Wongsangam, Jittraporn

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Preferred name
Wongsangam, Jittraporn
Alternative Name
Wongsa-Ngam, Jittraporn
Main Affiliation
Email
jittraporn.wo@kmitl.ac.th

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    Item type:Publication,
    The influence of HPT on microstructure and wear resistance of Al-7wt%Si-2wt%Fe Alloy
    (2021-01-01)
    Wongsa-Ngam, Jittraporn
    ;
    Xu, Jie
    ;
    Phongphisutthinan, Chakkrist
    ;
    Langdon, Terence G.
    An aluminum silicon-based alloy (Al-7wt%Si-2wt%Fe) was subjected to severe plastic deformation by the high-pressure torsion (HPT) method. This HPT processing was conducted at room temperature up to five revolutions under a pressure of 6.0 GPa and rotation speed of 1.0 rpm. Observations of microstructure evolution, especially intermetallic phases, was carried out by an optical microscope (OM) and a scanning electron microscope (SEM). It was found that the ironintermetallic particles decreased in size with numbers of turns. This is due to the large strain introduced during HPT processing which produced a degree of fragmentation of intermetallic phases which increased with the imposed strain. In addition, wear behaviors of the as-cast and samples deformed by HPT were also investigated using micro-tribometer UMT-2 (CETR Co., USA) following the ASTM G99-05 (2010) standard. The friction coefficient and wear volume loss were measured to evaluate the effect of imposed strain during HPT processing on wear resistance. It was found that the values of the average friction coefficient were slightly lower in deformed samples and the wear volume loss decreased with increasing numbers of turns.
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    Item type:Publication,
    Wear resistance of an ultrafine-grained Cu-Zr alloy processed by equal-channel angular pressing
    (2015-03-05)
    Li, Jianwei
    ;
    Wongsa-Ngam, Jittraporn
    ;
    Xu, Jie
    ;
    Shan, Debin
    ;
    Guo, Bin
    A Cu-0.1 wt.% Zr alloy was processed by equal-channel angular pressing (ECAP) through 8 passes at room temperature to produce an ultrafine grain size of ~350 nm with an average Vickers microindentation hardness (200 gf) of ~140. Ball-on-disc dry sliding tests were conducted on an annealed material and on the ECAP-processed alloy using applied normal loads from 1 to 15. N. The coefficient of friction (COF), surface topography and wear volume loss were examined to evaluate the micro-wear resistance. The results show that samples processed by ECAP have lower average values for the COF than the unprocessed alloy and there is also a decrease in the wear depth and wear volume loss with increasing numbers of ECAP passes. The ultrafine-grained alloy processed by ECAP has a higher wear resistance than the annealed and unprocessed material due to the significant grain refinement and improved mechanical properties.