Cavitation Erosion Resistance of Austenitic Stainless Steel after Glow-Discharge Nitriding Process

2011 ◽  
Vol 183 ◽  
pp. 201-206
Author(s):  
Marek Szkodo ◽  
Artur Sitko ◽  
Maria Gazda
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Glow Discharge ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Optical Emission ◽  
Phase Identification ◽  
Surface Layers ◽  
Rotating Disc ◽  
Cavitation Erosion Resistance

This paper presents investigation of cavitation erosion resistance of nitrided austenitic stainless steel X5CrNi18-10. The diffusion layers were produced by using different parameters of reactive atmosphere (N2:H2). The microstructure, chemical composition and phase identification of the modified layer were examined using scanning electron microscopy, glow-discharge optical emission spectrometer and X-ray diffractometry, respectively. Cavitation erosion resistance of produced surface layers was investigated in a rotating disc facility. As a property characterizing the cavitation erosion resistance of manufactured surface layers were proposed incubation period and mass loss after 330 min of cavitation test. It was found that cavitation erosion resistance of modified surface layers is lower than reference material (not treated X5CrNi18-10 stainless steel).

scholarly journals Influence of Nitriding and Laser Remelting on Properties of Austenitic Stainless Steel Type X10CrNi18-8 and Cavitation Erosion Resistance

2016 ◽  
Vol 16 (2) ◽  
pp. 21-31
Author(s):  
A. Sitko ◽  
M. Szkodo ◽  
S. Kucharski
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Nitriding Process ◽  
Cavitation Resistance ◽  
Laser Remelting ◽  
Surface Layers ◽  
Steel Type ◽  
Cavitation Erosion Resistance

Abstract The paper presents properties of surface layers. Surface layers were obtained by using low temperature glow–discharge nitriding process and laser remelting carried out on austenitic stainless steel type X10CrNi18-8. Investigations were done by using an Ultra Nanoindentation Tester (UNHT) in the Warsaw Institute of Fundamental Technological Research. The influence of the above mentioned treatments on obtained surface layers is shown. The values of the Vickers hardness (HV), the irreversible indentation work (Wir), the reversible work (We) and the maximum depth (hmax) during indentation were determined using the method proposed by Oliver and Pharr [1]. On the basis of mechanical properties, the elasticity (Ie) and ductility (Iir) indexes were calculated. Moreover, microstructure cross-section of the austenitic stainless steel after nitriding process and laser remelting was observed using a scanning electron microscope. Cavitation test was performed at a vibratory rig with stationary specimen. On the basis of erosion curves the cavitation resistance was evaluated.

Cavitation Erosion Behavior of 18/8 Stainless Steel after Its Laser Alloying of Manganese

2006 ◽  
Vol 113 ◽  
pp. 513-516 ◽  
Author(s):  
Marek Szkodo
Keyword(s):  
Stainless Steel ◽  
Strain Hardening ◽  
Cavitation Erosion ◽  
Phase Identification ◽  
Surface Alloying ◽  
Rotating Disc ◽  
Initial Stage ◽  
Cavitation Intensity ◽  
Cavitation Behavior ◽  
Cavitation Erosion Resistance

The laser surface alloying of 18/8 stainless steel with Mn, was carried out by 6 kW cw CO2 laser. The microstructure, chemical composition and phase identification of the modified layer were examined using scanning electron microscopy, energy dispersive X-ray spectroscopy and Xray diffractometry, respectively. Cavitation behavior of produced layers was investigated in a rotating disc facility. Cavitation properties of laser-processed steel were calculated in the initial stage of erosion, on the surface of about 4 mm2, on which cavitation intensity was constant. As a property characterizing the cavitation erosion resistance of materials was proposed for the depth of strain hardening. It was found that presence of manganese in the amount of 7.31% causes the highest increase hardness after alloying and the lowest depth of strain hardening due to cavitation loading.

The Influence of Gas Mixture in the Glow-Discharge Nitriding Process of Austenitic Stainless Steel on Characteristic of Nitrided Cases

2011 ◽  
Vol 490 ◽  
pp. 282-287
Author(s):  
Artur Sitko ◽  
Marek Szkodo ◽  
Maria Gazda
Keyword(s):  
Stainless Steel ◽  
Chemical Composition ◽  
Austenitic Stainless Steel ◽  
Glow Discharge ◽  
Optical Emission ◽  
Nitriding Process ◽  
Emission Spectrometry ◽  
Gas Mixture ◽  
Phase Identification ◽  
X Ray

This paper presents investigations of nitrided cases after the glow-discharge nitriding process. The nitrided cases were obtained by using a different chemical composition of gas mixture at the temperature of 450OC. The glow-discharge nitriding process was carried out on austenitic stainless steel, grade of steel X5CrNi18-10. The chemical composition and phase identification of the nitrided cases were examined by using the glow-discharge optical emission spectrometry (GD-OES) and X-ray diffractometry (XRD)

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