非块体材料金相教学探讨

Discussion of Metallographic Teaching of Non-bulk Materials

在金相教学过程中,金相试样的打磨和抛光是影响金相试样质量的两个重要环节。分析了传统块体材料和非块体材料显微组织结构的特点,指出了非块体材料显微组织结构容易受到磨抛损伤的原因。在此基础上,分析和总结了中国民航大学航空材料实验课程中,多孔材料及热喷涂涂层在金相制备过程中典型的“脱落型”假象、“碾压型”假象、“孔洞长大型”假象和“黏着型”假象4种异常金相出现的原因,并探讨了解决上述问题的方法。

In the process of metallographic teaching,grinding and polishing are two important processes that affect the quality of metallographic samples.The characteristics of microstructure of traditional bulk and non-bulk materials are analyzed in this paper,and the reason why the microstructure of non-bulk materials is easy to be damaged by grinding and polishing is pointed out.On this basis,the causes of four typical kinds of abnormal metallographic appearing in the experimental course of Aeronautical Materials in Civil Aviation University of China,such as“falling off type”,“rolling type”,“hole-growing type”and“adhering type”,were analyzed and summarized,and methods to solve the above-mentioned problems were discussed.