PENGARUH HEAT TREATMENT TERHADAP STRUKTUR MIKRO DAN KEKERASAN BAJA CrMoV DENGAN MEDIA QUENCH YANG BERBEDA

Abstract

Heat treatments had been tested to enhance the hardness of CrMoV alloy steel. Heat treatments designed was heating at 1000ºC, holding time 1 hour then quenched at water, oil and air respectively. From any cooling media used, water cooling media (rapid cooling) to produce highest hardness number ~ 909 HV. It was seen from microstructure test, the effect of solute atom carbon in ferro atom in martensite structure as a result of rapid cooling while in an initial specimen which was not yet hardened, the hardness number ~ 278 HV. So, it resulted almost 2,3 times the initial
hardness number. In this paper the hardening mechanism for alloy steel is discussed.