Comparisons of different methods used for improving life of hot forging dies

ABSTRACTMSc THESISCOMPARISONS OF DIFFERENT METHODS USED FOR IMPROVINGLIFE OF HOT FORGING DIESHaydar POLATDEPARTMENT of MECHANICHAL ENGINEERINGINSTITUTE of NATURAL and APPLIED SCIENCESUNIVERSITY of ÇUKUROVASupervisor : Prof. Dr. Melih BAYRAMOĞLUYear : 2006, Page: 104Jury : Prof. Dr. Melih BAYRAMOĞLUProf. Dr. Necdet GERENAssist.Prof. Dr. Ali KOKANGÜLIn this work, many of the methods used for improving life of hot forging dieswere investigated in the forging department ÇIMSATAŞ. For this aim, the surfacetreatments such as one layer surface coating AlTiN, a special multilayer coatingcalled TOKTEK (two layer coating), nitriding, and the weld overlay coating of thecontact surface of the hot forging dies were studied with same hot forging dies undersame conditions and the results were compared with the as received die material. Theas received material was hardened and tempered DIN 1.2344 (ORVAR 2M) steelwith the final hardness of 44-46 HRC.After the experiments, it was found out that all of these methods improve lifeof hot forging dies in various amounts and the best result was obtained by weldoverlay of the contact surface of the dies with CASTOLIN N9080.Key Words: hot forging, die life, nitriding, weld overlay coating