【摘要】 疲劳是导致硬质合金材料失效和断裂的主要原因,所以研究硬质合金的疲劳性能,对于提高硬质合金的使用性能具有重要的指导意义。疲劳失效机理众多,但研究硬质合金静态疲劳的文献却相对较少,本文简要的介绍了近年来国内外在硬质合金静疲劳领域的一些研究成果。首先从断口微观形貌、应力比R及频率和相应的裂纹扩展公式来进行对比,区分了循环断裂和静态断裂两种疲劳裂纹扩展模式。围绕最能影响硬质合金静疲劳性能的参数最大应力场强度因子Kmax,从材料微观形貌、应力比、温度、频率及其他环境因素分析和讨论影响硬质合金静态疲劳性能的工艺参数。以期让读者更清楚的了解了硬质合金的静态疲劳性能,为进一步认识硬质合金疲劳失效机理和评估材料抗疲劳特性提供一定的参考。更多还原

【Abstract】 Fatigue is the main reason of failure and fracture for cemented carbide, so the research on the fatigue performance of cemented carbide has important guiding significance for improving its service performance. Many fatigue failure mechanisms have been investigated, but the research on the static fatigue for cemented carbide is relatively less.The research progresses on the static fatigue of cemented carbide at home and abroad in recent years are briefly introduced. Two fatigue crack growth models of static fracture and cycle fracture are distinguished from comparing the fracture morphology, stress ratio R, frequency and corresponding crack growth formulas. The factor of maximum stress intensity Kmaxis the key parameter affecting the static fatigue performance of cemented carbide. The technological parameters influencing the static fatigue properties are analyzed and discussed from the material microstructure, stress ratio, temperature, frequency and other environmental factors. Thus some references are provided for further understanding the fatigue failure mechanism of cemented carbide and evaluating the fatigue resistance of materials.更多还原