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Investigation of nickel aluminium bronze castings properties by degassing agent technique

Kavinjr, . and Rashidi, M. M. and Asnul Hadi, Ahmad (2019) Investigation of nickel aluminium bronze castings properties by degassing agent technique. In: 1st International Postgraduate Conferenceon Mechanical Engineering 2018, 31 Oktober 2018 , Universiti Malaysia Pahang, Pekan. pp. 1-11., 469 (1). ISSN 1757-8981 (Print); 1757-899X (Online) (In Press)

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Abstract

Nickel Aluminium Bronze (NAB) is an excellent engineering material for maritime application due to its selective mechanical properties and relatively excellent corrosion resistant. However, NAB is susceptible to porosities due to dissolved gasses absorbed during its casting processes and adversely affects the mechanical properties. So, a degassing agent is added to the melt of NAB before the pouring process to reduce the dissolved gasses. A few parameters were initiated to investigate the effect of the degassing agent. Firstly, the effect of the degassing agent on the solidification behavior of the NAB alloy is studied using thermal analysis. Cooling curves can provide information on liquidus, eutectic, undercooling, recalescence and solidus temperature of the NAB alloy. Secondly, Differential thermal analysis (DTA) technique is employed to determine this thermal arrest temperature of NAB alloy from the cooling curves. The increasing in degassing agent addition will increase the average cooling rate of the NAB during solidification process but also slightly increasing the recalescence effect at the same time. It is discovered the higher cooling rate will reduce the dendritic growth and lead to better mechanical properties. Higher degassing addition also produced a smaller dendritic structure which promotes the higher mechanical strength. It has been proven through the tensile test, hardness test and microstructure analysis using FESEM. The relationship between, DAS average length, SDAS average length, tensile stress and hardness have been studied.

Item Type: Conference or Workshop Item (Lecture)
Additional Information: Indexed by SCOPUS
Uncontrolled Keywords: Mechanical properties; Aluminum corrosion; Degassing; Solidification process
Subjects: T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Faculty of Mechanical Engineering
Depositing User: Pn. Hazlinda Abd Rahman
Date Deposited: 27 May 2019 06:15
Last Modified: 28 Nov 2019 06:37
URI: http://umpir.ump.edu.my/id/eprint/24385
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