Colloid and Surface Science
Volume 2, Issue 4, December 2017, Pages: 125-129
Received: Jun. 19, 2017;
Accepted: Jul. 5, 2017;
Published: Aug. 18, 2017
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Faraj Ahmed Emhmmed Alhegagi, The Department of Mechanical Engineering, Faculty of Engineering, Ben Walid University, Ben Walid, Libya
Specimens of duplex stainless steels 50:50 ferrite –Austenite were heat treated at 475°C for different times and pulled to failure. Fracture toughness testing was performed according to BS 7448, clip gauge, to monitor specimen displacement. In addition, the direct current potential drop (DCPD) technique was used to monitor the crack propagation. The Crack Tip Open Displacement (CTOD) was evaluated. Computational data, Shear model, were fit to the experimental ones. Discrepancy was observed between the experimental data and the computational ones. The model was able to expect the crack tip open displacement (CTOD), experimental data, only within a certain range of the material hardness. In addition, the direct current potential drop technique was more sensitive to detect the crack propagation process than that observed for the clip gauge. This work aims to study the fracture mechanism during cracking of duplex stainless steels.
Faraj Ahmed Emhmmed Alhegagi,
Techniques Reliability in Chromium-Rich Stainless Steels Failure Assessment, Colloid and Surface Science.
Vol. 2, No. 4,
2017, pp. 125-129.
Copyright © 2017 Authors retain the copyright of this article.
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J. O. Nilsson, Super Duplex Stainless Steel, Materials Science and Technology, Vol. 8, August 1992, 685-700.
L. J. R. Cohen, J. A. Charles and G. C. Smith, Influence of Cathodic Hydrogen On microstructure of duplex stainless steels Duplex Stainless Steels `87, Conf. Proc., York, Sep. 1987, Pub. I. O. M, 1988, 363-374.
S. Bonnet, J. Bourgoin, J. Champredonde, D. Guttmann and M. Guttmann, Relationship Between Evaluation Of Mechanical Properties Of Various Cast Duplex Stainless Steels And Metallurgical And Aging Parameters: Outline of Current EDF Programes, Mater. Sci. Tech., Vol. 6, 1990, 221-229.
R. O. Ritchie and A. W. Thompson, On Macroscopic And Microscopic Analysis For Crack Initiation And Crack Growth Toughness In Ductile Alloys, Metallurgical Transacation, Vol. 16A, 1985, 233-248.
ASTME 1290, Standard Test Method For Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement, Annual Book Of ASTM Standard, 1989.
BS 7448, Fracture Mechanics Toughness Tests. Part 1. Method For Determination of KIC, Critical CTOD and Critical J Values of Metallic Materials, Annual Book Of BSI Standard, 1991.
D. A. Curry, Cleavage Micromechanisms of Crack Extension In Steels, Metals Sci., Vol. 14, 1980, 319-326.
R. O. Ritchie and J. F. Knott, On The Relationship Between Critical Tensile Stress And Fracture Toughness In Mild Steel, J. Mech. Phys. Solids, Vol. 21, 1973, 395-410.
T. J. Marrow, A. O. Humphreys and M. Strangwood, The Crack Initiation Toughness For Brittle Fracture Of Super Duplex Stainless Steel, Fatigue& Fracture of Engineering Materials & Structures, Vol. 20. No. 7, 1997, 1005-1014.
J. R. Rice and M. A. Johnson, The Role of Large Crack Tip Geometry in Plane Strain Fracture, In: Inelastic Behaviour of Solids, McGraw Hill, 1970, 641-672.
T. J. Marrow and C. Harris, The Fracture Mechanism of 475°C Embrittlement in A Duplex Stainless Steels, Fatigue& Fracture of Engineering Materials &Structures, Vol. 19, No. 7, 1996, PP 935-947.
Cem Örnek, Safwan A. M. Idris, Pierfranco Reccagni and Dirk L. Engelberg, "Atmospheric-Induced Stress Corrosion Cracking of Grade 2205 Duplex Stainless Steel—Effects of 475 ˝C Embrittlement and Process Orientation Metals", Metals, Vol. 6, 2016, P 167.