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Fatigue mechanics of carbide composites

机译:碳化物复合材料的疲劳力学

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The present article is an overview of mechanical degradation during monotonic and cyclic loading of powder composite materials based on the tungsten- and titanium carbides, also known as hardmetals and cermets. Heterogeneous structure of powder metallurgy (PM) hardmetals and cermets make its difficult to predict their mechanical properties. The TiC-based cermets (with Fe/Ni binder) were tested and results are compared with that of conventional WC-Co hardmetal grades. The three-point bending cyclic and surface fatigue tests are performed in order to define fatigue properties of studied materials. Fatigue crack developments during testing are analysed by scanning electron microscopy (SEM). On the bases of received experimental results and fracture analysis, fatigue failure mechanisms are developed. New numerical model for prediction of fatigue properties is proposed. Tungsten-free composites (cermets) are prospective candidates to replace the hardmetals in metalforming operations (especially blanking of sheet metals). Comparative studies are shown the superiority of the cermets over ordinary hardmetals.
机译:本文概述了基于碳化钨和碳化钛(也称为硬金属和金属陶瓷)的粉末复合材料在单调和循环加载过程中的机械降解情况。粉末冶金(PM)硬质合金和金属陶瓷的异质结构使其难以预测其机械性能。测试了基于TiC的金属陶瓷(具有Fe / Ni粘结剂),并将结果与​​常规WC-Co硬质合金等级进行了比较。为了确定研究材料的疲劳性能,进行了三点弯曲循环和表面疲劳测试。通过扫描电子显微镜(SEM)分析测试过程中的疲劳裂纹发展。在收到实验结果和断裂分析的基础上,建立了疲劳破坏机理。提出了一种新的疲劳性能预测数值模型。无钨复合材料(金属陶瓷)是替代金属成形操作中的硬金属(特别是钣金的冲裁)的潜在候选者。比较研究表明,金属陶瓷比普通硬质合金具有优越性。

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