Three-dimensional studies of intergranular carbides in austenitic stainless steel

Microscopy ◽  
2016 ◽  
Author(s):  
Minoru Ochi ◽  
Rika Kawano ◽  
Takuya Maeda ◽  
Yukio Sato ◽  
Ryo Teranishi ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Three Dimensional

scholarly journals Development of Rolling Textures in an Austenitic Stainless Steel

1992 ◽  
Vol 19 (1-2) ◽  
pp. 101-121 ◽  
Author(s):  
C. D. Singh ◽  
V. Ramaswamy ◽  
C. Suryanarayana
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Shear Bands ◽  
Three Dimensional ◽  
Rolling Texture ◽  
Orientation Distribution ◽  
Distribution Functions ◽  
Texture Development ◽  
Slip Planes ◽  
Heterogeneous Deformation

Three dimensional texture analysis by means of orientation distribution functions (ODF) was used to examine the texture development during rolling at 473 K in an austenitic stainless steel. With the help of ODFs results, the different stages of texture development could be assigned to the existing theories of heterogeneous deformation mechanisms of low SFE face-centred cubic metals. The texture at very low degree of rolling consists of two limited orientation tubes with their fibre axes 〈110〉//ND and 〈110〉60∘ND and agrees with the predictions made by Taylor model. With further deformation, twinning causes the reduction of ≈{112}〈111〉 component and leads to the formation of twin {552}〈115〉. Abnormal slip on slip planes parallel to the twin boundaries rotates the twins into the {332}〈113〉 and {111}〈110〉 positions. The shear bands formation in the rotated twin-matrix lamellae changes their orientations near to {011}〈100〉 and {011}〈112〉 positions. Finally, normal slip again continues and sharpens the brass-type rolling texture.

Parametric FEM Evaluation of Residual Stress by Circumferential Welding for Austenitic Stainless Steel

2005 ◽  
Author(s):  
Jinya Katsuyama ◽  
Masahito Mochizuki ◽  
Ryota Higuchi ◽  
Masao Toyoda
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Stress Corrosion Cracking ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Welding Zone ◽  
Butt Welding ◽  
Plastic Analysis

Recently, stress corrosion cracking (SCC) of core internals and/or recirculation pipes of austenite stainless steel has been observed. SCC is considered to occur and progress near the welding zone because of the weld tensile residual stress. In the present work, thermo-elastic-plastic analysis of the residual stress was performed in order to clarify the effect of several parameters (diameter, thickness, number of multilayer welding) in the circumferential welding zone. Butt welding joint of SUS316L-pipes was examined. The residual stress was calculated by three dimensional-model and axisymmetric model and the results were compared and discussed in detail.

A Study of Effects of Pipe Geometry on FAD Curves for Austenitic Stainless Steel and Ferritic Steel Piping Materials

1998 ◽  
Vol 120 (1) ◽  
pp. 86-92 ◽  
Author(s):  
R. Mohan ◽  
G. M. Wilkowski ◽  
R. Bass ◽  
J. M. Bloom
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Wall Thickness ◽  
Ferritic Steel ◽  
Three Dimensional ◽  
Pipe Geometry ◽  
Element Method ◽  
Steel Piping

A comprehensive study of failure assessment diagrams for circumferentially surface-cracked austenitic stainless and ferritic steel pipes was conducted with the use of the finite element method (FEM). While the majority of the analyses were conducted using the line-spring/shell finite element method, some three-dimensional finite element analyses, conducted independently, are also reported in this paper. Comparison of the predictions of the line-spring/shell and three-dimensional analyses reinforce the validity of the former approach for surface-cracked pipes. The results indicated that the ASME Code Case N-494-2 applicable for ferritic steel piping appears reasonably conservative even for pipes with mean radius-to-wall thickness ratios of 20, whereas the results showed that the newly adopted Code Case N-494-3 for austenitic stainless steel piping requires a limit for pipe with mean radius-to-wall thickness ratios larger than 15. For consistency, the limitation of Rm/t ≤ 15 was incorporated in the approved final version of Code Case N-494-3, and was incorporated in Code Case N-494-2 as well. Because these Code cases are applicable only to Class 1 primary nuclear piping, which typically has values of Rm/t ≤ 15, this is not a significant limitation. It was also shown that the choice of definitions of membrane and bending stresses as well as the choice of F1 function values in calculating the elastic part of the J integral have a profound effect on the resulting FAD curves.

Analytical Study of the Relaxation of Welding Residual Stress by Excessive Loading for Austenitic Stainless Steel Piping Welds

2009 ◽  
Author(s):  
Jinya Katsuyama ◽  
Kunio Onizawa
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Nuclear Power ◽  
Power Plants ◽  
Three Dimensional ◽  
Welding Residual Stress ◽  
Low Carbon ◽  
Three Dimensional Model ◽  
Butt Weld

Welding residual stress is one of the most important factors of stress corrosion cracking (SCC) for austenitic stainless steel in pressure boundary piping in nuclear power plants. The effect of excessive loading, such as an earthquake, on the residual stress was evaluated by three-dimensional analyses based on finite element method (FEM). The FEM analyses were performed using three-dimensional model for a 250A piping butt weld of low carbon stainless steel of Type 316L. A welding simulation method used in this work is based on the moving heat source with the double ellipsoid model and was confirmed by comparing with the experimental measurements. After conducting welding residual stress simulation, several loading patterns of bending moment and uni-axial displacements have been applied to a model by varying amount of moment and displacement. The analyses indicated that higher loading to bending and axial stresses caused higher relaxation of welding residual stress near piping welds. The difference in the effect of loading direction was observed for both cases. It is concluded that the SCC growth rate might be decreased as loading level increased.

Two- and three-dimensional microstructural characterization of a super-austenitic stainless steel

2006 ◽  
Vol 418 (1-2) ◽  
pp. 11-18 ◽  
Author(s):  
A.C. Lewis ◽  
J.F. Bingert ◽  
D.J. Rowenhorst ◽  
A. Gupta ◽  
A.B. Geltmacher ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Three Dimensional ◽  
Microstructural Characterization ◽  
Super Austenitic Stainless Steel
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