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212.金相组织与切削加工性能之间有何关系?常用钢退火、正火后的组织应控制在什么范围? 213.淬火马氏体为什么会有色彩上的差异?马氏体的这种“黑白差”有几种形式?在金相检验上有何应
212. What is the relationship between metallographic structure and cutting performance? Common steel annealing, normalizing the organization should be controlled in what extent? 213. What is the difference between quenched martensite color? Martensitic this “Black and white difference ” in several forms? What should be the metallographic examination