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151.什么是碳化物剥落?它与钢的疏松有何区别? 152.用退火状态金相法测定高速钢脱碳层的要领是什么? 153.高速工具钢在淬火加热过程中产生的脱碳其金相组织有何特征? 154.目前高速钢采用的晶粒度评定标准与一般8级晶粒度有何关系? 155.如何正确评定高速工具钢的淬火晶粒度? 156.W-Mo系高速钢淬火晶粒度有何特点? 157.淬火的高速钢制刀具是否应进行碳化物溶解程度的检查? 158.高速工具钢淬火过热的金相组织特征如何? 159.高速钢等温淬火的目的是什么?等温后得到什么组织? 160.为什么要检查高速工具钢的回火程度?回火程度如
151. What is carbide spalling? What is the difference between it and the loose steel? 152. Annealing Metallography method for determining the decalcification of high-speed steel What are the essentials? 153. High-speed tool steel in the quenching process decarburization of its gold What are the characteristics of phase organization? 154. At present the high-speed steel used in the grain size evaluation standards and the general grade 8 grain size has any relationship? 155. How to correctly assess the high-speed tool steel quenched grain size? 156. W-Mo Department of high speed What are the characteristics of steel quenching grain size? 157. High-speed quenching of the steel tool should check the degree of dissolution of carbide? 158. High-speed tool steel quenching overheating how the characteristics of the metallurgical? 159. High-speed steel isothermal quenching purpose What? What is the organization after isothermal? 160. Why check the tempering speed of high-speed tool steel? Tempering degree