scholarly journals Dry Sliding Wear Behavior of AISI310 Stainless Steel with Low Temperature Salt Bath Nitriding and Gas Nitriding Processes

2019 ◽  
Vol 9 (1) ◽  
pp. 470-473
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Salt Bath ◽  
S Phase ◽  
Dry Sliding Wear ◽  
Wear Loss ◽  
Phase Layer ◽  
Gas Nitriding ◽  
Nitrided Sample ◽  
Minimum Wear

AISI 310 is an austenitic stainless steel that accomplished in high thermal applications like turbines, boiler parts etc. In this study AISI310 was treated with salt bath nit- -riding for 60min, 120min and 150min and gas nitriding for 6hrs, 12hrs and 18hrs at the temperature of 5700 c respectively. Comparison study of nitrided specimens were performed under various metallographic tests like scanning electron microscope, X-ray Diffraction, pin on disc apparatus. Experimental results shown that when salt bath nitrided sample at 150min showed a white layer called “S-phase” layer which was detected. In gas nitriding also “S-phase” layer, an expanded austenite was observed, after 18 hrs, CrN phase was discovered after the decomposition of s-phase layer gas nitrided sample of 18hrs which showed the best corrosion resistance .Salt bath specimen 150 min showed minimum wear loss and gas nitrided sample of 18hrs showed more hardness, minimum wear and improved corrosion resistance compared to untreated sample.

Effect of Gas Content and Treatment Temperature on the Characteristic of Surface Layers of Low Temperature Plasma Nitrided 316L Austenitic Stainless Steel

2018 ◽  
Vol 941 ◽  
pp. 1784-1789
Author(s):  
Insup Lee
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Surface Hardness ◽  
Treatment Temperature ◽  
S Phase ◽  
Gas Content ◽  
Low Temperature Plasma ◽  
Temperature Plasma ◽  
Phase Layer ◽  
316L Austenitic Stainless Steel

The effect of gas content and treatment temperature on the surface characteristics of hardened layers of low temperature plasma nitrided 316L Austenitic Stainless Steel was investigated. The process was performed at fixed processing time at 15Hr and changing the N2content from 10% to 25%, changing the treatment temperature from 370 °C to 430 °C. The surface hardness and the thickness of expanded austenite (S-Phase) layer increase with increasing both temperature and nitrogen content. At 430°C processing temperature and 25% N2content, the S-phase layer thickness increased up to 13 μm and surface hardness increased about 3.5 times of that of untreated sample which is 880 HV0.1(before treatment 250HV0.1hardness). However, the XRD pattern of the this sample shows the presence of γ'-(Fe,Cr)4N precipitation on the surface which is the reason for the increased corrosion current density that results in increased corrosion rate. Thus the corrosion resistance degrades and presents even worst behavior comparing that of before treatment. Therefore, for increasing the corrosion behavior, further research was conducted by fixing the N2content at 10% with changing the CH4content from 0% to 5%. The best results were found when treated at 430°C with 5% CH4content. At this condition the S-phase thickness increase to around 17μm and surface hardness (980 HV0.1) is improved about 3.9 times of the hardness of untreated one. This sample also showed superior corrosion resistance than the other treated samples and the untreated one due to much higher pitting potential.

Structure of Nitrided Layer Formed on Austenitic Stainless Steel by a New Gas Nitriding Process

2008 ◽  
Vol 273-276 ◽  
pp. 245-249
Author(s):  
Hisao Fujikawa ◽  
Takanori Watanabe
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Lattice Strain ◽  
Nitrided Layer ◽  
S Phase ◽  
The Other ◽  
Nitriding Temperature ◽  
Gas Nitriding ◽  
Good Corrosion Resistance ◽  
Type 304

The nitrided layer formed on Type 304 steel after gas nitriding was studied using TEM and so on. (1) Dependency of the nitriding temperature and time on the depth of the nitrided layer was studied. The following equation was obtained. L2=8.7*108*EXP(-146,000/RT)*t (2) Nitrided layer formed at both 570°C for 3 hrs and 410°C for 48 hrs had high density of dislocation, stacking fault and lattice strain. (3) Nitrided layer formed at 570°C was mainly composed of є-Fe3N, and had much Fe4N and CrN. (4) On the other hand, the nitrided layer formed at 410°C was mainly composed of S-phase, є-Fe3N was not detected and Fe4N and CrN were very little. N content in the nitrided layer formed at 410°C was about 7-8 mass%. (5) Nitrided layer formed at 410°C showed good corrosion resistance.

Low-Temperature Plasma Surface Modification of Medical Grade Austenitic Stainless Steel to Combat Wear and Corrosion

2008 ◽  
Vol 373-374 ◽  
pp. 296-299 ◽  
Author(s):  
Joseph P. Buhagiar ◽  
Han Shan Dong
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Low Temperature ◽  
S Phase ◽  
Low Temperature Plasma ◽  
Temperature Plasma ◽  
Phase Layer ◽  
Wear And Corrosion ◽  
Medical Grade

The novel low temperature plasma alloying technique that simultaneously introduces both nitrogen and carbon into the surface of austenitic stainless steel has been used in the past to create a hybrid N-C S-Phase. This S-Phase layer boasts of high hardness and wear resistance without any detriment to corrosion resistance. In this study, the afore mentioned hybrid N-C S-Phase was successfully implemented in the surface of two medical grade austenitic stainless steels: ASTM F138 and F1586. At an optimum process temperature of 430°C a very hard, 20μm precipitate-free S-Phase layer was created. Anodic Polarization tests in Ringer’s solution showed that the corrosion resistance of this layer was similar to that of the untreated alloys. Both dry-wear and corrosion-wear (Ringer’s) behaviour of the surface treated alloys showed an improvement of more than 350% and 40% respectively when compared to the untreated material.

