Turbine Housing Failure Due to Sigma Phase Precipitation and Embrittlement of Niobium-Stabilized Austenitic Steel Casting

2020 ◽  
Vol 29 (3) ◽  
pp. 1535-1543
Author(s):  
Artur Jaworski ◽  
Łukasz Krawczyk ◽  
Krzysztof Kubiak
Keyword(s):  
Austenitic Steel ◽  
Steel Casting ◽  
Sigma Phase ◽  
Phase Precipitation ◽  
Turbine Housing

scholarly journals Austenite-ferrite interface crystallography dependence of sigma phase precipitation using the five-parameter characterization approach

2017 ◽  
Vol 196 ◽  
pp. 264-268 ◽  
Author(s):  
N. Haghdadi ◽  
D. Abou-Ras ◽  
P. Cizek ◽  
P.D. Hodgson ◽  
A.D. Rollett ◽  
...  
Keyword(s):  
Sigma Phase ◽  
Phase Precipitation

Internal Friction Influenced by Hydrogen in Super Duplex Stainless Steels

2005 ◽  
Vol 502 ◽  
pp. 345-350
Author(s):  
Toshio Kuroda ◽  
Katsuyuki Nakade ◽  
Kenji Ikeuchi
Keyword(s):  
Internal Friction ◽  
Stainless Steels ◽  
Sigma Phase ◽  
Peak Height ◽  
Phase Precipitation ◽  
Internal Friction Peak ◽  
Hydrogen Charging ◽  
Super Duplex Stainless Steels ◽  
Two Peaks ◽  
Friction Analysis

The influence of microstructure concerning sigma phase on hydrogen behavior was investigated by means of internal friction analysis. After hydrogen charging, a sharp significant internal friction peak by hydrogen in austenite of as-received specimen was observed at 245K for a frequency of 1.5Hz. However, the peak height in the specimen precipitated significant sigma phase was substantially lower than in as-received specimen since hydrogen in austenite have a concentration lower by sigma phase precipitation. In addition, the broadening and scattering of the internal friction peak was clearly identified by interaction between hydrogen and sigma phase. It means that the two peaks associated with hydrogen in the both sigma phase and austenite were considered to be overlapped. Consequently, it was clearly confirmed that hydrogen entered in the sigma phase lattice and hydrogen was also trapped at sigma/austenite interfaces.

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