Filtreler
Effect of SiC particle size on corrosion behavior of pressure infiltrated Al matrix composites in a NaCl solution

Candan S.

Article | 2004 | Materials Letters58 ( 27-28 ) , pp.3601 - 3605

In this study, the effect of SiC particle size on corrosion behavior of Al-60 vol.% SiC particle composites has been investigated. Three different SiC particle composites, having mean diameters of 13, 23 and 37 µm, were produced by a pressure infiltration technique at 750°C. The corrosion tests were carried out in 3.5 wt.% NaCl environment up to 28 days. Experimental results showed that the weight loss of the 1composites increased with increasing particle size and exposure time. However, weight loss of the composites having 13- and 23-µm particle sizes remained almost constant after 3-5 days of exposure time. Scanning electron micro . . .scopic (SEM) analysis and potentiodynamic polarization measurements revealed that composite having 13-µm SiC particles exhibited higher corrosion resistance than that of the composites having 23-and 37-nm SiC particles. Experimental results showed that intermetallics as a result of reaction between Al and SiC particle has a beneficial effect on corrosion resistance of the composites due to interruption of the continuity of the matrix channels within the pressure infiltrated composites. © 2004 Elsevier B.V. All rights reserved Daha fazlası Daha az

Corrosion behavior of Al-60 vol.% SiCp composites in NaCl solution

Candan S. | Bilgic E.

Article | 2004 | Materials Letters58 ( 22-23 ) , pp.2787 - 2790

In this study, corrosion behavior of pure Al and Al-4 wt.% Mg alloy matrix composites, comprising 60 vol.% SiC particles, has been investigated. Composites were produced by pressure infiltration technique at 750 °C. The corrosion tests were carried out in 3.5 wt.% NaCl environment up to 28 days. The weight loss of the composites increased with increasing duration time up to 3-5 days then remained constant. Scanning electron microscopy (SEM) analysis showed that Al-4 wt.% Mg alloyed matrix composite exhibited higher corrosion resistance than pure Al matrix composite although potentiodynamic polarisation measurements showed higher ico . . .rr values of Al-4 wt.% Mg alloyed matrix composites than pure Al matrix composites. Experimental results revealed that precipitation of Mg2Si as a result of reaction between Al-Mg alloy and SiC particle has a beneficial effect on corrosion resistance of Al-4Mg alloy matrix composites due to interruption of the continuity of the matrix channels within the pressure infiltrated composites. © 2004 Elsevier B.V. All rights reserved Daha fazlası Daha az

Effect of microstructure on corrosion behavior of dual-phase steels

Salamci E. | Candan S. | Kabakci F.

Article | 2017 | Kovove Materialy55 ( 2 ) , pp.133 - 139

Dual phase (DP) steels with different volume fractions of martensite and epitaxial ferrite were produced in different intercritical annealing temperatures and cooling rates. Corrosion behaviors of four different DP steels were investigated in 3.5 % NaCl solution by using potentiodynamic polarization and immersion tests. The results showed that both amounts of martensite and epitaxial ferrite have an influence on the corrosion behavior of DP steels. It was observed that corrosion resistance increased considerably with the presence of epitaxial ferrite as compared to dual phase steel containing non-epitaxial ferrite. On the other hand . . ., the corrosion resistance of DP steels decreased with an increase in the martensite volume fraction (MVF) Daha fazlası Daha az

Earthquake behavior of reinforced concrete frames subjected to rebar corrosion

Yüksel İ. | Coşkan S.

Conference Object | 2013 | Sustainable Construction Materials and Technologies2013-August , pp.133 - 139

The aim of this paper is to investigate the earthquake behaviour of reinforced concrete frames subjected to rebar corrosion. A typical two-bay, four-story reinforced concrete (RC) frame is designed. Two different rebar corrosion scenarios and a design spectrum are selected. The deteriorated condition in these scenarios are included which are loss in diameter of rebar, changes of mechanical properties of reinforcement steel bars, bond strength and changes in damage limits of concrete sections. The RC frame is evaluated using a nonlinear static analysis method in sound condition as well as deteriorated conditions. The rebar corrosion . . .effect on the global level is investigated by comparing the responses of each scenario with respect to the response of sound condition of the frame. The result shows that the progressive deterioration of frames over time can cause serious reductions on the load-bearing capacity. Hence the overall seismic behaviour of the frame is adversely affected. © 2013 Sustainable Construction Materials and Technologies. All rights reserved Daha fazlası Daha az

Joining of titanium/stainless steel by explosive welding and effect on interface

Kahraman N. | Gülenç B. | Findik F.

Article | 2005 | Journal of Materials Processing Technology169 ( 2 ) , pp.127 - 133

The purpose of this study is to produce composite plates through explosive welding process widely used in developed countries and is of great importance to produce such plates and unfortunately currently its use in our country is not common. In this study, stainless steel-titanium plates were joined explosively employing oblique geometry route at different explosive ratios. The bonding was investigated using optical and scanning electron microscopy and tensile-shearing, bending, hardness and corrosion tests were carried out. Optical and scanning electron microscopy examinations showed that a transition was observed from smooth bondi . . .ng interface to a wavy one with increasing explosive ratio. It was also observed that grains near the interface were elongated parallel to the explosion direction. No shearing within the interface was seen from the tensile-shear tests and fracture took place within the low strength material. The bended specimens showed that defects such as separation and tearing were not observed. Hardness was increased with increasing explosive ratio and the highest hardness values were obtained near the bonding interface. Weight increase due to formation of a stable oxide layer on the welded stainless steel-titanium plates was seen from corrosion tests while weight loss was seen from the other specimens and this loss was increased with increasing explosive ratio. © 2005 Elsevier B.V. All rights reserved Daha fazlası Daha az

Corrosion and mechanical-microstructural aspects of dissimilar joints of Ti-6Al-4V and Al plates

Kahraman N. | Gulenc B. | Findik F.

Article | 2007 | International Journal of Impact Engineering34 ( 8 ) , pp.1423 - 1432

In this study, Ti-6Al-4V and Al plates were joined by explosive welding at various explosive loads. Tensile-shear, bending, hardness, microstructure and corrosion behaviours of the explosively joined samples were investigated. At the end of the tensile-shear tests carried out according to ASTM D 3165-95 standard, no seperation was observed in the interfaces of the joined samples. The results of the bending tests also showed no sign of any distinctive seperation, crack and tear in the interfaces. The highest hardness values were measured in regions next to interfaces. The optical microscope and SEM examinations revealed that an incre . . .ment in wavelength and amplitude was observed with increasing explosive load. It is seen from the corrosion test results that materials loss was high at the beginning of the corossion tests but the rate of material loss decreased later on. Furthermore, increasing deformation with increasing explosive load increased the materials loss in corrosion tests. © 2006 Elsevier Ltd. All rights reserved Daha fazlası Daha az

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