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 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

scholarly journals HARDNESS OF NITRIDED LAYERS TREATED BY PLASMA NITRIDING

2020 ◽  
Vol 27 ◽  
pp. 53-56
Author(s):  
Zdeněk Joska ◽  
Zdeněk Pokorný ◽  
Jaromír Kadlec ◽  
Zbyněk Studený ◽  
Emil Svoboda
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Stainless Steels ◽  
Plasma Nitriding ◽  
Nitrided Layer ◽  
Surface Hardness ◽  
Austenitic Stainless Steels ◽  
Aisi 316L ◽  
Aisi 304 ◽  
Measurement Surface

Stainless steels, particularly the austenitic stainless grades are widely used in many industries due to good corrosion resistance, but very poor mechanical properties as surface hardness and wear resistance limit its possible use. Plasma nitriding is one of the few ways to increase the surface hardness of these steels, even though this will affect its corrosion resistance. This paper focuses on the description of the mechanical properties of nitrided layers in the two most widespread austenitic stainless steels AISI 304 and AISI 316L. The microstructure and properties of nitrided layers were evaluated by metallography and microhardness measurement. Surface properties of nitrided steels were characterized by Martens hardness. The results show that plasma nitriding created very hard nitrided layers with thickness about 40 μm and microhardness about 1300 HV0.05. Surface hardness measurements have shown that the maximum values for both steels are about 8.5 GPa, but have different behaviour under higher loads, when the AISI 316L nitrided layer began to crack on the surface and sink.

CARPENTER STAINLESS 18Cr-2Ni-12Mn

Alloy Digest ◽  
1979 ◽  
Vol 28 (6) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Stainless Steels ◽  
Cold Work ◽  
Austenitic Stainless Steels ◽  
Heat Treating ◽  
High Manganese ◽  
Aisi Type ◽  
Cold Worked ◽  
Type 304

Abstract CARPENTER STAINLESS 18Cr-2Ni-12Mn is a high-manganese, nitrogen-strengthened austenitic stainless steel with an excellent combination of toughness, ductility, strength, fabricability and corrosion resistance. It provides substantially higher yield and tensile strengths than AISI Type 304 and is comparable to Type 304 in corrosion resistance in many environments. It can be machined, cold worked, and welded using the same equipment and methods used for the conventional AISI 300 series austenitic stainless steels. It is nonmagnetic as annealed and after severe cold work. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SS-366. Producer or source: Carpenter.

Study on the Intergranular Corrosion of Cold Worked Austenitic Stainless Steels

1986 ◽  
Vol 8 ◽  
pp. 593-604 ◽  
Author(s):  
Gianni Rondelli ◽  
B. Mazza ◽  
Tommaso Pastore ◽  
Bruno Vicentini
Keyword(s):  
Stainless Steels ◽  
Intergranular Corrosion ◽  
Austenitic Stainless Steels ◽  
Cold Worked

scholarly journals Hot workability of AISI 321 and AISI 304 austenitic stainless steels

2014 ◽  
Vol 595 ◽  
pp. 103-112 ◽  
Author(s):  
Richard K.C. Nkhoma ◽  
Charles W. Siyasiya ◽  
Waldo E. Stumpf
Keyword(s):  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Hot Workability ◽  
Aisi 304 ◽  
Aisi 321

scholarly journals Annealing of Cold-worked Austenitic Stainless Steels.

2003 ◽  
Vol 43 (2) ◽  
pp. 135-143 ◽  
Author(s):  
Angelo Fernando Padilha ◽  
Ronald Lesley Plaut ◽  
Paulo Rangel Rios
Keyword(s):  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Cold Worked

Effect of recrystallization on degree of sensitization in nickel free austenitic stainless steel

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sourabh Shukla ◽  
Awanikumar P. Patil ◽  
Ashlesha Kawale ◽  
Anand Babu Kotta ◽  
Inayat Ullah
Keyword(s):  
Stainless Steel ◽  
Thermal Aging ◽  
Thermomechanical Processing ◽  
Cold Work ◽  
Austenitic Stainless Steels ◽  
Content Type ◽  
High Deformation ◽  
Strain Induced Martensite ◽  
Degree Of Sensitization ◽  
Cold Worked

Purpose Effect of grain size on degree of sensitization (DOS) was been evaluated in Nickel free steel. Manganese and nitrogen contained alloy is a Ni-free austenitic stainless steels (ASS) having type 202 grade. The main purpose of this investigation is to find the effect of recrystallization on the DOS of stainless steel after the thermo-mechanical processing (cold work and thermal aging). Design/methodology/approach In the present investigation, the deformation of 202 grade analyzed using X-ray diffraction (XRD) and microstructural testing. Optical microstructure of Ni-free ASS has been done for cold worked samples with thermally aged at 900°C_6 h. Double loop electrochemical potentiodynamic reactivation test used for findings of degree of sensitization. Findings Ni-free ASS appears to be deformed more rapidly due to its higher stacking fault energy which gave results in rapid transformation from strain induced martensite to austenite in form of recrystallized grains, i.e. it concluded that as cold work percentage increases more rapidly recrystallization occurs. XRD results also indicate that more fraction of martensite formed as percentage of CW increases but as thermal aging reverted those all martensite to austenite. So investigation gives the conclusion which suggests that with high deformation at higher temperature and duration gives very less DOS. Originality/value Various literatures available for 300 series steel related to the effect of cold work on mechanical properties and sensitization mechanism. However, no one has investigated the effect of recrystallization through thermomechanical processing on the sensitization of nickel-free steel.

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.

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