The Influence And Role Of Helium And Nitrogen As Shielding Gases In 2KW CO2 Laser Welding Of Austenitic Stainless Steels : Physical, Geometrical And Technological Characterization

1989 ◽  
Author(s):  
G. Daurelio ◽  
A. Ludovico ◽  
A. Saponaro
Keyword(s):  
Laser Welding ◽  
Co2 Laser ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Shielding Gases

Strain-induced martensite effects on transgranular carbide precipitation in type 304 stainless steels

1991 ◽  
Vol 49 ◽  
pp. 604-605
Author(s):  
A.H. Advani ◽  
L.E. Murr ◽  
D. Matlock
Keyword(s):  
Heat Treatment ◽  
Grain Boundary ◽  
Stress Corrosion Cracking ◽  
Stainless Steels ◽  
Deformation Twin ◽  
Austenitic Stainless Steels ◽  
Carbide Precipitation ◽  
Strain Induced Martensite ◽  
Type 304

Thermomechanically induced strain is a key variable producing accelerated carbide precipitation, sensitization and stress corrosion cracking in austenitic stainless steels (SS). Recent work has indicated that higher levels of strain (above 20%) also produce transgranular (TG) carbide precipitation and corrosion simultaneous with the grain boundary phenomenon in 316 SS. Transgranular precipitates were noted to form primarily on deformation twin-fault planes and their intersections in 316 SS.Briant has indicated that TG precipitation in 316 SS is significantly different from 304 SS due to the formation of strain-induced martensite on 304 SS, though an understanding of the role of martensite on the process has not been developed. This study is concerned with evaluating the effects of strain and strain-induced martensite on TG carbide precipitation in 304 SS. The study was performed on samples of a 0.051%C-304 SS deformed to 33% followed by heat treatment at 670°C for 1 h.

Real-Time Monitoring of Coaxial Protection Fiber Laser Welding of Austenitic Stainless Steels

2017 ◽  
Vol 44 (5) ◽  
pp. 0502003 ◽  
Author(s):  
任勇 Ren Yong ◽  
武强 Wu Qiang ◽  
邹江林 Zou Jianglin ◽  
陈乐 Chen Le ◽  
肖荣诗 Xiao Rongshi
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
Real Time ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Real Time Monitoring ◽  
Fiber Laser Welding

Role of Alloying Elements on the Cytotoxic Behavior and Corrosion of Austenitic Stainless Steels

2005 ◽  
pp. 2295-2298
Author(s):  
Y.S. Kim ◽  
Y.R. Yoo ◽  
C.G. Sohn ◽  
Keun Taek Oh ◽  
Kyoung Nam Kim ◽  
...  
Keyword(s):  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Alloying Elements

Zinc diffusion induced precipitation of σ-phase in austenitic stainless steel

2019 ◽  
Vol 116 (6) ◽  
pp. 618
Author(s):  
Nega Setargew ◽  
Daniel J. Parker
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Stainless Steels ◽  
Intermetallic Phase ◽  
Austenitic Stainless Steels ◽  
Austenite Matrix ◽  
Σ Phase ◽  
Intermediate Phases ◽  
Zinc Diffusion

Zinc diffusion-induced degradation of AISI 316LN austenitic stainless steel pot equipment used in 55%Al-Zn and Zn-Al-Mg coating metal baths is described. SEM/EDS analyses results showed that the diffused zinc reacts with nickel from the austenite matrix and results in the formation of Ni-Zn intermetallic compounds. The Ni-Zn intermetallic phase and the nickel depleted zones form a periodic and alternating layered structure and a mechanism for its formation is proposed. The role of cavities and interconnected porosity in zinc vapour diffusion-induced degradation and formation of Ni-Zn intermediate phases is also discussed. The formation of Ni-Zn intermediate phases and the depletion of nickel in the austenite matrix results in the precipitation of σ-phase and α-ferrite in the nickel depleted regions of the matrix. This reaction will lead to increased susceptibility to intergranular cracking and accelerated corrosion of immersed pot equipment in the coating bath. Zinc diffusion induced precipitation of σ-phase in austenitic stainless steels that we are reporting in this work is a new insight with important implications for the performance of austenitic stainless steels in zinc containing metal coating baths and other process industries. This new insight will further lead to improved understanding of the role of substitutional diffusion and the redistribution of alloying elements in the precipitation of σ-phase in austenitic stainless steels.

scholarly journals Role of residual ferrites on crevice SCC of austenitic stainless steels in PWR water with high-dissolved oxygen

2020 ◽  
Vol 52 (11) ◽  
pp. 2552-2564
Author(s):  
Abdullah Sinjlawi ◽  
Junjie Chen ◽  
Ho-Sub Kim ◽  
Hyeon Bae Lee ◽  
Changheui Jang ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Stainless Steels ◽  
Austenitic Stainless Steels

The role of nitrogen in the passivity of austenitic stainless steels

1994 ◽  
Vol 36 (11) ◽  
pp. 1825-1834 ◽  
Author(s):  
A Sadough Vanini ◽  
J.-P Audouard ◽  
P Marcus
Keyword(s):  
Stainless Steels ◽  
Austenitic Stainless Steels

A role of δ-ferrite in edge-crack formation during hot-rolling of austenitic stainless steels

1997 ◽  
Vol 37 (8) ◽  
pp. 1231-1235 ◽  
Author(s):  
F. Czerwinski ◽  
A. Brodtka ◽  
J.Y. Cho ◽  
A. Zielinska-Lipiec ◽  
J.H. Sunwoo ◽  
...  
Keyword(s):  
Stainless Steels ◽  
Hot Rolling ◽  
Edge Crack ◽  
Crack Formation ◽  
Austenitic Stainless Steels ◽  
Δ Ferrite
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