Estimation of fracture toughness of nitride compound layers on tool steel by application of the Vickers indentation method
Estimation of fracture toughness of nitride compound layers on tool steel by application of the Vickers indentation method
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DOI：
10.1016/j.surfcoat.2005.11.077
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发表时间：
2006-09
影响因子：
5.4
通讯作者：
D. Nolan;V. Leskovšek;M. Jenko
中科院分区：
文献类型：
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作者：
D. Nolan;V. Leskovšek;M. Jenko
氮化和氮碳共渗处理是提高工具钢和模具钢耐磨性能的公认方法。然而，我们的氮化工艺参数之间的关系，显微组织和断裂行为的表面层的理解是远远不够的。本文介绍了维氏压痕断裂试验在氮化和氮碳共渗AISI H11热作工具钢中的应用。采用光学显微镜和显微硬度计对复合层和扩散层的结构和力学性能进行了表征。结果表明，在一个足够厚的化合物层已经形成，这种方法有可能被施加作为一个伪非破坏性的方法，监测实际工具零件上的处理表面的断裂性能。然而，该方法的有效性似乎是化合物层的存在和厚度的函数，并且可能是扩散层的机械性能，并且提出了进一步的工作来建立断裂韧性计算的方法的灵敏度。
Nitriding and nitrocarburizing treatments are established methods of improving the wear performance of tool and die steels. However, our understanding of the relationship between nitriding process parameters, and microstructure and fracture behaviour of the surface layers is far from complete. This paper describes an investigation of the application of Vickers indentation fracture testing to nitrided and nitrocarburized AISI H11 hot work tool steel. Optical microscopy and microhardness testing were used to characterize structure and mechanical properties of the compound and diffusion layers. The results show that, where a sufficiently thick compound layer has formed, this method has the potential to be applied as a pseudo non-destructive method of monitoring the fracture properties of treated surfaces on actual tool parts. However, the validity of the method appears to be a function of the presence and thickness of the compound layer, and possibly the mechanical properties of the diffusion layer, and further work is proposed to establish the sensitivity of the method for fracture toughness calculations.