STP1532

    Effect of Gas Pressure on Active Screen Plasma Nitriding Response

    Published: Apr 2012


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    Abstract

    An austenitic stainless steel AISI 304 was active screen plasma nitrided using a 304 steel screen to investigate the effect of the gas pressure on the nitriding response. The sample was treated for 18 ks at 723 K in 25 % N2 + 75 % H2. The gas pressure was changed to 100, 600, and 1200 Pa. The distance between the screen and the sample was also changed to 10, 30, and 50 mm. The nitrided samples were characterized by observing their appearance and surface roughness by optical microscopy, X-ray diffraction, and microhardness testing. After nitriding, polygonal particles with a normal distribution were observed at the center and edges of all the nitrided sample surfaces. The particles on the sample surface became finer with an increase in the gas pressure. The nitrided layer with a greater and homogeneous thickness was obtained at a low gas pressure of 100 Pa.

    Keywords:

    surface engineering, cathodic cage, edging effect, active screen plasma nitriding, stainless steel


    Author Information:

    Nishimoto, Akio
    Dept. of Chemistry and Materials Engineering, Kansai Univ., Osaka,

    Nagatsuka, Kimiaki
    Graduate School of Science and Engineering, Kansai Univ., Osaka,

    Narita, Ryota
    Graduate School of Science and Engineering, Kansai Univ., Osaka,

    Nii, Hiroaki
    Graduate School of Science and Engineering, Kansai Univ., Osaka,

    Akamatsu, Katsuya
    Dept. of Chemistry and Materials Engineering, Kansai Univ., Osaka,


    Paper ID: STP153220120023

    Committee/Subcommittee: D02.L0

    DOI: 10.1520/STP153220120023


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