S. Suriansyah, Pratikto, Agus Suprapto, Yudi Surya Irawan
The purpose of this study was to test the Cryogenic Cooling Effect Mar temper and Temper of the hardness and microstructure of Ductile Cast Iron (FCD-45). Heat treatment process the test material with the heating process starts from 0°C to 600°C. Heating interval is done so that the specimen does not have cracks, holding for 45 minutes. Furthermore, heated again to 900oC (temperature austenite), and hold 60 minutes. Then the process is continued, the specimen was cooled to put another Furnace heating at a temperature of 200°C for 10 minutes. Subsequently the specimens removed from the Furnace in a state of 450°c temperature and put in the water until it reaches room temperature. Specimens reprocessed by entering into liquid nitrogen with -193°C temperature for 120 minutes. Test objects are removed from the liquid nitrogen, heated in an open space until it reaches room temperature, 30°-35°C. Final heat treatment process of the test object is, put in the Furnace heating (tempering process) at a temperature of 200°C for 60 minutes. FCD-45 (As-Cast) after being subjected to mar tempering, and tempering of ductile iron (Matdi), the hardness increased from 86 to 90 HRB. But if FCD-45 (As-Cast) subjected mar temper, cryogenic, and temper of ductile iron (Mactdi) process will result in increased hardness of 86 to 94 HRB. FCD-45 (As-Cast) having microstructures of perlite, ferrite and graphite nodules. Matdi process produces microstructures of perlite, ferrite, graphite nodules, residual austenite and martensite tempered. As for the process Mactdi produce microstructures perlite, ferrite, graphite nodules and martensite. The amount of martensite generated in the process Mactdi more when compared with the amount of martensite produced in Matdi process. © Research India Publications.
Brawijaya University, Mechanical Engineering Departement, 65145, East Java, Indonesia; Mechanical Engineering Departement, Merdeka University, East Java, Indonesia; Universitas Widyagama, Mechanical Engineering Department, Malang, East Java, Indonesia
