Micro-abrasive wear test of niobium carbide layers produced on AISI H13 and M2 steels
Micro-abrasive wear test of niobium carbide layers produced on AISI H13 and M2 steels
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DOI：
10.1016/j.surfcoat.2005.05.037
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发表时间：
2006-04
影响因子：
5.4
通讯作者：
C.K.N. Oliveira;R. M. M. Riofano-R.-M.-M.-Riofano-93107674;L. Casteletti
中科院分区：
文献类型：
--
作者：
C.K.N. Oliveira;R. M. M. Riofano-R.-M.-M.-Riofano-93107674;L. Casteletti
通过在添加有铌铁和铝的熔融铝合金中于1000 °C下热反应沉积和扩散（TRD）处理4 h，在AISI H13和M2钢上产生非常硬和耐磨的层。采用光学显微镜、X射线衍射和维氏显微硬度对样品进行了分析。通过微磨料（球坑）磨损方法评价了层的耐磨性。还分析了未涂覆和离子氮化的AISI H13钢的磨损行为以进行比较。在AISI H13和M2钢上均能形成轮廓分明的层，具有出色的厚度规则性。根据X射线分析，这些层由碳化铌（NbC）组成。AISI H13钢的涂层厚度为6 μm，硬度为2333 HV 0.050，而AISI M2钢的涂层厚度为9 μm，硬度为2345 HV 0.050。NbC涂层的AISI H13的微磨料耐磨性显著高于未涂覆的AISI H13。与离子氮化H13试样相比，NbC层的耐磨性也有所提高。沉积在AISI H13和M2上的碳化铌层表现出相似的微磨料磨损行为。磨损表面分析表明，这些层的磨损机制是磨粒磨损：沟槽磨损和滚动磨损。
Very hard and wear resistant layers were produced on AISI H13 and M2 steels by TRD (thermoreactive deposition and diffusion) treatment in molten borax added with ferroniobium and aluminum, at 1000 °C for 4 h. Optical microscopy, X-ray diffraction and Vickers microhardness were used to analyze the samples. The wear resistances of the layers were evaluated by the micro-abrasive (ball-cratering) wear method. The wear behavior of the uncoated and ionitrided AISI H13 steel was also analyzed for comparison. Well-defined layers formed on both AISI H13 and M2 steels, with excellent thickness regularity. These layers consisted of niobium carbide (NbC) according to X-ray analyses. The AISI H13 steel presented a layer with thickness of 6 μm and hardness of 2333 HV0.050while the layer on AISI M2 steel measured 9 μm thickness and had a hardness of 2345 HV0.050. The micro-abrasive wear resistance of NbC coated AISI H13 was considerably higher than uncoated AISI H13. In comparison with ionitrided H13 sample, the NbC layer also was more wear resistant. The niobium carbide layers deposited on AISI H13 and M2 presented similar micro-abrasive wear behavior. Worn surfaces showed that the wear mechanism in these layers was abrasive wear: grooving abrasion and rolling abrasion.