Effect of nitrogen on the electron structure and stacking fault energy in austenitic steels

2006 ◽  
Vol 55 (6) ◽  
pp. 537-540 ◽  
Author(s):  
V. Gavriljuk ◽  
Yu. Petrov ◽  
B. Shanina
Keyword(s):  
Stacking Fault ◽  
Electron Structure ◽  
Stacking Fault Energy ◽  
Austenitic Steels

scholarly journals Stacking Fault Energy in Relation to Hydrogen Environment Embrittlement of Metastable Austenitic Stainless CrNi-Steels

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1170
Author(s):  
Robert Fussik ◽  
Gero Egels ◽  
Werner Theisen ◽  
Sebastian Weber
Keyword(s):  
Phase Transformation ◽  
Intermediate Stage ◽  
Tensile Tests ◽  
Stacking Fault ◽  
Hydrogen Gas ◽  
Stacking Fault Energy ◽  
Austenitic Steels ◽  
Aisi 304L ◽  
Hydrogen Environment ◽  
Gas Atmosphere

Metastable austenitic steels react to plastic deformation with a thermally and/or mechanically induced martensitic phase transformation. The martensitic transformation to α’-martensite can take place directly or indirectly via the intermediate stage of ε-martensite from the single-phase austenite. This effect is influenced by the stacking fault energy (SFE) of austenitic steels. An SFE < 20 mJ/m2 is known to promote indirect conversion, while an SFE > 20 mJ/m2 promotes the direct conversion of austenite into α’-martensite. This relationship has thus far not been considered in relation to the hydrogen environment embrittlement (HEE) of metastable austenitic CrNi steels. To gain new insights into HEE under consideration of the SFE and martensite formation of metastable CrNi steels, tensile tests were carried out in this study at room temperature in an air environment and in a hydrogen gas atmosphere with a pressure of p = 10 MPa. These tests were conducted on a conventionally produced alloy AISI 304L and a laboratory-scale modification of this alloy. In terms of metal physics, the steels under consideration differed in the value of the experimentally determined SFE. The SFE of the AISI 304L was 22.7 ± 0.8 mJ/m2 and the SFE of the 304 mod alloy was 18.7 ± 0.4 mJ/m2. The tensile specimens tested in air revealed a direct γàα’ conversion for AISI 304L and an indirect γàεàα’ conversion for 304mod. From the results it could be deduced that the indirect phase transformation is responsible for a significant increase in the content of deformation-induced α’-martensite due to a reduction of the SFE value below 20 mJ/m2 in hydrogen gas atmosphere.

Effect of Substitutional Alloying Elements on the Stacking Fault Energy in Austenitic Steels

2021 ◽  
Vol 2021 (10) ◽  
pp. 1325-1332
Author(s):  
V. M. Blinov ◽  
I. O. Bannykh ◽  
E. I. Lukin ◽  
O. A. Bannykh ◽  
E. V. Blinov ◽  
...  
Keyword(s):  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Austenitic Steels ◽  
Alloying Elements

Correlation between stacking fault energy and deformation microstructure in high-interstitial-alloyed austenitic steels

2010 ◽  
Vol 58 (8) ◽  
pp. 3173-3186 ◽  
Author(s):  
Tae-Ho Lee ◽  
Eunjoo Shin ◽  
Chang-Seok Oh ◽  
Heon-Young Ha ◽  
Sung-Joon Kim
Keyword(s):  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Austenitic Steels ◽  
Deformation Microstructure

Stacking fault energy of cryogenic austenitic steels

2002 ◽  
Vol 11 (6) ◽  
pp. 596-600 ◽  
Author(s):  
Dai Qi-Xun ◽  
Wang An-Dong, Cheng Xiao-Nong ◽  
Luo Xin-Min
Keyword(s):  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Austenitic Steels

Thermodynamic modeling of the stacking fault energy of austenitic steels

2011 ◽  
Vol 59 (3) ◽  
pp. 1068-1076 ◽  
Author(s):  
S. Curtze ◽  
V.-T. Kuokkala ◽  
A. Oikari ◽  
J. Talonen ◽  
H. Hänninen
Keyword(s):  
Thermodynamic Modeling ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Austenitic Steels

scholarly journals Hot Wear of Single Phase fcc Materials—Influence of Temperature, Alloy Composition and Stacking Fault Energy

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2062
Author(s):  
Aaron Berger ◽  
Maximilian Walter ◽  
Santiago Manuel Benito ◽  
Sebastian Weber
Keyword(s):  
Single Phase ◽  
Elevated Temperatures ◽  
Electron Backscatter Diffraction ◽  
Wear Behavior ◽  
Industrial Applications ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Austenitic Steels ◽  
Microstructural Parameters ◽  
Fcc Materials

The severe sliding abrasion of single-phase metallic materials is a complex issue with a gaining importance in industrial applications. Different materials with different lattice structures react distinctly to stresses, as the material reaction to wear of counter and base body is mainly determined by the deformation behavior of the base body. For this reason, fcc materials in particular are investigated in this work because, as shown in previous studies, they exhibit better hot wear behavior than bcc materials. In particular, three austenitic steels are investigated, with pure Ni as well as Ni20Cr also being studied as benchmark materials. This allows correlations to be worked out between the hot wear of the material and their microstructural parameters. For this reason, wear tests are carried out, which are analyzed on the basis of the wear characteristics and scratch marks using Electron Backscatter Diffraction. X-ray experiments at elevated temperatures were also carried out to determine the microstructural parameters. It was found that the stacking fault energy, which influences the strain hardening potential, governs the hot wear behavior at elevated temperatures. These correlations can be underlined by analysis of the wear affected cross section, where the investigated materials have shown clear differences.

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