Effect of carbon content on the microstructure and mechanical properties of superfine Ti(C, N)-based cermets
Effect of carbon content on the microstructure and mechanical properties of superfine Ti(C, N)-based cermets
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DOI：
10.1016/j.matchar.2008.01.006
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发表时间：
2008-10
影响因子：
4.7
通讯作者：
N. Liu;Xuesong Liu;Xiaobo Zhang;Longwei Zhu
中科院分区：
文献类型：
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作者：
N. Liu;Xuesong Liu;Xiaobo Zhang;Longwei Zhu
Ti（C，N）基金属陶瓷作为世纪70年代出现的一种新型刀具材料，由于具有许多优良的性能，近年来得到了广泛的应用。采用扫描电镜（SEM）、X射线能谱仪（EDX）和X射线衍射仪（XRD）研究了不同碳含量的Ti（C，N）基金属陶瓷的显微组织。还测量了维氏硬度和横向断裂强度（TRS）。碳含量的增加导致晶粒尺寸变细，粘结相中钨和钼的固溶强度降低，重（Ti，Mo，W）（C，N）芯的体积分数增加。加入碳量过少或过多都会使材料的相组成偏离正常的双相区，导致第三相的形成：碳量过低时形成η相，碳量过高时形成游离碳。第三相的形成会显著降低金属陶瓷的力学性能。
As a new kind of tool materials which appeared in the seventies last century, the Ti (C, N)-based cermets have been widely used in recent years due to many of its good properties. The microstructure of Ti(C, N)-based cermets with various carbon content were studied using scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffractometry (XRD). Vickers hardness and transverse rupture strength (TRS) were also measured. An increased carbon content resulted in the finer grain size, decreased solution strength of tungsten and molybdenum in the binder phase, and a higher volume fraction of heavy (Ti, Mo, W)(C,N) cores. If the addition of carbon content is too little or too much, the phase composition of material will deviate from the normal dual phase section and lead to the formation of the third phase: η-phase if the carbon content is too low or dissociative carbon if the carbon content is too high. And the formation of the third phase will remarkably deteriorate the mechanical properties of cermets.