最新色国产精品精品视频,中文字幕日韩一区二区不卡,亚洲有码转帖,夜夜躁日日躁狠狠久久av,中国凸偷窥xxxx自由视频

In this study, dense Co- and Ni-bonded Ti(C_0.6N_0.4) matrix cermets with secondary carbides, i.e., WC, Mo₂C, and NbC, were prepared using liquid phase sintering in vacuum for 60 min at temperatures ranging from 1410 to 1490°C. The detailed microstructural and phase analysis was performed using scanning electron microscopy, electron probe microanalysis, and X-ray diffraction analysis. The effect of sintering temperature on the microstructure, mechanical properties, and machining performance of cermets was investigated. The results showed that sintering temperature had a significant impact on the microstructural characteristics of (Ti, W, Mo, Nb)(C, N)-(Co, Ni) cermets. The total carbon content of cermets decreased with increase in temperature and a carbon-deficient phase (M₆C) was observed in the cermet sintered at 1490°C. The cermets sintered at temperatures of up to 1470°C were composed of an fcc solid solution metal binder and two types of core-rim structured grains, i.e., cubic carbide solution and cubic Ti(C, N) solution phases. The best machining performance on continuous / interrupted turning was found in the cermet sintered at 1470°C because of an optimum combination of hardness and transverse rupture strength.