Wyniki wyszukiwania - BazTech

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Analiza wtrąceń niemetalicznych w odlewach ze stopu AZ91 wykonanych z udziałem złomu obiegowego w procesie wysokociśnieniowego odlewania

Konopka Z., Chojnacki A.

Prace Instytutu Odlewnictwa

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2016

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Vol. 56, no. 4

321--328

PL

W artykule przedstawiono wyniki badań wpływu udziału złomu obiegowego we wsadzie stopu AZ91 na zmianę struktury odlewów wykonanych metodą wysokociśnieniowego odlewania, ze szczególnym uwzględnieniem tworzenia się wtrąceń niemetalicznych. Na podstawie obserwacji wtrąceń metodą mikroskopii skaningowej określono skład chemiczny tych wtrąceń w wytopach z różnym udziałem złomu obiegowego we wsadzie.

EN

The article presents research results of the process foundry return influence in the AZ91 alloy charge on the change in the structure of castings made by the high-pressure casting method, with special consideration of the formation of non-metallic inclusions. Based on the observations of inclusions by the scanning microscopy method, the chemical composition of the inclusions in melts with different process scrap contents in the charge was determined.

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Analysis of the Crystallization of AZ91 Alloy by Thermal and Derivative Analysis Method Intensively Cooled in Ceramic Shell

Rapiejko C., Pisarek B., Czekaj E., Pacyniak T.

Archives of Foundry Engineering

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2014

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Vol. 14, iss. 1

97--102

EN

The 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.

3

echanical properties of high-pressure die-casting AZ91 magnesium alloy

Braszczyńska-Malik K. N., Zawadzki I., Walczak W., Braszczyński J.

Archives of Foundry Engineering

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2008

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Vol. 8, iss. 4

15-18

EN

Results of mechanical properties of high-pressure die-casting AZ91 magnesium alloy are presented. Performed examinations allowed to determine influence of plunger velocity in the first and second stage and intensification pressure on the ultimate tensile strength (UTS), yield strength (YS), elongation (A5 and Agt), Brinell hardness (HB) and impact strength (IS) of samples cast on 320 tone cold chamber machine. Obtained results revealed the highest properties at median used parameters and also the most powerful effect of plunger velocity in the first stage. The maximum values of mechanical properties obtained from the performed experiments were: UTS 250 MPa, YS 160 MPa, A5 7%, 70 HB, IS 7 J.