摘要
本文通过对深层渗硼渗层以及一些对比材料的冲蚀磨损实验,研究了渗硼层的冲蚀磨损性能及其机制。结果表明:渗硼层对于硬度比它低的磨粒(H_p/H_m≤1)具有优良的抗冲蚀磨损性能;但当H_p/H_m>1后,磨损率随磨粒硬度升高而迅速增大。渗硼层具有脆性材料的冲蚀磨损特征,即最大冲蚀磨损率发生在高冲击角处。在硬磨粒(Al_2O_3、SiC)冲蚀下,渗硼层冲蚀磨损主要是通过赫兹裂纹环扩展以及块状磨屑的脱落而引起的,低角冲击时也存在着犁沟机制。硬磨粒冲击还能导致表面局部熔化。在软磨粒冲击下,要经过多次冲击才能使小片磨屑脱落.SlO_2粒子冲击时,可使表面龟裂,但它不是冲蚀磨损的主要原因。
Through erosion experiments of thick boriding layers and other comparative materials, the erosion behavior and mechanism of the boriding layers were studied. The results showed that the boriding layers had high erosion resistance to media with lower hardness (H_p/H_(?)<1). However, to harder media (H_p/H_(?)>1), the erosion rates increased rapidly with increase of media hardness. The boriding layers had erosion characters of brittle materials, that is, erosion peak occurred at large impringement angle. The erosion mechanism of the boriding layers with harder abrasive media such as Al_2O_3 and SiC, were forming Hertz crack rings and detachment of flakes. Plowing occurred at low impringement angle. Impringement of harder abrasive media could cause local melting of the surface. Many times of impringement were needed to canse detachment of a chip. under condition of softer media. When impacted by SiO_2, the surface formed cracks, but, they were not the main reason of erosion.
出处
《金属热处理》
CAS
CSCD
北大核心
1989年第4期33-38,共6页
Heat Treatment of Metals
