Fracture Mechanics Analysis of Cast Duplex Stainless Steel Elbows Containing a Surface Crack

2009 ◽  
pp. 159-159-13
Author(s):  
PA Le Delliou ◽  
P Sémété ◽  
S Ignaccolo
Keyword(s):  
Stainless Steel ◽  
Fracture Mechanics ◽  
Duplex Stainless Steel ◽  
Surface Crack ◽  
Mechanics Analysis

Surface Crack and Organization of Hot Rolled S31803 Duplex Stainless Steel Bars

2014 ◽  
Vol 670-671 ◽  
pp. 41-45
Author(s):  
Ming Hua Wu ◽  
Zhan Ying Liu ◽  
Hui Yang
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Surface Crack ◽  
Heating Temperature ◽  
Bar Rolling ◽  
Softening Mechanism ◽  
Double Phase ◽  
Steel Bar ◽  
Hot Rolled ◽  
Steel Heat

In bar rolling of S31803 duplex stainless steel, the surface crack is easy to appear. Through the observation on the microstructure, ferrite and austenite morphology and phase ratio were analyzed. The surface cracks of S31803 duplex stainless steel bar is mainly because of the dual phase microstructure softening mechanism of different in thermal processing, and the double phase stainless steel heat plasticity decrease. When the ferrite and austenite proportion close, and the heating temperature is too high, to reduce the binding force between the grains of billet surface, easy to cause the crack surface of a bar.

Analysis of HAZ Fracture Toughness of Duplex Stainless Steel Weldment

2009 ◽  
Author(s):  
C. S. Pathak ◽  
L. G. Navale ◽  
A. D. Sahasrabudhe ◽  
M. J. Rathod
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Fracture Mechanics ◽  
Residual Stresses ◽  
Duplex Stainless Steel ◽  
Fracture Behavior ◽  
Health And Safety ◽  
Steel Weldment ◽  
Welded Structure ◽  
Stainless Steel Weldment

Most of the serious weldment failures lead to catastrophic consequences in terms of damage to other equipment, loss of production, and risks to workers’ health and safety. Hence there is motivation to find margin between safety and disaster. This necessitates guaranteeing the integrity of a welded structure even if a crack is present. Therefore influence of the material inhomogenity and residual stresses on deformation and fracture behavior needs to be described precisely. A comparison of the applied load with a convenient material parameter is necessary for this purpose. Fracture mechanics parameters J integral & CTOD have attracted great interest in recent years. In case of base materials, fracture mechanics works quite well, but some specific problems occur if fracture mechanics principles are applied when examining the toughness properties of welded joints. These problems are mainly caused by the large difference in material properties and residual stresses. Existing fracture toughness testing can predict fracture behavior, but does not sufficiently address the problem associated with weldment testing. Three SENB duplex stainless steel weldment specimens were tested as per ASTM E1820. This standard is not recommended for weldment, but since no standard is available for testing duplex stainless steel weldment, authors preferred to use it as reference. The aim of this work is to explore the possibility of using the test results in the reliable prediction of weldment fracture and its correlation with microstructure and hardness.

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