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硬质合金中的常见相有α(WC)、β(W、C原子在粘结金属中的固溶体),γ(TiC-WC)、η_1(W_4CO_2C到W_3CO_3C成分不定的三元碳化物)和石墨。这些相受常用的碱性或酸性溶液浸蚀时,被腐蚀的程度差别很大,往往顾此失彼。如,γ相着色和晶界显露困难影响了α相和γ相的晶粒度测定:β相和η_1相易被深腐蚀呈黑色,不易与呈黑色的石墨和某些缺陷区分。因此,一般对不同类合金,甚至对不同的相(如η_1相)需采用不同的方法处理,并分步骤观测。为了解决上述问题,我们经多次试验,认为硬质合金试样经常规方法磨制。达到镜面光洁度后,用酒精或滤纸擦去油渍,按下述交流电电解腐蚀法腐蚀,
Common phases in cemented carbide are α (WC), β (solid solution of W and C atoms in the binder metal), γ (TiC-WC), η_1 (ternary carbide with W_4CO_2C to W_3CO_3C composition) . These commonly used alkaline or acidic solution erosion, the degree of corrosion is very different, often take the wrong side. For example, the γ-phase coloring and grain boundary revealing difficulties affect the α and γ phase grain size determination: β phase and η_1 phase is easily eroded black, not easy to distinguish with the black graphite and some defects. Therefore, generally different types of alloys, even for different phases (such as η_1 phase) need to use different methods to deal with, and step by step observation. In order to solve the above problems, we have tested many times, that carbide samples by conventional methods of grinding. After reaching the mirror finish, wipe off the grease with alcohol or filter paper, and then corrode by the following AC electrolytic etching method,