Development of Cemented Carbide for Tools
Development of Cemented Carbide for Tools
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工具用硬质合金的开发
DOI：
10.2497/jjspm.62.471
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Y. Kubo
中科院分区：
文献类型：
--
作者：
Y. Kubo
1.采用0.4微米WC粉末，通过烧结和热等静压工艺制备WC-0.40mass%VN-0.44mass%Cr3C2-8.0mass%Co合金。在这些合金中观察到痕量的富V相。富V相的定量如下进行。 (1)利用EPMA和FE-SEM确定富V相的位置。 (2)通过FIB进行切断并制作薄膜，并通过FE-TEM观察确定富V相的尺寸。 (3)通过将FE-TEM的尺寸与EPMA线分析的峰宽度一致来设定阈值。 (4)通过阈值对EPMA V映射图像进行二值化，并通过图像分析获得面积％。中碳合金中富V相的含量为0.008面积％，且随着碳含量从0.001面积％增加到0.051面积％，富V相的含量增加。 2.通过DTA测量分析了WC-31质量％Co合金的熔化开始和熔化范围。它们受碳含量的影响显着，低碳合金和高碳合金的熔化开始温度分别为1641 K和1571 K。添加Cr或V显着降低熔化开始，特别是对于添加Cr的高碳合金。在凝固过程中组合添加 Cr 和 V 的情况下，有两个峰表明两步凝固。
1. WC-0.40 mass%VN-0.44 mass%Cr3C2-8.0 mass%Co alloys using 0.4 micron WC powders were prepared by sintering and HIPing. In these alloys trace amount of V-rich phase were observed. Quantification of V-rich phases was performed as follows. (1) The location of V-rich phase was determined by EPMA and FE-SEM. (2) Cutting off and making thin film was done by FIB and determination of the size of V-rich phase was carried out by FE-TEM observation. (3) The threshold value was set by coincidation of the size by FE-TEM with peak width of EPMA line analysis. (4) EPMA V mapping image was binarized by the threshold value and area % was obtained by image analysis. The amount of V-rich phase in middle carbon alloy was 0.008area% and the amount of V-rich phase increased with increasing carbon content from 0.001 to 0.051area%. 2. The start of melting as well as melting range in WC-31 mass%Co alloys were analysed by DTA measurement. They were significantly influenced by carbon content, start of melting for low carbon alloy and high carbon alloy were 1641 K and 1571 K respectively. Addition of Cr or V significantly lower the start of melting, especially for Cr added high carbon alloy. In case of Cr and V combined addition in solidification, there were two peaks suggesting two step solidification.