Journal of Casting & Materials Engineering
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ISSN 2543-9901
Issue Date
2022
Volume
Vol. 6
Number
No. 3
Description
Journal Volume
Journal of Casting & Materials Engineering
Vol. 6 (2022)
Projects
Pages
Articles
The influence of cooling rate on the damping characteristics of the ZnAl4Cu1 alloy
(AGH University Press, 2022) Piwowarski, Grzegorz; Gracz, Beata
The paper presents the results of damping coefficient tests on the ZnAl4Cu1 alloy (ZL5). The damping coefficient has been calculated on the basis of specimen measurements obtained with the use of the signal echo method. The method consists in passing an ultrasonic wave through the tested material. The ultrasonic wave from a transmitting and receiving head passes through a specimen, bounces off its bottom surface and comes back to the measuring head in the form of a signal echo. The difference in the signal intensity between the first and the second echo in relation to the distance travelled by the ultrasound wave is avalue of the material's damping characteristics. The specimens were cast into three molds made of different materials, i.e. green sand, plaster and metal. The thermophysical properties of these materials are different, affecting the rate of heat absorption from the cast. Three series of specimens have been obtained which have different cooling rates. The specimens were then subjected to ultrasound and microscopic tests to assess the alloy structure. The internal alloy structure affects its damping properties to a great extent.
The effect of high silicon and molybdenum content on the mechanical properties and microstructure of gray cast iron
(AGH University Press, 2022) Dyrlaga, Łukasz; Kopyciński, Dariusz; Guzik, Edward; Soból, Grzegorz; Borak, Dariusz
This paper presents an overview of the current knowledge concerning SiMo ductile cast iron begins by describing the standard type of ductile cast iron before proceding to description of its microstructures. The paper then presents its chemical composition and the significant influence of individual elements on technological and mechanical properties. The research section focuses the influence of the addition of Si and Mo to the matrix of gray iron. After casting, stepped samples were carried out on the microstructure along with UTS tensile strength tests. The research presented in the article is a preliminary step towards the goal of obtaining a stable production process for silico-molybdenum cast iron.