scholarly journals Application Of Active Screen Method For Ion Nitriding Efficiency Improvement

2015 ◽  
Vol 60 (2) ◽  
pp. 1075-1077 ◽  
Author(s):  
M. Ogórek ◽  
T. Frączek ◽  
Z. Skuza
Keyword(s):  
Austenitic Steel ◽  
Emission Spectroscopy ◽  
Surface Hardness ◽  
Efficiency Improvement ◽  
Nitrogen Diffusion ◽  
Ion Nitriding ◽  
Aisi 304 ◽  
Hardness Tests ◽  
Steel Aisi ◽  
Surface Layer Thickness

Abstract Paper presents the research of austenitic steel AISI 304 after ion nitriding at 400°C and at t =4h, for the two different variants of samples distribution in the working plasma reactive chamber tube. In order to assess the effectiveness of ion nitriding variants emission spectroscopy – GDOES, surface hardness tests, microstructure research (LM) of nitrided layers were made. It has been found that the use of active screens increases the surface layer thickness and depth of nitrogen diffusion into austenitic steel 304.

Unconventional Short-Term Glow Discharge Nitriding of 316L Austenitic Steel

2010 ◽  
Vol 654-656 ◽  
pp. 366-369 ◽  
Author(s):  
Tadeusz Frączek ◽  
Michał Olejnik ◽  
Jarosław Jasiński
Keyword(s):  
Surface Layer ◽  
Glow Discharge ◽  
Austenitic Steel ◽  
Profile Analysis ◽  
Surface Hardness ◽  
Hardness Profile ◽  
Nitrogen Diffusion ◽  
Surface Layers ◽  
Hardness Tests ◽  
Layer Structures

The AISI 316L grade austenitic steel after glow discharge nitriding at a temperature of T = 598 K and for duration of  = 10,8 ks, for different variants of specimen arrangement in the glow-discharge chamber was investigated. In the first variant specimens were placed on the cathode and in the second variant specimens were positioned also on the cathode, but shielded with a booster screen. In order to assess the effectiveness of nitriding process variants a profile analysis examination of obtained surface layers, surface hardness tests and surface layer hardness profile examination, analysis of surface layer structures and corrosion resistance tests were carried out. It was found that application of a booster screen effects in a nitrogen diffusion depth increment into the 316L austenitic steel, resulting in a surface layer thickness escalation.

scholarly journals Study for Performance Increase of a Extractor Device by Steel Replacement of AISI 304 Steel for AISI 420 Steel

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 280
Author(s):  
Francisco Alves de Lima Júnior ◽  
Ricardo Artur Sanguinetti Ferreira ◽  
Rômulo Rocha de Araújo Lima
Keyword(s):  
Stainless Steel ◽  
Service Life ◽  
Tensile Tests ◽  
Mechanical Tests ◽  
Uniaxial Tensile ◽  
Manufacturing Cost ◽  
Aisi 304 ◽  
Aisi 420 ◽  
Hardness Tests ◽  
Steel Aisi

The performance of an extractor device used in the food industry was studied from the development of structural analysis through computational modeling based on finite elements. These analyses considered the mechanical properties of AISI 304 and 420 stainless steels, in addition to the tribological aspects of the device in operation. Initially, uniaxial tensile tests were carried out according to the ABNT NBR 6892 standard and hardness tests were carried out according to ASTM E384, E92, and E18 standards. From the mechanical tests, structural analyses were carried out numerically on each of the components of the extractor device. After analyzing all the components, the device was assembled to be tested in operation. The wear and service life of devices made from these two materials were evaluated. From this study, it could be concluded that the extractor device made with AISI 420 stainless steel, in addition to having a lower manufacturing cost, suffered less wear and had an increase in service life of up to 650% compared to the extractor device made with steel stainless steel AISI 304.

The Characteristics of Surface Layers Produced on SKD 61 Steel by Plasma Radical Nitriding Compared with Conventional Plasma Ion Nitriding

2006 ◽  
Vol 118 ◽  
pp. 155-160
Author(s):  
Insup Lee ◽  
Yong Ho Park ◽  
Ik Min Park
Keyword(s):  
Plasma Nitriding ◽  
Nitrided Layer ◽  
Surface Hardness ◽  
Compound Layer ◽  
Hardened Layer ◽  
Processing Parameters ◽  
Polished Surface ◽  
Nitrogen Diffusion ◽  
Ion Nitriding ◽  
Surface Layers

Plasma radical nitriding has been performed to harden the surface of SKD 61 steel for 1- 10 hours at temperature range of 450-550°C. A NH radical, which has played a key role to produce a nitrogen diffusion layer without the formation of the brittle compound layer, has been generated in a gas mixture of NH3 and H2 . One of the main advantages of the plasma radical nitriding is to improve the surface hardness by maintaining the roughness of the initial polished surface. The microstructures and material properties of the radical nitrided layer have been characterized in order to investigate the effects of various radical nitriding processing parameters. The hardness and surface roughness of the hardened layer were compared between two processes. In addition, PVD CrN coating has been deposited on both the radical nitrided substrates and conventional nitrided substrates by an arc ion plating (AIP) technique. The effect of two different of plasma nitriding treatments on the adhesive strength of the coating layer on the substrates was also investigated.

Diagnosis Of Damage In Austenitic Steel Aisi 304 At Mechanical Loading By Measurements Of Coercive Force

2019 ◽  
Vol 2019 (4) ◽  
pp. 12-24
Author(s):  
O.P. Gopkalo ◽  
◽  
V.O. Nekhotiashchiy ◽  
G.YA. Bezlyudko ◽  
YU.P. Kurash ◽  
...  
Keyword(s):  
Coercive Force ◽  
Austenitic Steel ◽  
Mechanical Loading ◽  
Aisi 304 ◽  
Steel Aisi

Hot Corrosion Studies on GTA Welded AISI 304, Monel 400 Subjected to Air Oxidation and Molten Salt Environment

2011 ◽  
Vol 383-390 ◽  
pp. 4688-4692
Author(s):  
Ramkumar K. Devendranath ◽  
N. Arivazhagan ◽  
S Narayanan
Keyword(s):  
Molten Salt ◽  
Hot Corrosion ◽  
Gta Welding ◽  
Xrd Analysis ◽  
Air Oxidation ◽  
Aisi 304 ◽  
Nickel Copper ◽  
Steel Aisi ◽  
Monel 400 ◽  
Marine Applications

An attempt was made to study the hot corrosion behavior on gas tungeten arc welded Austenitic stainless steel AISI 304 and Nickel-copper alloy Monel 400. These materials are widely used in power plant, petro-chemical and marine applications where the weldments are usually subjected to aggressive corrosion environment. GTA welding was carried out using ENiCu-7 and E308L filler wires. Various regions of the weldment of AISI 304, Monel 400 were exposed to the air oxidation as well as in the molten salt environment consist of K2SO4 + NaCl (60%) at 700°C. Mechanical properties of the weldments were also studied. The corrosion products of the weldments were analyzed using SEM/EDAX, XRD analysis.

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