Kinetics of carburizing of duplex stainless steel (DSS) by superplastic compression at different strain rates

2010 ◽  
Vol 527 (16-17) ◽  
pp. 4257-4261 ◽  
Author(s):  
Nor Wahida Ahamad ◽  
Iswadi Jauhari ◽  
Sharidah Azuar Abdul Azis ◽  
Nur Hafizah Abd Aziz
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Strain Rates ◽  
Kinetics Of

Kinetics of Cr/Mo-rich precipitates formation for 25Cr-6.9Ni-3.8Mo-0.3N super duplex stainless steel

2012 ◽  
Vol 18 (2) ◽  
pp. 201-207 ◽  
Author(s):  
Sang-Ho Byun ◽  
Namhyun Kang ◽  
Tae-Ho Lee ◽  
Sang-Kon Ahn ◽  
Hae Woo Lee ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Super Duplex Stainless Steel ◽  
Kinetics Of

A Study on Properties and Kinetics of Carburizing Superplastic Duplex Stainless Steel

2006 ◽  
Vol 326-328 ◽  
pp. 1677-1680 ◽  
Author(s):  
Nik Rozlin Nik Masdek ◽  
Iswadi Jauhari ◽  
Raden Dadan Ramdan ◽  
Rafidah Hasan
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Carbon Diffusion ◽  
Carbon Layer ◽  
Case Depth ◽  
Hard Carbon ◽  
Metallographic Technique ◽  
New Type ◽  
Kinetics Of ◽  
Carburizing Process

In this study, a new type of surface carburizing process was introduced using superplastic duplex stainless steel (DSS). The superplastic DSS was carburized at temperatures ranging from 1123 K to 1223 K for various durations. Initial pressures of 25 MPa, 49 MPa and 74 MPa were applied to give the superplastic deformation effect on the carburized specimens. SEM studies revealed a thick, uniform, smooth and dense hard carbon layer was formed on the surface of the superplastic DSS. By using metallographic technique and SEM, the resulting case depth of carbon layer was between 15 /m to 76 /m. The kinetics of this process in terms of carbon diffusion and its variation with processing time and temperature was determined using Arrhenius equation. Activation energy (Q) was determined as 152 kJ/mol.

Influence of Strain Rate and Strain on the Surface Properties in Superplastically Boronized Duplex Stainless Steel (DSS)

2009 ◽  
Vol 283-286 ◽  
pp. 458-463 ◽  
Author(s):  
N.H. Abd Aziz ◽  
Iswadi Jauhari ◽  
H.A. Mohd Yusof ◽  
Nor Wahida Ahamad
Keyword(s):  
Stainless Steel ◽  
Strain Rate ◽  
Duplex Stainless Steel ◽  
High Strain ◽  
Grain Boundary Sliding ◽  
Strain Rate Range ◽  
Strain Rates ◽  
Compression Strain ◽  
Short Period ◽  
Boundary Sliding

It was reported that superplastic boronizing process (SPB) provides a much faster boronizing rate than the conventional boronizing process (CB). This process was conducted on duplex stainless steel (DSS) which exhibit superplasticity. The study concentrated on the effect of strain rate and compression strain on SPB. The process was conducted under four different strain rates and three diferent strains condition. Boronizing was successfully conducted with the best result obtained under the high strain rate range of 5 x 10-5 s-1 to 1 x 10-3 s-1 which is associated with the superplastic region. Through SPB, movement of atoms into the specimen was highly accelerated by the grain boundary sliding process leading to a formation of thick and hard boronized layer in extraordinarily short period of time.

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