Empirical corrosion fatigue life prediction models of a high strength steel

Murtaza, Ghulam; Akid, Robert

doi:10.1016/s0013-7944(00)00057-6

Cited by 49 publications

(20 citation statements)

References 8 publications

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“…Probably to a large extent, that critical balance is determined by the different deformation states of the points along the corroding surface. This question is even more pronounced when it comes to crack formation from surface pits, as observed in experiments and reported by Chen [84], Rokhlin [85], Pao [86], Murtaza and Akid [87] and Sankaran [88], among others. All these works show that mechanics is involved in the pit evolution to crack formation from the very first stages of the process.…”

Section: Multi-disciplinary View Of Stress Corrosion Crackingmentioning

confidence: 76%

Fundamental Understanding of Crack Growth in Structural Components of Generation IV Supercritical Light Water Reactors

Balachov¹,

Kobayashi²,

Tanzella³

et al. 2004

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REPORT DOCUMENTATION PAGEForm Approved OMB NO. Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment regarding this burden estimates or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and This work contributes to the design of safe and economical Generation-IV Super-Critical Water Reactors (SCWRs) by providing a basis for selecting structural materials to ensure the functionality of in-vessel components during the entire service life. During the second year of the project, we completed electrochemical characterization of the oxide film properties and investigation of crack initiation and propagation for candidate structural materials steels under supercritical conditions. We ranked candidate alloys against their susceptibility to environmentally assisted degradation based on the in situ data measured with an SRI-designed controlled distance electrochemistry (CDE) arrangement. A correlation between measurable oxide film properties and susceptibility of austenitic steels to environmentally assisted degradation was observed experimentally. One of the major practical results of the present work is the experimentally proven ability of the economical CDE technique to supply in situ data for ranking candidate structural materials for Generation-IV SCWRs. A potential use of the CDE arrangement developed at SRI for building in situ sensors for monitoring water chemistry in the heat transport circuit of Generation-IV SCWRs was evaluated and proved to be feasible. Understanding basic phenomena. Kinetic parameters of the charge and mass transport processes in the metal/oxide film/supercritical water system are derived from in situ oxide film studies to understand and quantify the rate-controlling processes and, eventually, the fundamentals of the metal oxidation phenomenon at supercritical temperatures. Providing a basis for the development of new alloys. Integration of the in situexperimental information on oxide film resistance to charge and mass transport for alloys of various compositions, along with fracture surface analysis and current theoretical understanding of the relationship between properties of the oxide films and stability of materials, is expected to aid in material selection and the development process. It will do so by providing recommendations for chemical compositions of the alloys in regard to their expected locations in the reactor (or more specifically, in regard to local temperature and oxidizing conditions). 1 WORK PERFORMED AND PRELIMINARY RESULTSDuring this project, SRI completed the electrochemical characterization of the oxide film prop...

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Section: Multi-disciplinary View Of Stress Corrosion Crackingmentioning

confidence: 76%

Fundamental Understanding of Crack Growth in Structural Components of Generation IV Supercritical Light Water Reactors

Balachov¹,

Kobayashi²,

Tanzella³

et al. 2004

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“…The addition of molybdenum to nickel alloys, such as C2000, is believed to preferentially locate to local defect sites within the oxide barrier, which decreases the propensity for anodic dissolution due to the molybdenumÕs ability to act as a strong bond former with surrounding neighbors. [13,14] Other theories suggest that the presence of MoO 4 2-acts as a repelling barrier for detrimental ions, such as OH-and Cl-. [13,15] Using SEM with EDS provides some idea as to chloride ions being transported along the fractured surface.…”

Section: Discussionmentioning

confidence: 99%

“…Fatigue behavior in adverse solutions, namely, 3 to 4 wt pct NaCl, was determined by Asphanani [1] for Ni-Cr with additions of molybdenum or other elements to determine the effects of a sodium-chloride solution on the fatigue-endurance limit. Although many articles have been published in the literature to study the effects of corrosive media on the fatigue behavior of conventional materials, such as stainless steels, [2][3][4][5][6] the research manifesting the fatigue behavior of nickel-based alloys is limited for the monitoring of corrosion-fatigue behavior. [1,7,8] Additionally, most corrosion-fatigue studies are performed on materials that have moderate-forming protective films, which causes these materials to be susceptible to localized corrosion at a critical potential, E p , above the natural potential of the material.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Electrochemical Investigations of a Nickel-Based Alloy Subjected to Fatigue

