scholarly journals X-Ray Fractography for (.ALPHA.+.GAMMA.) Dual Phase Stainless Steels Using Parameter .DELTA..EPSILON.P Obtained from Micromechanics

2004 ◽  
Vol 53 (2) ◽  
pp. 157-162 ◽  
Author(s):  
Hajime HIROSE ◽  
Toshihiko SASAKI ◽  
Masumi SAKA
Keyword(s):  
Stainless Steels ◽  
Dual Phase ◽  
X Ray

Detecting Critical Crevice Temperature for Duplex Stainless Steels in Chloride Solutions

CORROSION ◽  
2011 ◽  
Vol 67 (2) ◽  
pp. 025004-1-025004-7 ◽  
Author(s):  
D. Han ◽  
Y. Jiang ◽  
B. Deng ◽  
L. Zhang ◽  
J. Gao ◽  
...  
Keyword(s):  
Stainless Steels ◽  
Crevice Corrosion ◽  
Electrochemical Method ◽  
Duplex Stainless Steels ◽  
Good Reproducibility ◽  
X Ray ◽  
Initiation Step ◽  
Critical Pitting Temperature ◽  
Preferential Dissolution ◽  
Scanning Electron

Abstract A simple and rapid electrochemical method for the evaluation of crevice corrosion in duplex stainless steels (DSS) is described. Three types of DSS—namely, UNS S32101, UNS S31803, and UNS S32750—were tested in 1 mol/L sodium chloride (NaCl) solutions. Results showed good reproducibility with a typical standard deviation of below 3°C. The critical pitting temperature (CPT) for the same specimens was also investigated in 1 mol/L NaCl solutions. An approximately 20°C decrease from CPT to critical crevice temperature (CCT) was observed and subsequently explained. Then, the morphologies of crevice corrosion were studied using scanning electron microscopy with energy-dispersive x-ray spectroscopy (SEM/EDS) method. The SEM/EDS study revealed that the ferrite phase was the site where preferential dissolution took place at the initiation step of crevice corrosion, which was in accordance with the prediction by calculating the critical crevice index. Moreover, repassivation was detected with the development of crevice corrosion. The reason was clarified by combining the results obtained with a successful diffusion model, and eventually the crevice corrosion progress was illustrated schematically.

scholarly journals Chemical, electrochemical, thermodynamic and adsorption study of EN8 dual-phase steel with ferrite-martensite structure in 0.5 M H2SO4 using pectin as inhibitor

2021 ◽  
Author(s):  
P. R. Prabhu ◽  
Pavan Hiremath ◽  
Deepa Prabhu ◽  
M. C. Gowrishankar ◽  
B. M. Gurumurthy
Keyword(s):  
Weight Loss ◽  
Adsorption Isotherm ◽  
Surface Analysis ◽  
Potentiodynamic Polarization ◽  
Dual Phase Steel ◽  
Inhibition Efficiency ◽  
Dual Phase ◽  
X Ray ◽  
Enthalpy And Entropy ◽  
Martensite Structure

AbstractThis paper presents the corrosion and inhibition behavior of heat-treated EN8 dual-phase steel with ferrite-martensite structure with pectin in 0.5 M sulphuric acid. The corrosion studies were performed using the weight loss method, electrochemical techniques such as potentiodynamic polarization measurements, and impedance spectroscopy. The study was done at different concentrations of pectin in the temperature range of 40 to 70 °C and immersion time of 1, 3, 5, and 7 h. The results showed that the inhibition performance of pectin has enhanced with an increase in pectin concentration and decreased with the temperature and time of exposure. From the weight loss study, highest inhibition efficiency of 76.43% was achieved at 5.0 g/L at 1 h of exposure at 40 °C. The maximum inhibition efficiency of 62% was obtained with 5.0 g/L of pectin at 40 °C by potentiodynamic polarization method. The energy, enthalpy, and entropy of activation and also thermodynamic parameters like free energy, enthalpy, and entropy of adsorption were assessed and discussed. Appropriate adsorption isotherm was fit to the obtained experimental outcomes and achieved Langmuir adsorption isotherm to be the best fit and obeyed physical adsorption. Surface analysis: scanning electron microscopy, X-ray diffraction techniques, atomic force microscopy, and energy dispersive X-ray were done with and without the addition of pectin. The metal surface appears to be uniform and smooth in the presence of pectin and adsorption was confirmed by surface analysis.

X-ray diffraction characterisation of expanded austenite and ferrite in plasma nitrided stainless steels

2010 ◽  
Vol 26 (4) ◽  
pp. 265-270 ◽  
Author(s):  
L. C. Gontijo ◽  
R. Machado ◽  
L. C. Casteletti ◽  
S. E. Kuri ◽  
P. A. P. Nascente
Keyword(s):  
Stainless Steels ◽  
X Ray Diffraction ◽  
X Ray ◽  
Expanded Austenite

A Model for the Hydrogen Diffusion in Dual-Phase Stainless Steels for High-Pressure Applications

2021 ◽  
Author(s):  
Marco Beghini ◽  
GIUSEPPE MACORETTA ◽  
Bernardo Disma Monelli ◽  
Renzo Valentini ◽  
Linda Bacchi
Keyword(s):  
High Pressure ◽  
Stainless Steels ◽  
Hydrogen Diffusion ◽  
Dual Phase

scholarly journals X-Ray Residual Stress and Strain-Induced Transformation of Retained Austenite in TRIP-Aided Dual-Phase Steels.

1995 ◽  
Vol 61 (581) ◽  
pp. 80-86 ◽  
Author(s):  
Koh-Ichi Sugimoto ◽  
Mitsuyuki Kobayashi ◽  
Hidehiro Matsushima ◽  
Shun-ichi Hashimoto
Keyword(s):  
Residual Stress ◽  
Retained Austenite ◽  
Stress And Strain ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
X Ray

scholarly journals Atmospheric Plasma Spraying (APS) and Alloying as Methods to Modify Properties of the SSS Surface Layers

2020 ◽  
Vol 22 (4) ◽  
pp. 80-89
Author(s):  
Barbara Lisiecka ◽  
Agata Dudek ◽  
Robert Ulewicz
Keyword(s):  
Automotive Industry ◽  
Stainless Steels ◽  
Arc Welding ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Surface Layers ◽  
X Ray ◽  
Gas Tungsten Arc ◽  
Roughness Measurements ◽  
Scanning Electron

Use of the powder metallurgy (PM) in production of various components has been growing in the automotive industry, including production of sintered stainless steels (SSSs). This study aims to improve the functional properties of SSSs by formation of the Cr3C2-NiCr coating by APS method. The next stage involved alloying of the surface of SSSs using the gas tungsten arc welding (GTAW). Analysis of microstructures was carried out using microscopy (metallographic microscope and scanning electron microscope). Furthermore, the study presents XRD (X-ray powder diffraction) examinations, mechanical properties and surface roughness measurements. The presented modification improved properties of the surface layers examined in the study and enabled a reduction in the wall thickness of the detail, which is important factor in the automotive and transport industry.

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