Thickening of S-Phase and Sα-Phase of Various Stainless Steels Treated by Low Temperature Plasma Nitriding Using Screen

This study aimed to observe the thickening of S-phase and Sα-phase various stainless steels subjected low-temperature direct current plasma nitriding using screen (S-DCPN). Austenitic steel SUS304, ferritic SUS430, duplex SUS329J4L were treated two different screens for comparison, namely, a Ni plate cold commercial (SPCC) screen. Plasma was performed at 673 K 300 min under 75％ N2 + 25％ H2 atmosphere 100 Pa pressure mixed gas. After treatment, samples examined X-ray diffraction (XRD) glow discharge optical emission spectrometry (GD-OES), their cross-sectional microstructure surface an electron probe micro analyzer (EPMA). Nitrided also Vickers hardness pitting corrosion tests. Examination SUS304 revealed its higher resistance when done with due excess nitrogen diffusion into sample presence than SPCC In SUS430 samples, not be observed. When used during nitriding, less observed, along enhanced used. upon screen, observed higher, which attributed