Steward

Wang

Buchanan

et al. 2007

Metall Mater Trans A

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The HASTELLOY C2000 superalloy is a commercially designed superalloy manufactured to function in reducing and oxidizing corrosive solutions. The industrial applications have tremendous potential in automotive, structural, aviation, and storage components. Although C2000 demonstrates good reducing and oxidizing traits in extremely aggressive media (which are attractive features of its chemistry), changes in the mechanical properties are believed to be insignificant due to its strong propensity to passivate under corrosive conditions. The ductility behavior and corrosion properties of C2000 are superior to those of stainless steels. The objective of the present study is to examine the corrosion-fatigue behavior of C2000 in a 3.5 wt pct sodium-chloride (NaCl) solution. C2000 submerged in 3.5 wt pct NaCl at room temperature is not susceptible to localized corrosion, such as pitting, during fatigue. At an accelerated potential of 350 mV, the current responses show an increase in the current due to slip steps emerging to the surface as a result of fatigue. The crack-initiation site and the examination of the fracture morphology are discussed.

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“…The fatigue behaviour of cold drawn eutectoid steel, frequently used as reinforcement in prestressed concrete, had received attention in the past, both in air [1] and in aggressive environments [2][3][4][5][6]. NaCl corrosion-fatigue affects the fatigue performance of high strength steel by increasing the crack growth rate in relation to its value in inert environment [3,4], this effect being even higher if the environment is constituted by Ca(OH) 2 +NaCl [5].…”

Section: Abstract: Numerical Modelling Fatigue Crack Propagation Prmentioning

confidence: 99%

“…NaCl corrosion-fatigue affects the fatigue performance of high strength steel by increasing the crack growth rate in relation to its value in inert environment [3,4], this effect being even higher if the environment is constituted by Ca(OH) 2 +NaCl [5].…”

Section: Abstract: Numerical Modelling Fatigue Crack Propagation Prmentioning

confidence: 99%

Environmentally-assisted fatigue crack growth in prestressing steel wires

et al. 2012

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This paper presents the evolution of the surface crack front in prestressing reinforced concrete steel wires subjected to fatigue in air and to corrosion-fatigue in Ca(OH) 2 +NaCl. To this end, a numerical modelling was made on the basis of a discretization of the crack front (with elliptical shape), considering that the crack advance at each point is perpendicular to such a front according to a Paris-Erdogan law, and using a threeparameter solution for stress intensity factor (SIF). Each analyzed case (a particular initial crack geometry) was characterized by the evolution of the semielliptical crack aspect ratio (relation between the semiaxes of the ellipse) with the relative crack depth and by the variation of the maximum dimensionless SIF at the crack front. Keywords: numerical modelling, fatigue crack propagation, prestressing steel bars, Ca(OH) 2 +NaCl corrosion-fatigue.The fatigue behaviour of cold drawn eutectoid steel, frequently used as reinforcement in prestressed concrete, had received attention in the past, both in air [1] and in aggressive environments [2][3][4][5][6]. NaCl corrosion-fatigue affects the fatigue performance of high strength steel by increasing the crack growth rate in relation to its value in inert environment [3,4], this effect being even higher if the environment is constituted by Ca(OH) 2 +NaCl [5].When cylindrical rods (bars, wires, shafts…) are used, transverse cracking by fatigue usually takes place in the form of surface cracks with a semielliptical shape [7]. Growth of surface cracks in round bars due to fatigue can be modelled using different criteria, e.g., prediction of the 90° intersecting angle of the crack with the surface or the iso-K criterion along the crack front [8]. Another criterion is based on the crack growth according to the Paris-Erdogan law [9], considering the crack advance perpendicular to the crack front, assuming elliptic geometry for the growing crack [10,11] or avoiding the shape hypothesis, i.e., allowing the crack to grow with any shape [12].Material. This paper studies the corrosion-fatigue crack propagation in prestressing steel wires (chemical composition: 0.82% C; 0.60% Mn; 0.18% Si; 0.010% P and 0.024% S) of 7 mm diameter. Mechanical properties of the steel were obtained by Singh and Sánchez-Gálvez . Fatigue tests were performed [5] under 1 Hz sinusoidal wave and R-ratio equal to 0.5 in both air and aggressive environment consisting of 1 g/l Ca(OH) 2 + 1 g/l NaCl solution at free corrosion potential, and results were fitted to a Paris-Erdogan law [9] in the form:obtaining the coefficients of the Paris law for prestressing steel in both environments.

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Empirical corrosion fatigue life prediction models of a high strength steel

Cited by 49 publications

References 8 publications

Fundamental Understanding of Crack Growth in Structural Components of Generation IV Supercritical Light Water Reactors

Fundamental Understanding of Crack Growth in Structural Components of Generation IV Supercritical Light Water Reactors

In-Situ Electrochemical Investigations of a Nickel-Based Alloy Subjected to Fatigue

Environmentally-assisted fatigue crack growth in prestressing steel wires

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