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41.检验钢中非金属夹杂物,为什么试样最好在淬火状况下制备?42.对变形后的钢材,检验非金属夹杂物时,为何取其纵断面?43.在光学金相显微镜下如何区别夹杂、污垢和凹坑?44.在光学金相显微镜下,怎样鉴别钢中非金属夹杂物的类型?其主要特征是什么?45.如何正确使用偏振光?46.如何区分Si-Mn弹簧钢中的石墨碳和抛光坑?47.弹簧经淬火后进行金相检验有何好处?48.磨削裂纹在金相上主要特征是什么?49.如何区分淬火时生成的先共析铁素体和白色马氏
41. Inspection of non-metallic inclusions in steel, why the sample is best prepared in the quenching condition? 42 deformed steel, testing of non-metallic inclusions, why take the longitudinal section? 43 optical microscopy How to distinguish between inclusions, dirt and pits? 44. How to identify the types of non-metallic inclusions in optical metallographic microscope? What are the main features? 45. How to correctly use polarized light? 46. How to distinguish Si-Mn What are the main characteristics of the grinding cracks in the metallographic? 49. How to distinguish between the first generation of eutectoid iron quenching Body and white Markov