Effect of CH4 Content on the Characteristics of Surface Layers of Low Temperature Plasma Nitrided 2205 Duplex Stainless Steel

2016 ◽  
Vol 879 ◽  
pp. 1074-1079 ◽  
Author(s):  
Insup Lee
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Duplex Stainless Steel ◽  
Layer Thickness ◽  
Plasma Nitriding ◽  
Surface Hardness ◽  
S Phase ◽  
Temperature Plasma ◽  
Phase Layer ◽  
2205 Duplex Stainless Steel

Plasma nitriding was performed on the 2205 duplex stainless steel samples at 400 V with a gas mixture of H2 and N2 for 15 hrs with changing N2 percent, temperature and adding various amounts of CH4. After treatment the behavior of the surface layer was investigated by optical microscopy, X-ray diffraction, GDOES analysis and micro-hardness testing. Potentiodynamic polarization test was also used to evaluate the corrosion resistance of the samples. With increasing both N2 percentage from 10% to 25% and nitriding temperature from 370°C to 430°C, the thickness of nitrogen expanded austenite (S-phase) layer and surface hardness increase up to 16 μm and 1200 HV0.1 at the treatment temperature of 430°C with 25% N2, but decreases the corrosion resistance due to the formation of Cr2N and γ`(Fe, Cr)4N. Thus in order to further increase the thickness of S-phase layer and the corrosion resistance, the influence of adding various amount of CH4 (1% to 5%) in the nitriding atmosphere was investigated. Adding CH4 in the nitriding atmosphere increases the layer thickness compared with that of nitrided sample. The highest thickness can be obtained at 1 % CH4, but addition of CH4 beyond 1 % slightly decreases the layer thickness. Moreover, when nitrided at 400°C with 10% N2 and 5% CH4 content, best corrosion behavior is obtained which also have around 10 μm layer thickness and about 870 HV0.1 surface hardness.

EFFECT OF PLASMA NITRIDING TEMPERATURES ON CHARACTERISTICS OF AISI 201 AUSTENITIC STAINLESS STEEL

2016 ◽  
Vol 23 (01) ◽  
pp. 1550084 ◽  
Author(s):  
YUXIN GAO ◽  
SHAOMEI ZHENG
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Plasma Nitriding ◽  
Nitrided Layer ◽  
Surface Hardness ◽  
Electrochemical Corrosion ◽  
S Phase ◽  
Phase Identification ◽  
Phase Layer

Samples of AISI 201 austenitic stainless steel were produced by plasma nitriding at 350[Formula: see text]C, 390[Formula: see text]C, 420[Formula: see text]C, 450[Formula: see text]C and 480[Formula: see text]C for 5[Formula: see text]h. Systematic characterization of the nitrided layer was carried out in terms of micrograph observations, phase identification, chemical composition depth profiling, surface microhardness measurements and electrochemical corrosion tests. The results show that the surface hardness and the layer thickness increased with increasing temperature. XRD indicated that a single S-phase layer was formed during low temperature ([Formula: see text][Formula: see text]420[Formula: see text]C), while Cr2N or CrN phase was formed besides S-phase when nitrided at 450[Formula: see text]C and 480[Formula: see text]C. The specimen treated at 390[Formula: see text]C presents a much enhanced corrosion resistance compared to the untreated substrate. The corrosion resistance deteriorated for samples treated above 450[Formula: see text]C due to the formation of chromium nitrides.

scholarly journals Investigation on Dry Sliding Wear Performance and Corrosion Resistance of 13Cr5Ni2Mo Supermartensitic Stainless Steel

2021 ◽  
Vol 43 (1) ◽  
pp. 107-116
Author(s):  
N.E. Beliardouh ◽  
S. Tlili ◽  
A. Oulabbas ◽  
C.E. Ramoul ◽  
S. Meddah ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Sliding Wear ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Wear Performance ◽  
Supermartensitic Stainless Steel

scholarly journals Investigation of Mechanical Properties of AISI 316 Stainless Steel by Carbonitriding Process

2020 ◽  
Vol 184 ◽  
pp. 01018
Author(s):  
A Rohit Sai Krishna ◽  
B Vamshi Krishna ◽  
D Harshith ◽  
T Sashank ◽  
Ram Subbiah
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Wear Behavior ◽  
Wear Test ◽  
Salt Bath ◽  
Wear Loss ◽  
Case Hardening ◽  
Wide Range ◽  
Pin On Disc ◽  
Aisi 316 Stainless Steel

This project investigates on salt bath nitriding process in order to improve the wear behavior of the material. This process increases the hardness of the material. The specimens were nitrided at 580°c on three different timing hours such as 60 minutes, 90 minutes & 120 minutes. A pin on disc machine is used to conduct wear test, so that wear loss can be determined. The specimens are to be magnified by metallographic test like scanning electron microscope. The untreated specimen is used to compare with the nitrided specimen. The best specimen is chosen which determines the life of material & improves the better wear resistance. The hardness of untreated material and nitrided material are compared. The material AISI stainless steel has many unique properties but it lacks wear resistance and hardness because of which it has limited applications. By conducting heat treatment operation, the hardness of the material does not improve, but by conducting case hardening process the hardness of the outer case will be high compared to base metal. If the hardness and wear resistance of the material improves the material can be used in wide range of applications.

Effect of molybdenum and copper on S-phase layer thickness of low-temperature carburized austenitic stainless steel

2008 ◽  
Vol 202 (22-23) ◽  
pp. 5488-5492 ◽  
Author(s):  
M. Tsujikawa ◽  
M. Egawa ◽  
N. Ueda ◽  
A. Okamoto ◽  
T. Sone ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Low Temperature ◽  
Layer Thickness ◽  
S Phase ◽  
Phase Layer
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