处理对磨料磨损行为的影响规律与机制，揭示耐磨料磨损性能优异的超细晶材料显微组织形成机理。本项目的研究不仅有助于丰富摩擦学理论，而且为开发应用耐磨料磨损性能优异的超细晶材料提供理论依据。