Modification of Stainless Steels Surface Layers by Nitriding and Carbonitriding

2013 ◽  
Vol 712-715 ◽  
pp. 12-16 ◽  
Author(s):  
Маzhyn Skakov ◽  
Sherzod Kurbanbekov ◽  
Michail Scheffler ◽  
Azretay Naltaev
Keyword(s):  
Stainless Steel ◽  
Stainless Steels ◽  
Plasma Nitriding ◽  
Plasma Processing ◽  
High Hardness ◽  
Carbon Steels ◽  
Low Carbon ◽  
Surface Layers ◽  
Low Carbon Steels ◽  
Martensite Structure

The structure of low-carbon steels after saturation by nitrogen and carbon in the mode of electrolytic-plasma nitriding and carbonitriding on the surface structure of austenitic stainless steel 12Cr18Ni10Ti has been studied. Optimum modes of electrolytic-plasma nitriding and carbonitriding are determined ensuring the maximum saturation of nitrogen and carbon, the microhardness of the surface. It is established, that after electrolyte-plasma processing microstructure of steel 12Cr18Ni10Ti has martensite structure. As a result of the research it is revealed that steel 12Cr18Ni10Ti after the electrolyte-plasma processing has high hardness.

Nitriding and Carbonitriding Influence on Stainless Steels Surface Layers Changes

2013 ◽  
Vol 379 ◽  
pp. 105-109 ◽  
Author(s):  
Маzhyn Skakov ◽  
Sherzod Kurbanbekov ◽  
Yerkezhan Tabieva ◽  
Erkin Zamanbekuly
Keyword(s):  
Stainless Steel ◽  
Stainless Steels ◽  
Plasma Nitriding ◽  
Plasma Processing ◽  
High Hardness ◽  
Carbon Steels ◽  
Low Carbon ◽  
Surface Layers ◽  
Low Carbon Steels ◽  
Martensite Structure

The structure of low-carbon steels after saturation by nitrogen and carbon in the mode of electrolytic-plasma nitriding and carbonitriding on the surface structure of austenitic stainless steel 12Cr18Ni10Ti has been studied. Optimum modes of electrolytic-plasma nitriding and carbonitriding are determined ensuring the maximum saturation of nitrogen and carbon, the microhardness of the surface. It is established, that after electrolyte-plasma processing microstructure of steel 12Cr18Ni10Ti has martensite structure. As a result of the research it is revealed that steel 12Cr18Ni10Ti after the electrolyte-plasma processing has high hardness.

A Thermodynamic Database for Fe-Cr-Mn-Ni-Ti-S-C-N System

2005 ◽  
Vol 500-501 ◽  
pp. 711-718 ◽  
Author(s):  
Katsunari Oikawa ◽  
Hajime Mitsui ◽  
Kiyohito Ishida
Keyword(s):  
Complex System ◽  
Experimental Data ◽  
Phase Diagram ◽  
Thermodynamic Properties ◽  
Stainless Steels ◽  
Carbon Steels ◽  
Thermodynamic Database ◽  
Low Carbon ◽  
Low Carbon Steels ◽  
Good Agreement

A database for thermodynamic information of sulfides and carbo-sulfide in steels has been developed, where the thermodynamic properties of the relevant constituting sub-system of the complex system have been assessed by the CALPHAD (Calculation of Phase Diagrams) approach. The utility of this database is demonstrated in examples of phase diagram calculations of low carbon steels and stainless steels. The calculated results are in good agreement with experimental data. The developed thermodynamic database would be useful in predicting the formation of sulfides and carbo-sulfides in the commercial steels.

