Heat treating process of workpiece FZ.19-PT.67

Toplinska obrada obuhvaća čitav niz procesa pri kojima se temperaturni djeluje na materijal s ciljem promjene njegove mikrostrukture pa tako i svojstava. U prvom, teorijskom dijelu rada, opisane su karakteristike različitih mikrostruktura čelika kao i neki od postupaka toplinske obrade te načini ispitivanja tvrdoće materijala. Naglasak je stavljen na proces cementiranja koji se provodio i praktično pa je tako u drugom, praktičnom dijelu rada, opisan postupak cementiranja na 910°C te kasnije ispitivanje tvrdoće prije i nakon toplinske obrade kako bi se mogli donijeti smisleni zaključci te uvidjeti smisao samog postupka cementiranja koje obuhvaća pougljičavanje, kaljenje, gašenje i niskotemperaturno popuštanje.Heat treatment involves a whole range of processes in which the temperature acts on a material with the aim of changing its microstructure and thus its properties. The first, theoretical part of the paper describes the characteristics of different microstructures of steel as well as some of the heat treatment processes and methods of testing the hardness of materials. Emphasis was placed on the cementing process that was carried out and practically, so the second, practical part of the paper describes the cementing process at 910 ° C and the subsequent hardness testing before and after heat treatment, so that meaningful conclusions can be made and see the meaning of the cementing process itself which includes carbonation, tempering, quenching and low temperature tempering