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首页> 外文会议>ASME international manufacturing science and engineering conference 2011 >FATIGUE BEHAVIOR, BRIDGING STRESSES, AND FATIGUE RELIABILITY IN SILICON NITRIDE CERAMICS
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FATIGUE BEHAVIOR, BRIDGING STRESSES, AND FATIGUE RELIABILITY IN SILICON NITRIDE CERAMICS

机译：氮化硅陶瓷的疲劳行为，桥接应力和疲劳可靠性

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摘要

Silicon nitride ceramics doped with rare-earth oxides exhibit excellent hardness, toughness, and strength at elevated temperatures making them attractive materials for replacing cemented carbides in a variety of manufacturing applications such as cutting and rolling tools. One recent example is the application of rolling of high strength alloy wires from steels and nickel-based super-alloys where cemented carbide rolls suffer wear and thermal fatigue cracking, leading to a degradation of wire quality. [1] Furthermore, it has been shown that under moderate loading silicon nitride rolls can give >10 times longer life and improved wire surface quality. [1] However, it has also been shown that the rolls can suffer fatigue failure at higher loadings, for example when rolling wires with high deformation resistance such as the super alloy wire Nicrofer S7020. [1-2] Accordingly the aim of this study is the develop a design tool for predicting the fatigue failure of silicon nitride ceramics.The silicon nitrides with favorable mechanical properties have microstructures with elongated p-phase grains and a glassy intergranular film. The weak film encourages intergranular fracture allowing the formation of grain bridges across the crack wake which helps to reduce the stress intensity felt at the crack tip, K_(lip).
机译：掺有稀土氧化物的氮化硅陶瓷在高温下具有出色的硬度，韧性和强度，使其成为在各种制造应用中（例如切削和轧制工具）替代硬质合金的有吸引力的材料。最近的一个例子是从钢和镍基超级合金轧制高强度合金线的应用，其中硬质合金轧辊遭受磨损和热疲劳裂纹，导致线质量下降。 [1]此外，已经表明，在中等负荷下，氮化硅辊可以提供大于10倍的寿命，并改善了导线表面质量。 [1]然而，还显示出，例如当滚动具有高抗变形性的线材例如超合金线Nicrofer S7020时，在高负荷下辊会遭受疲劳破坏。 [1-2]因此，本研究的目的是开发一种预测氮化硅陶瓷疲劳破坏的设计工具。具有良好机械性能的氮化硅具有微观结构，具有细长的p相晶粒和玻璃态晶间膜。薄弱的薄膜促进了晶间断裂，从而允许在裂纹后部形成晶粒桥，这有助于减小裂纹尖端K_（唇）处的应力强度。

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