Presented work discusses a complex process of inductive heating and quenching of carbon steel planetary shafts for diesel engine starters. Surface temperature measurements during the inductive heating process were realized in the industrial environment. The intensity and homogeneity of temperature fields on the surface of the planetary shafts were measured by thermographic camera. On the basis of developed mathematical model a computer program was developed, and used for analyses and induction hardening process optimization of planetary shaft.
F.10 Improvements to an existing technological process or technology
COBISS.SI-ID: 1041503In order to eliminate the separate solution soaking treatment used for Al-Cu extrudates, the influence of billet heat treatments before the extrusion process on a precipitation hardenable AlCu6PbBi alloy was studied. The investigations revealed that extrusion using the billet quenching process results in the formation of extrudates with similar mechanical properties, hardness and microstructures as those produced using conventional technology. BQ is an efficient and reliable substitute for the conventional extrusion process.
F.10 Improvements to an existing technological process or technology
COBISS.SI-ID: 1004383The reduction of area in the through thickness direction is an essential mechanical property of thick steel heavy plates. By a routine control, a very small through thickness reduction of area was found for tensile specimen of a 90 mm plate. Careful investigations of the fracture and section of specimens cut from the as solidified continuously cast 250 mm thick slab showed that the cause was the presence of coarse particles of niobium carbonitride as constituent of the quasi eutectic Fe-Nb(C, N) that form because of the centerline segregation of Nb.
F.07 Improvements to an existing product
An examination of the process of selective oxidation for molten pig iron indicates the possibility of lowering the content of unwanted or harmful elements. This process makes it possible to achieve the optimum Mn content in pig iron (hot metal) without any oxidation of the other elements present, such as carbon, etc. The lowering of the Mn content in the hot metal to the limit solves the problems of converter processing, lowers the slag quantity, increases the yield of steel by more 4 % and improves the steel-making process.
F.13 Development of new production methods and tools or processes
COBISS.SI-ID: 828586The microstructures of the base materials (EN 10216-1 and EN 10083-3) and three consumables (EVB 50, EVB CrMo and INOX R 29/9) were investigated in the as-welded and heat-treated states. The microstructure of the base material EN 10216-1 consisted mainly of ferrite. The weld with EVB 50 showed a ferritic and bainitic microstructure. The weld with the consumable EVB CrMo showed a microstructure that consisted of ferrite and some bainite. The microstructure of the weld with the consumable INOX R 29/9 showed an austenic and ferritic microstructure.
F.14 Improvements to existing production methods and tools or processes
COBISS.SI-ID: 1097311