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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。
In this paper, the erosive wear behavior of boronized layer and its mechanism are studied through the erosion abrasion experiments of deep boriding layer and some comparative materials. The results show that the boronizing layer has excellent erosion and abrasion resistance to abrasive grains with lower hardness (H_p / H_m≤1). However, when H_p / H_m> 1, the wear rate rapidly increases with the increase of abrasive hardness Big. Boronizing layer with brittle material erosion wear characteristics, that the maximum erosion wear rate occurs at high impact angle. Under the erosion of hard abrasive grains (Al 2 O 3, SiC), the erosive wear of boronizing layer is mainly caused by the expansion of Hertzian crack ring and the shedding of massive wear debris. Furrow mechanism also exists in low angle impact. Hard abrasive impact can also result in partial melting of the surface. Under the impact of the soft abrasive particles, it is necessary to make several impacts to make the small pieces of abrasive particles come off.SlO 2 particles can crack the surface when they impact, but it is not the main reason of erosion wear.