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81.GCr15钢的淬火加热温度过高或过低,对其淬火组织和性能有何影响?82.什么叫黑脆断口?哪些钢类易出现黑脆断口?影响黑脆断口的因素有哪些?83.淬火裂纹与钢中的碳含量有何关系?84.高速钢产生萘状断口的条件是什么?萘状断口的宏观特征和显微组织特征如何?85.为什么在轴承钢中容易获得隐针马氏体?86.为什么60Si2Mn 钢中碳化物不易球化?预淬为什么能加速碳化物的球化?87.用何侵蚀剂可显示60Si2Mn 钢的球化组织?如何才能使球化组织清晰?88.60Si2Mn 钢中淬、回火组织中为什么会出现游离铁素体?如何才能消除?(指正常淬、回火工艺)89.什么是固溶体的脱溶?用什么方法可研究固溶体的
81.GCr15 steel quenching heating temperature is too high or too low, the quenching organization and performance of what effect? 82. What is the black brittle fracture? What kind of steel prone to brittle fracture? Affect the black brittle fracture What are the factors? 83. What is the relationship between quenched cracks and the carbon content in the steel? 84. What are the conditions for producing naphthalene fractures in high-speed steel? What are the macroscopic and microscopic characteristics of naphthalene fractures? 85. Why is it easy to get hidden in bearing steel? Needle martensite? 86 Why 60Si2Mn carbide in steel is not easy to ball? Pre-quenching can accelerate the ball of carbide? 87. What etchants can be used to show 60Si2Mn steel ball organization? How to make the ball organization clear 88.60Si2Mn steel quenching, tempering the organization why the emergence of free ferrite? How to eliminate? (Refers to the normal quenching and tempering process) 89. What is the dissolution of solid solution? What method can be used to study the solid solution