MECHANICAL AND METALLOGRAPHIC TESTINGS OF CEMENTED LAYERS

Tema ovoga završnog rada su mehanička i metalografska ispitivanja cementiranih slojeva. Rad se sastoji od teorijskog i eksperimentalnog dijela. U teorijskom dijelu rada, prema nastanku površinskog sloja sistematizirani su postupci površinske toplinske obrade, te su ukratko opisani osnovni postupci prevlačenja i modificiranja površine. U nastavku rada ukratko su opisani najčešći postupci termokemijske obrade. Budući da je tema rada cementiranje, ovaj postupak je opisan detaljnije. U eksperimentalnom dijelu rada proveden je postupak cementiranja na ispitnom uzorku izrađenom od čelika C15. Prije i nakon cementiranja provedena je metalografska analiza, te je ispitana tvrdoća površinskog sloja i određena efektivna debljina cementiranog sloja.The topic of this final paper is mechanical and metallographic testing of cemented layers. It consists of a theoretical and experimental part. In the theoretical part of the paper, by the surface layer formation, the surface heat treatment processes are systematized and the basic methods of coating and surface modification are briefly described. In the following, the paper elaborates on the most common procedures of thermochemical processing. Since the theme of this final paper is cementing, this procedure is described more precisely. Experimental part consists of cementing the test sample made of steel C15. The sample was metallographically analysed and its surface layer hardness was tested before and after the cementation process in order to determine the effective thickness of cemented layer