Surface properties and activation energy of superplastically carburized duplex stainless steel

2010 ◽  
Vol 122 (2-3) ◽  
pp. 454-458 ◽  
Author(s):  
Nor Wahida Ahamad ◽  
Iswadi Jauhari ◽  
Sharidah Azuar Abdul Azis ◽  
Nur Hafizah Abd Aziz
Keyword(s):  
Activation Energy ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Surface Properties

Surface properties and activation energy analysis for superplastic carburizing of duplex stainless steel

2007 ◽  
Vol 466 (1-2) ◽  
pp. 230-234 ◽  
Author(s):  
Iswadi Jauhari ◽  
Shaifulazuar Rozali ◽  
Nik Rozlin Nik Masdek ◽  
Ogiyama Hiroyuki
Keyword(s):  
Activation Energy ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Surface Properties ◽  
Energy Analysis

scholarly journals Effect of Low-Temperature Plasma Nitriding on Corrosion and Surface Properties of Duplex Stainless Steel UNS S32205

2020 ◽  
Vol 29 (4) ◽  
pp. 2612-2622
Author(s):  
Yamid E. Núñez de la Rosa ◽  
Oriana Palma Calabokis ◽  
Paulo César Borges ◽  
Vladimir Ballesteros Ballesteros
Keyword(s):  
Stainless Steel ◽  
Low Temperature ◽  
Duplex Stainless Steel ◽  
Surface Properties ◽  
Plasma Nitriding ◽  
Low Temperature Plasma ◽  
Temperature Plasma

Enhancing Surface Properties of Fine Grain Duplex Stainless Steel via Superplastic Carburizing

2006 ◽  
Vol 15-17 ◽  
pp. 768-773 ◽  
Author(s):  
Nik Rozlin Nik Masdek ◽  
Iswadi Jauhari ◽  
Hiroyuki Ogiyama ◽  
Rafidah Hasan
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Surface Properties ◽  
Surface Hardness ◽  
Carbon Diffusion ◽  
Carbon Layer ◽  
Case Depth ◽  
Fine Grain ◽  
New Type ◽  
Kinetics Of

In this research, a new type of surface carburizing method which combines superplastic phenomenon and carburizing process called superplastic carburizing (SPC) was introduced. Thermo-mechanically treated duplex stainless steel (DSS) with fine grain microstructure and exhibits superplasticity was used as the superplastic material. The SPC was conducted at temperatures ranging from 1123 K to 1223 K for various durations. Initial loads of 25 MPa, 49 MPa and 74 MPa were applied to give the superplastic deformation effect on the carburized specimens. Metallographic studies revealed a thick, uniform, smooth and dense morphology of hard carbon layer formed at the surface of fine grain DSS. The resulting case depth of carbon layers were between 15 μm to 76 μm. A remarkable increase in surface hardness was observed in the range of 600 HV to 1600 HV. The kinetics of this process in terms of carbon diffusion and its variation with processing time and temperature was achieved using Arrhenius equation. Activation energy (Q) was determined as 151.87 kJ/mol. Based on the results obtained, SPC process can significantly enhance the surface properties of DSS.

Identification by Electron Microdiffraction of Intermetallic Phases in a Duplex Stainless Steel

1990 ◽  
Vol 48 (2) ◽  
pp. 494-495
Author(s):  
A. Redjaïmia ◽  
J.P. Morniroli ◽  
G. Metauer ◽  
M. Gantois
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Convergent Beam Electron Diffraction ◽  
Intermetallic Phases ◽  
Small Particles ◽  
Parallel Beam ◽  
Diffraction Patterns ◽  
Average Size ◽  
Convergent Beam ◽  
Electron Microdiffraction

2D and especially 3D symmetry information required to determine the crystal structure of four intermetallic phases present as small particles (average size in the range 100-500nm) in a Fe.22Cr.5Ni.3Mo.0.03C duplex stainless steel is not present in most Convergent Beam Electron Diffraction (CBED) patterns. Nevertheless it is possible to deduce many crystal features and to identify unambiguously these four phases by means of microdiffraction patterns obtained with a nearly parallel beam focused on a very small area (50-100nm).From examinations of the whole pattern reduced (RS) and full (FS) symmetries the 7 crystal systems and the 11 Laue classes are distinguished without ambiguity (1). By considering the shifts and the periodicity differences between the ZOLZ and FOLZ reflection nets on specific Zone Axis Patterns (ZAP) which depend on the crystal system, the centering type of the cell and the glide planes are simultaneously identified (2). This identification is easily done by comparisons with the corresponding simulated diffraction patterns.

DETECTION OF THE SIGMA PHASE IN A DUPLEX STAINLESS STEEL THROUGH MEASUREMENTS OF MAGNETIC PERMEABILITY

2019 ◽  
Author(s):  
Edgard Silva ◽  
Francisco Eduardo Mendes da Silva ◽  
Amanda Medeiros ◽  
Ana Paula Alves Pacheco ◽  
IZAURA VIEGAS ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Magnetic Permeability ◽  
Sigma Phase
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