DC53钢渗硼处理对45钢摩擦影响层组织演化的影响

Effect of boronizing of DC53 steel on microstructure evolvement in sliding friction-induced deformation layer of 45 steel

采用销盘摩擦磨损试验机研究了DC53钢渗硼处理对对摩副45钢摩擦影响层组织演变的影响。通过SEM、XRD、SIMS、TEM等分析了45钢摩擦影响层的微观组织特征。结果表明,渗硼处理显著提高了DC53钢盘试样的表层显微硬度,降低了摩擦副的摩擦系数及其自身的磨损率;对摩副渗硼的45钢销试样的摩擦影响层由塑性变形层和剥离层组成,而对摩副未处理的45钢销试样的摩擦影响层仅包括塑性变形层;对摩副中的Cr、Mo及B元素扩散到了45钢销试样的摩擦表层,且在对摩副渗硼的销试样中的扩散深度大于在对摩副未处理的销试样中的扩散深度;对摩副渗硼的45钢销试样的摩擦表层的晶粒明显细化。

The effect of boronizing of DC53 steel on microstructure evolvement in sliding friction-induced deformation layer （SFIDL） of 45 steel was investigated by a pin-on-disc wear tester. The mierostructure characteristics of the SFIDL was investigated by means of scanning electron microscopy （SEM）, X-ray diffraction （XRD）, secondary ion mass spectrometry （SIMS） and transmission electron microscopy （TEM）. The results show that boronizing increases the surface mierohardness of DC53 steel and thus decreases the friction coefficient of tribopairs and its mass loss. The SFIDL of the 45 steel pin beneath the worn surface against the boronized disc includes two layers, which are unpeeling delamination layer and a plastically deformed layer, while only one layer expect unpeeling delamlnation layer is observed for 45 steel pin against unboronizing discs. Cr, Mo and V elements in mating material diffuse into the friction-induced deformation layer of 45 steel pin samples. Moreover, the depth of elements for 45 steel pin against boronizing disc is larger than that for 45 steel pin against unboronizing disc. The ferrite grains in the worn layer of the 45 steel pin against boronizing disc are ultra-fined.