高速钢析出的纳米碳化物对刀具使用寿命的影响

研究了高速钢刀具在超低温处理工艺条件下基体组织析出纳米碳化物结构的相变过程。析出的纳米结构不仅强化了刀具基体组织,显著增加了刀具的耐磨性,而且大幅度提高了切削刀具的使用寿命,表现出纳米结构特殊的物理力学性能。在超低温温度场中,钢组织结构的转变是随机、超显微的,而且是一种逐渐的转变过程。以钢的"磨损量-时间"关系建立起高速钢超低温工艺条件下的组织结构转变特性图,为指导、制订出各种高速钢切削刀具的超低温处理工艺规范提供了理论依据。

Influence of the nanocarbide separated from the matrix of high speed steel upon the life of cutting tools

This paper deals with the phase transformation process in which the nanocarbide structure is separated from the matrix of high speed steel (HSS) tools in the cryogenic technological conditions. As the separated nanostructure strengthens the tool's matrix structure,the tool's abrasion resistance is increased obviously and the cutting tool's life raised greatly,which demonstrates the specific physical and mechanical properties of the nanostructure. In the cryogenic temperature field,the change of steel structure is random and ultramicroscopic,and it is also a kind of progressive changing process. The characteristic chart of HSS's structure change is established based on the relationship between steel's wearing capacity and time in the cryogenic technological conditions. The result provides a theoretical basis for guiding and working out the cryogenic treatment technological standard of various HSS cutting tools.