Simulating the Topology of Recrystallization in Stabilized Ferritic Stainless Steels

2004 ◽  
Vol 467-470 ◽  
pp. 671-676 ◽  
Author(s):  
Chad W. Sinclair ◽  
D. Weygand ◽  
J. Lépinoux ◽  
Yves Bréchet
Keyword(s):  
Stainless Steels ◽  
Carbon Steels ◽  
Ferritic Steels ◽  
Two Dimensional ◽  
Low Carbon ◽  
Microstructural Characteristics ◽  
Ferritic Stainless Steels ◽  
Low Carbon Steels ◽  
Cold Rolled ◽  
Key Features

The observation of inhomogeneous, ‘sluggish’ recrystallization in ferritic steels has been extensively documented and discussed, particularly with reference to low carbon steels. Stabilized ferritic stainless steels are also prone to this phenomenon and, in many cases, exhibit the effect more strongly than their carbon counterparts. The situation for stainless steels is exacerbated in part by the topology of the cold rolled microstructure, which is composed of highly elongated and layered grains. In this work an attempt has been made to probe the key features of this process by means of a two-dimensional vertex simulation. Key microstructural characteristics such as subgrain and grain size, topology, misorientation and energy are varied in these simulations in an attempt to elucidate the mechanisms responsible for the final recrystallization. These simulations are compared and contrasted with experimental observations from the recrystallization of an AISI409 stainless steel.

Fatigue Properties of Steels with Ultrasonic Attrition Treated Surface Layers

2008 ◽  
Vol 604-605 ◽  
pp. 239-248 ◽  
Author(s):  
J. Uusitalo ◽  
L. Pentti Karjalainen ◽  
Delphine Retraint ◽  
M. Palosaari
Keyword(s):  
Stainless Steels ◽  
Crack Nucleation ◽  
Pearlitic Steel ◽  
Fatigue Behaviour ◽  
Carbon Steels ◽  
Fatigue Properties ◽  
Low Carbon ◽  
Surface Layers ◽  
Steel Sheets ◽  
Strain Induced Martensite

Severely deformed surface layers have been created by ultrasonic attrition technique on four steel sheets to investigate their influence on fatigue behaviour. A low-carbon (0.05%) ferritic steel and a medium-carbon (0.47%) normalized ferritic-pearlitic steel were selected to study the effect of carbon content on fatigue properties of carbon steels. Two stainless steels, Type 316L and Type 301LN, were also tested to study the influence of stability of the austenitic structure. Microstructural features were characterized by hardness measurements, X-ray diffraction and optical and electron microscopy. Fatigue properties were determined in flexural bending in the range 104 to 107 cycles. Crack nucleation and propagation stages were followed. In the attrition treatment thin severely deformed surface layers were found to form. Highly increased hardness was measured in these layers, especially for stainless steels, where also strain-induced martensite was formed. Drastic improvement in fatigue resistance was observed for all steels due to the surface nanocrystallization treatment.

Microstructure Refinement of a Low Interstitial Ferritic Stainless Steel by Cold Rolling and Annealing of Martensite

2007 ◽  
Vol 558-559 ◽  
pp. 113-118
Author(s):  
H. Azizi-Alizamini ◽  
Chad W. Sinclair ◽  
Matthias Militzer ◽  
J.D. Mithieux
Keyword(s):  
Stainless Steel ◽  
Cold Rolling ◽  
Uniform Elongation ◽  
Carbon Steels ◽  
Processing Route ◽  
Low Carbon ◽  
Low Carbon Steels ◽  
Microstructure Refinement ◽  
Cold Rolling And Annealing ◽  
Cold Rolled

Several studies have shown that recrystallization of cold rolled martensite results in low carbon steels with very fine microstructures. Correspondingly, these materials exhibit promising combinations of strength and elongation. Most of the work on this processing route has focused on low carbon steels (0.1-0.2wt% carbon) where the interstitial content may play an important role in the microstructure refinement. In this note we describe experiments performed on a low interstitial stainless steel containing 0.02wt%C. It has been possible to achieve materials with high strengths (UTS > 1 GPa) and significant uniform elongation (> 8%), however, the microstructures associated with these properties are very different from those previously reported for low carbon steels.

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