Statistical optimization of stress relieving parameters on closed cell aluminium foam using central composite design
Journal Title: Archives of Materials Science and Engineering - Year 2018, Vol 2, Issue 89
Abstract
Purpose: This study concerns about the influence of stress relieving parameters on the hardness of closed cell aluminium foam using central composite design. Design/methodology/approach: The responses of three stress relieving parameters: heating temperature, holding time and stabilization temperature are studied and analysed through 20 experimental runs designed according to central composite design. The results of microhardness test corresponded to the microstructural evaluation of closed-cell aluminium foam using optical microscope. Analysis of Variance (ANOVA) technique is employed to study the significance of each parameter on the microhardness property. In this process the design has five levels for each parameter. The stress relieving process of the samples were performed using a vacuum furnace. The hardness test was conducted using a micro hardness tester LM247AT and the microstructure of the samples were obtained using optical microscopy technique. Findings: It was found that the highest value of hardness of 192.78 HV was obtained when the stress relieving process is set with the following parameters: heating (500°C); holding time (120 min) and stabilization temperature (450°C). Since higher heating temperature and longer holding time produce sample with larger grain size and has an adverse effect on the hardness value. Research limitations/implications: Liquid metal and powder metallurgical processing still produces a non-uniform and poorly reproducible cellular structure. This cellular structure demonstrates poor quality difference on decomposition and melting temperature, called anisotropic early expansion. Originality/value: To improve the poor cellular structure quality, stress relieving method is proposed in this study. Stress relieving method can improve the microstructure of the material.<br/><br/>
Authors and Affiliations
D. Puspitasari, T. L. Ginta, M. Mustapha, N. Sallih, P. Puspitasari
Keywords
Related Articles
- EP ID EP274642
- DOI 10.5604/01.3001.0011.7172
- Views 58
- Downloads 0
Effect of plastic deformation rate at room temperature on structure and mechanical properties of high-Mn austenitic Mn-Al-Si 25-3-3 type steel
Purpose: The aim of the paper is to determine influence of plastic deformation rate at room temperature on structure and mechanical properties of high-Mn austenitic Mn-Al-Si 25-3-3 type steel tested at room temperature....
PVD surface treatment of heat-treated cast aluminium alloys
Purpose: Main purpose of the paper is results share of AlSi9Cu and AlSi9Cu4 castaluminium alloys treatment investigation. Processing was performed using CAE-PVDmethod in order to obtain gradient coatings.Design/methodolo...
Functionalization of technical textile tapes
Purpose: The aim of the study was to deposit a hydrophobic barrier coating on technical tapes in order to protect them from water and to test and assess the obtained products. Design/methodology/approach: The coatings we...
Influence of 65G steel microstructure on crack faces friction factor under mode II fatigue fracture
Purpose: The aim of the paper is to evaluate the dependence of microstructure parameters,strength and plasticity of steel on crack faces friction factor.Design/methodology/approach: The specimens for the investigation we...
Model carbonitride precipitation kinetics in Ti-microalloyed HSLA-type steel
Purpose: The work presents the model of precipitation kinetics of M(C,N) carbonitride in micro-alloyed steel, containing microaddition of Ti, under conditions of isothermal holding in austenite. The model has been based...