Effect of Nitrocarburized Layer on the Resistivity Properties of Stainless Steels

2008 ◽  
Vol 47-50 ◽  
pp. 670-673 ◽  
Author(s):  
Yang Yu Su ◽  
Fan Shiong Chen ◽  
Liu Ho Chiu ◽  
Heng Chang
Keyword(s):  
Stainless Steels ◽  
Morphological Analysis ◽  
Single Phase ◽  
Nitrided Layer ◽  
Resistivity Measurement ◽  
S Phase ◽  
Surface Microhardness ◽  
Aisi 316 ◽  
Plasma Nitrocarburizing ◽  
Nitrocarburized Layer

In this study, the plasma nitrocarburizing has been used to treat AISI 316 austenitic and AISI 410 martensitic stainless steels. Treated specimens were characterized by means of morphological analysis, surface microhardness measurement, and resistivity measurement. Plasma nitrocarburizing at low temperature (420°C) produced a single phase nitrided layer of nitrogen and carbon expanded austenite (S phase) on the specimen surface, which considerably improved the resistivity property of AISI 316 austenitic stainless steel.

scholarly journals Nitriding Process Characterization of Cold Worked AISI 304 and 316 Austenitic Stainless Steels

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Waldemar Alfredo Monteiro ◽  
Silvio Andre Lima Pereira ◽  
Jan Vatavuk
Keyword(s):  
Stainless Steels ◽  
Nitrided Layer ◽  
Cold Work ◽  
Austenitic Stainless Steels ◽  
Aisi 304 ◽  
Process Characterization ◽  
Aisi 304 Steel ◽  
Expanded Austenite ◽  
Cold Worked ◽  
Aisi 316

The nitriding behavior of austenitic stainless steels (AISI 304 and 316) was studied by different cold work degree (0% (after heat treated), 10%, 20%, 30%, and 40%) before nitride processing. The microstructure, layer thickness, hardness, and chemical microcomposition were evaluated employing optical microscopy, Vickers hardness, and scanning electron microscopy techniques (WDS microanalysis). The initial cold work (previous plastic deformations) in both AISI 304 and 306 austenitic stainless steels does not show special influence in all applied nitriding kinetics (in layer thicknesses). The nitriding processes have formed two layers, one external layer formed by expanded austenite with high nitrogen content, followed by another thinner layer just below formed by expanded austenite with a high presence of carbon (back diffusion). An enhanced diffusion can be observed on AISI 304 steel comparing with AISI 316 steel (a nitrided layer thicker can be noticed in the AISI 304 steel). The mechanical strength of both steels after nitriding processes reveals significant hardness values, almost 1100 HV, on the nitrided layers.

scholarly journals Breakdown and Evolution of the Protective Oxide Scales of AISI 304 and AISI 316 Stainless Steels under High-Temperature Oxidation

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
K. A. Habib ◽  
M. S. Damra ◽  
J. J. Saura ◽  
I. Cervera ◽  
J. Bellés
Keyword(s):  
Stainless Steel ◽  
Stainless Steels ◽  
Breakdown Point ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Protective Oxide ◽  
Aisi 304 ◽  
316 Stainless Steel ◽  
Aisi 316 Stainless Steel ◽  
Aisi 316

The failure of the protective oxide scales of AISI 304 and AISI 316 stainless steels has been studied and compared at 1,000°C in synthetic air. First, the isothermal thermogravimetric curves of both stainless steels were plotted to determine the time needed to reach the breakdown point. The different resistance of each stainless steel was interpreted on the basis of the nature of the crystalline phases formed, the morphology, and the surface structure as well as the cross-section structure of the oxidation products. The weight gain of AISI 304 stainless steel was about 8 times greater than that of AISI 316 stainless steel, and AISI 316 stainless steel reached the breakdown point about 40 times more slowly than AISI 304 stainless steel. In both stainless steels, reaching the breakdown point meant the loss of the protective oxide scale of Cr2O3, but whereas in AISI 304 stainless steel the Cr2O3scale totally disappeared and exclusively Fe2O3was formed, in AISI 316 stainless steel some Cr2O3persisted and Fe3O4was mainly formed, which means that AISI 316 stainless steel is more resistant to oxidation after the breakdown.

scholarly journals Aluminum coating by fluidized bed chemical vapor deposition on austenitic stainless steels AISI 304 and AISI 316

DYNA ◽  
2015 ◽  
Vol 82 (189) ◽  
pp. 22-29
Author(s):  
Jose Luddey Marulanda-Arevalo ◽  
Saul Castañeda-Quintana ◽  
Francisco Javier Perez-Trujillo
Keyword(s):  
Chemical Vapor Deposition ◽  
Fluidized Bed ◽  
Stainless Steels ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Austenitic Stainless Steels ◽  
Aluminum Coating ◽  
Aisi 304 ◽  
Aisi 316

PEM Fuel Cell Separator with Thermally Nitrided Low Carbon Steel

2010 ◽  
Vol 654-656 ◽  
pp. 1823-1825
Author(s):  
Dae Geun Nam ◽  
Chang Yong Choi ◽  
Jae Ho Jang ◽  
Young Do Park ◽  
Nam Hyun Kang
Keyword(s):  
Corrosion Resistance ◽  
Fuel Cell ◽  
Carbon Steel ◽  
Stainless Steels ◽  
Nitrided Layer ◽  
Low Carbon Steel ◽  
Pem Fuel Cells ◽  
Low Carbon ◽  
Good Corrosion Resistance ◽  
Cell Separator

The separator is one of the most important parts in PEM fuel cells. Stainless steels are widely used as separator for its good mechanical properties and mass production. However, for a good chemical compatibility, stainless steels need to have high chromium content or surface treatment, which makes separator high cost. Low cost of separator is important for commercial use. In this study, conventional low carbon steel is used as base metal of separator. Low carbon steel is low at cost, but has poor chemical properties for separator. For a good corrosion resistance, low carbon steel needs to be surface treated. To make a uniform surface treated layer on low carbon steel, chromium is conventionally electroplated on the steel and thermally nitrided. Surface treated low carbon steel is investigated using microstructure and element analysis tools. Interfacial contact resistance and polarization test is applied for the properties of fuel cell separator. The results show that chromium nitrided layer uniformly formed on low carbon steel. And the surface treated steel showed a good corrosion resistance as a separator.

Tribocorrosion behaviours of AISI 310 and AISI 316 austenitic stainless steels in 3.5% NaCl solution

2016 ◽  
Vol 171 ◽  
pp. 239-246 ◽  
Author(s):  
Babatunde Abiodun Obadele ◽  
Anthony Andrews ◽  
Mxolisi Brendon Shongwe ◽  
Peter Apata Olubambi
Keyword(s):  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Nacl Solution ◽  
Aisi 316

scholarly journals Influence of free energy on the attachment of Salmonella Enteritidis and Listeria monocytogenes on stainless steels AISI 304 and AISI 316

LWT ◽  
2016 ◽  
Vol 69 ◽  
pp. 131-138 ◽  
Author(s):  
Letícia Sopeña Casarin ◽  
Fabrício de Oliveira Casarin ◽  
Adriano Brandelli ◽  
Júnia Novello ◽  
Sukarno Olavo Ferreira ◽  
...  
Keyword(s):  
Free Energy ◽  
Listeria Monocytogenes ◽  
Stainless Steels ◽  
Salmonella Enteritidis ◽  
Aisi 304 ◽  
Aisi 316
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