Przeglądaj wg Autor "Rapiejko, Cezary"
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Pozycja Analysis of AM60 and AZ91 alloy crystallisation in ceramic moulds by Thermal Derivative Analysis (TDA).(2014) Rapiejko, Cezary; Pisarek, Bogusław; Czekaj, E.; Pacyniak, TadeuszThe work presents the test results of the crystallisation and cooling of magnesium alloys: AM60 and AZ91, with the use of the TDA method. The tested alloys were cast into ceramic shells heated up to 180 C, produced according to the technology of the shell production in the investment casting method. The TDA method was applied to record and characterize the thermal effect resulting from the phase transformations occurring during the crystallisation of magnesium alloys. The kinetics and dynamics of the thermal processes of the crystallisation of AM60 and AZ91 in the ceramic shells were determined. Metallographic tests were performed with the use of an optical microscope as well as scanning microscopy, together with the EDS chemical analysis of the phases present in the tested casts. A comparison of these test results with the thermal effect recorded by way of the TDA method was made.Pozycja Analysis of the crystallization of AZ91 alloy by thermal and derivative analysis method intensively cooled in ceramic shell.(2014) Rapiejko, Cezary; Pisarek, Bogusław; Czekaj, E.; Pacyniak, TadeuszThe work presents the test result of the influence of cooling rate on the microstructure of AZ91 alloy, Vickers micro-hardness and Brinell hardness. Studies cooling and crystallization of AZ91 alloy was cast into the ceramic shells pre-heated to 180 ° C and then air-cooled at ambient temperature or intensively super cooled in the liquid coolant. The TDA method was applied to record and characterize the thermal effect resulting from the phase transformations occurring during the crystallization of AZ91 alloy. The kinetics and dynamics of the thermal processes of crystallization of AZ91 alloy in the ceramic shells were determined. Metallographic tests were performed with the use of an optical microscope. A comparison of these test results with the thermal effect recorded by way of the TDA method was made. Influence of cooling rate of AZ91 on HV0, 01 micro-hardness and Brinell hardness alloy was examined.Pozycja Effect of Cr and V alloy additions on the microstructure and mechanical properties of AM60 magnesium alloy(2014) Rapiejko, Cezary; Pisarek, Bogusław; Pacyniak, TadeuszThe paper presents the results of the investigation of the effect of Cr and/or V alloy additions on the microstructure and mechanical properties of the magnesium AM60 alloy. The examinations are performed within the frames of a project aiming at the elaboration of an experimental and industrial technology of producing constructively complex elements of machines and devices made of magnesium alloys with the method of investment casting. It has been proven that small numbers of Cr and V alloy additions improve the strength properties: Rm, A%, and the hardness HB of the obtained casts. The experimental casts were made in ceramic molds.Pozycja Odlewanie precyzyjne stopów magnezu o podwyższonych właściwościach(Wydawnictwo Politechnika Łódzka, 2018) Rapiejko, Cezary; Red. nauk. Wydziału Mechanicznego: Kapitaniak, Tomasz; Konopka, Zbigniew; Władysiak, RyszardW pracy przedstawiono wybrane aspekty technologii precyzyjnego odlewania stopów magnezu o podwyższonych właściwościach w formach ceramicznych. Przedstawione wyniki badań dotyczą możliwości otrzymywania odlewów ze stopów magnezu o podwyższonych właściwościach mechanicznych i tribologicznych w technologii wytapianych modeli. Poprawę właściwości stopów magnezu uzyskano w wyniku opracowania składu chemicznego nowych stopów magnezu w oparciu o znormalizowane stopy AM60 i AZ91 oraz parametrów ich krystalizacji stosując intensywne studzenie form ceramicznych. W pracy przedstawiono wpływ dodatków chromu lub/i wanadu na mikrostrukturę, charakterystyczne krzywe ATD oraz właściwości mechaniczne oraz tribologiczne badanych stopów. Dodatkowo przedstawiono wyniki badań dotyczące opracowania innowacyjnej technologii nanoszenia inhibitorów na wewnętrzne ściany formy ceramicznej, których zastosowanie pozwoliło na wykonanie odlewów pozbawionych wad powierzchniowych (...).