Uticaj otapajućeg žarenja na svojstva čelika Nitronic 60a

Nitronic 60 (UNS S21800) is a highly alloyed austenitic stainless steel. This steel provides exceptional wear and galling resistance as well as a high temperature corrosion resistance. Increasing strength of Nitronic 60 is obtained by cold deformation. A solution annealing is necessary to achieve a complete austenitic microstructure without the presence of precipitates in the matrix. This paper describes determination of the appropriate heat treatment to obtain austenitic microstructure with a minimum consumption of time and energy.Nitronic 60 (UNS S21800) je visoko legirani austenitni nehrđajući čelik. Izraženo svojstvo ovog materijala je otpornost na habanje i trganje površine kao i otpornost prema visokotemperaturnoj koroziji. Najčešći postupak očvršćavanja čelika je deformacijsko, postupkom hladne deformacije. Da bi se postigla potpuna austenitna mikrostruktura bez prisustva precipitata u matriksu potrebno je izvršiti tzv. otapajuće žarenje. U ovom radu je opisan postupak određivanja odgovarajućeg toplinskog tretmana da bi se dobila odgovarajuća mikrostruktura uz minimalan utrošak vremena i energije

Analiza i ispitivanje nemetalnih uključaka za čelik 100Cr6

Steel 100Cr6 belongs to a group of hardened steels, which are applicable for production of rolling element parts. Because of specific working conditions, a proper chemical composition is required with a minimum content of nonmetallic inclusion. In this paper, the research results of presence the nonmetallic inclusions and their chemical composition are presented for the steel produced in vacuum and open induction electric furnace and their influence on the prescribed properties for this steel. The optical and scanning electronic microscope are used to identify presence and the chemical compositions of nonmetallic inclusions.Čelik 100Cr6 pripada grupi prokaljivih čelika koji su prvenstveno našli primjenu u proizvodnji dijelova kotrljajućih ležajeva. Glede posebnih uvjeta rada za ovu vrstu čelika se zahtijeva propisani kemijski sastav sa minimalnim prisustvom nemetalnih uključaka. U ovom radu su predstavljeni rezultati ispitivanja prisustva nemetalnih uključaka i njihov kemijski sastav za čelik 100Cr6 proizveden u vakuumskoj i otvorenoj indukcionoj elektro peći te njihov uticaj na svojstva propisane normom za ovu vrstu čelika. Ispitivanje prisustva nemetalnih uključaka kao i analiza kemijskog sastava urađena je primjenom optičkog i skening elektronskog mikroskopa

Influece of the austempering temperature on the tensile strength of the austempered ductile iron (ADI) samples

Austempered Ductile Iron (ADI) is a class of ductile iron subjected to a two-step heat treatment process – austenitization and austempering. The heat treatment gives to ADI a high value of tensile strength and an especially good strength-to-weight ratio. However, designers in most cases are unfamiliar with this material that can compete favorably with steel and aluminum castings, weldments and forgings. The high tensile strength of ADI is the result of its unique ausferrite microstructure. In this paper, an investigation of the influence of the austempering temperature on the tensile strength of the ADI samples is presented

Analyse and research of nonmetallic inclusions for steel 100Cr6

Steel 100Cr6 belongs to a group of hardened steels, which are applicable for production of rolling element parts. Because of specific working conditions, a proper chemical composition is required with a minimum content of nonmetallic inclusion. In this paper, the research results of presence the nonmetallic inclusions and their chemical composition are presented for the steel produced in vacuum and open induction electric furnace and their influence on the prescribed properties for this steel. The optical and scanning electronic microscope are used to identify presence and the chemical compositions of nonmetallic inclusions

Analysis of the influence of chemical composition and temperature on mechanical properties of superalloys NIMONIC 80A

Superalloys Nimonic 80A is a wrought nickel base alloy (min. 65 % Ni) and chromium (20 %), with minor additions of carbon, cobalt and iron, as well as major alloying elements of aluminum (1 to 1,8 %) and titanium (1,8 to 2,7 %). Chemical composition of the alloy Nimonic 80A has a dominant influence on its mechanical and technological properties. Increasing of the temperature also has a large influence on the mechanical properties of superalloy Nimonic 80A Investigations which were carried out have included chemical testing and testing of mechanical properties of superalloy Nimonic 80A at room and higher temperatures. Regression analysis was done on the base of chemical analyses and results of mechanical properties. The results of regression analysis are equations by which on the basis of known chemical composition, ie content of main alloying elements Al, Ti and Co, the mechanical properties of materials at room and higher temperatures can be predicted

Analysis of the influence of chemical composition and temperature on mechanical properties of superalloys NIMONIC 80A

Superalloys Nimonic 80A is a wrought nickel base alloy (min. 65 % Ni) and chromium (20 %), with minor additions of carbon, cobalt and iron, as well as major alloying elements of aluminum (1 to 1,8 %) and titanium (1,8 to 2,7 %). Chemical composition of the alloy Nimonic 80A has a dominant influence on its mechanical and technological properties. Increasing of the temperature also has a large influence on the mechanical properties of superalloy Nimonic 80A Investigations which were carried out have included chemical testing and testing of mechanical properties of superalloy Nimonic 80A at room and higher temperatures. Regression analysis was done on the base of chemical analyses and results of mechanical properties. The results of regression analysis are equations by which on the basis of known chemical composition, ie content of main alloying elements Al, Ti and Co, the mechanical properties of materials at room and higher temperatures can be predicted