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

2006 ◽  
pp. 768-773
Author(s):  
Nik Rozlin Nik Masdek ◽  
Iswadi Jauhari ◽  
Hiroyuki Ogiyama ◽  
Rafidah Hasan
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Surface Properties ◽  
Fine Grain

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.

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

A Study on Boronizing of Duplex Stainless Steel

2006 ◽  
Vol 306-308 ◽  
pp. 887-892 ◽  
Author(s):  
Rafidah Hasan ◽  
Iswadi Jauhari ◽  
S.M. Yunus ◽  
Raden Dadan Ramdan ◽  
Nik Rozlin Nik Masdek
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Layer Thickness ◽  
Surface Hardness ◽  
Boride Layer ◽  
Grain Sizes ◽  
Fine Grain ◽  
Surface Contact

Boronizing is a method to increase the surface hardness of engineering components [1]. This is beneficial especially when the components are always in surface contact with other materials. In this study, boronizing treatment was successfully done on duplex stainless steel (DSS). Two types of DSS with different microstructure were boronized – the as-received DSS and the fine grain DSS. The morphology of boride layer formed on boronized DSS is compact and smooth. The boride layer thickness for both DSS ranged from 9 to 32 +m. Depending on boronizing time and temperature, the hardness of boronized fine grain DSS is between 1014 HV to 2601 HV. The values are higher than that of the as-received DSS which is between 797 HV to 2311 HV. The result shows that there is a different in hardness of boride layer for two different grain sizes of DSS although the layer thickness formed is about the same in depth.

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

Effects of Superplasticity in Boronizing of Duplex Stainless Steel

2006 ◽  
Vol 326-328 ◽  
pp. 1233-1236 ◽  
Author(s):  
Rafidah Hasan ◽  
Iswadi Jauhari ◽  
Hiroyuki Ogiyama ◽  
Raden Dadan Ramdan
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Surface Hardness ◽  
Load Condition ◽  
Boride Layer ◽  
Coarse Grain ◽  
Superplastic Behavior ◽  
Compression Load ◽  
Fine Grain ◽  
Hardness Values

In this research, conventional boronizing process (CB) and a new method of boronizing process under compression load condition (LB) were conducted and compared in order to study the effect of superplasticity on boronized substrate. Both processes were conducted on duplex stainless steel (DSS) with two different microstructures; as-received DSS with coarse grain microstructure (CDSS); and thermo-mechanically treated DSS with fine grain microstructure (FDSS) which can show superplastic behavior at high temperatures. Both processes were conducted at duration of 6 hours and temperatures between 1123 and 1223 K. All of boronized specimens demonstrated thin, smooth and compact morphology of boride layer. For CDSS, both CB and LB processes produced about similar surface hardness values within the range of 1425 – 2330 HV. For FDSS, CB process produced surface hardness between 1522 and 2601 HV, while under LB, the highest surface hardness values in the range of 1659 - 2914 HV were obtained. The result shows that introduction of load during boronizing has initiated superplastic deformation on FDSS thus accelerated diffusion of boron atoms into surface which finally lead to significantly higher surface hardness.

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.

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