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원심주조방법으로 제조된 고속도강 압연롤의 미세조직과 파괴특성
이성학,이희춘,황근철 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.12
A study was made of the effects of alloying elements on microstructural factors of nine high speed steel (HSS) rolls manufactured by centrifugal casting method. Particular emphasis was placed on the role of hard carbides located along solidification cell boundary and the type of the martensite matrix. Microstructural observation, X-ray diffraction analysis, and hardness measurement were conducted on the rolls to identify carbides. Various types of carbides mostly segregated in the intercellular regions were dependent upon alloying elements and their amount, and played an important role in overall roll hardness. The effects of alloying elements were analyzed on the basis of the liquidus surface diagram, suggesting that the proper contents of carbon, tungsten, molybdenum, chromium, and vanadium were 1.9-2.0%, 3-4%, 3-4%, 5-7%, and 5-6%, respectively.