硼锆共渗层在磨粒和冲击疲劳磨损时的磨损行为(英文)

本文研究了5CrMnMo钢的硼锆共渗层与渗硼层在磨粒和冲击疲劳磨损试验时的磨损行为。结果表明,在磨粒和冲击疲劳磨损条件下,共渗层的耐磨性比渗硼层的优越,其因在于共渗层脆性比渗硼层的低。共渗与渗硼后经等温淬火的试样比不经等温淬火的试样,其冲击疲劳下的耐磨性得到明显地改善,可认为是残余应力降低与过渡区强化的结果。本试验中的磨损机制,磨粒磨损是塑性变形与犁削机制,冲击疲劳磨损则是冲击疲劳、滑动与磨粒磨损的复合机制。

THE WEAR BEHAVIOUR OF BORON-ZIRCONIZING LAYER DURING ABRASIVE AND IMPACT FATIGUE WEAR

The paper deals with the wear behaviour of boron-zirconizing layer and boronizing layer of 5CrMnMo steel during abrasive and impact fatigue wear tests. The results show that the wear resistance of the boron-zirconizing layer is superior to that of the boronizing layer under both abrasive wear and impact fatigue wear conditions. The reason is that the brittleness of the boron-zirconizing layer is lower than that of the boronizing layer. Both the boronized sample and the boron-zirconized sample were quenched isothermally. Their impact fatigue wear resistance can be improved evidently by comparison with that of the same sample without the same processing of isothermal quenching. The result obtained is considered to be the diminution of the residual stress and the strengthening of the transition zone. The wear mechanism, in the present paper, indicates that the behaviur of abrasive wear is operated by plastic deformation and ploughing, and that of impact fatigue wear by a compound mechanism which involves impact fatigue, slide and abrasive.