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有些高速鋼在热处理后硬度很正常,但晶粒粗大,断口发亮,似魚鱗狀。这种缺陷叫做萘断口,使韌性、强度显著降低,寿命大大縮短。高速鋼在重行淬火时沒有经过退火。或者退火不完全就会出現萘断口;所以在重行淬火前应該进行良好的退火,以改进材料的內部組織。已經出现了的萘断口用正常的退火法是不能消除的。經驗証明:毛坯直徑小于10～15公厘,在三次淬火后不会得到萘断口。 現在向大家介紹一种消除高速鋼萘断口的方法。这种方法的整个操作过
Some high-speed steel in the heat treatment after the hardness is normal, but coarse grains, bright broken mouth, like fish scales. This defect is called naphthalene fracture, the toughness, strength significantly reduced life expectancy greatly reduced. High-speed steel in the re-quenching without annealing. Or incomplete annealing will occur naphthalene fracture; so before the re-quenching should be a good anneal to improve the material’s internal organization. The naphthalene fracture that has appeared can not be eliminated by the normal annealing method. Experience has shown that: rough diameter of less than 10 to 15 mm, after three quenches will not be naphthalene fracture. Now to introduce a method to eliminate high-speed steel naphthalene fracture. The whole operation of this method