The Experts below are selected from a list of 17181 Experts worldwide ranked by ideXlab platform
Hans J. Leber - One of the best experts on this subject based on the ideXlab platform.
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Corrosion Fatigue initiation and short crack growth behaviour of austenitic stainless steels under light water reactor conditions
Corrosion Science, 2012Co-Authors: H P Seifert, Stefan Ritter, Hans J. LeberAbstract:Abstract The Corrosion Fatigue initiation and short crack growth behaviour of different wrought low-carbon and stabilised austenitic stainless steels was characterised under simulated boiling water reactor and pressurised water reactor primary water conditions by cyclic Fatigue tests with sharply notched fracture mechanics specimens. The special emphasis was placed to the behaviour at low Corrosion potentials and, in particular, to hydrogen water chemistry conditions. The major parameter effects and critical conjoint threshold conditions, which result in relevant environmental reduction and acceleration of Fatigue initiation life and subsequent short crack growth, respectively, are discussed and summarised. The observed Corrosion Fatigue behaviour is compared with the Fatigue evaluation procedures in codes and regulatory guidelines.
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Corrosion Fatigue crack growth behaviour of austenitic stainless steels under light water reactor conditions
Corrosion Science, 2012Co-Authors: H P Seifert, Stefan Ritter, Hans J. LeberAbstract:Abstract The Corrosion Fatigue crack growth behaviour of different wrought low-carbon and stabilised austenitic stainless steels was characterised under simulated boiling water and primary pressurised water reactor conditions by cyclic Fatigue tests with pre-cracked fracture mechanics specimens in the temperature range from 70 to 320 °C. The major parameter effects and critical conjoint threshold conditions, which result in relevant environmental acceleration of Fatigue crack growth are discussed and summarised. Furthermore, the observed Corrosion Fatigue behaviour is compared with the corresponding (Corrosion) Fatigue curves in the ASME and JSME boiler and pressure vessel code or open literature and conclusions with regard to their adequacy and conservatism are given.
H P Seifert - One of the best experts on this subject based on the ideXlab platform.
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Corrosion Fatigue initiation and short crack growth behaviour of austenitic stainless steels under light water reactor conditions
Corrosion Science, 2012Co-Authors: H P Seifert, Stefan Ritter, Hans J. LeberAbstract:Abstract The Corrosion Fatigue initiation and short crack growth behaviour of different wrought low-carbon and stabilised austenitic stainless steels was characterised under simulated boiling water reactor and pressurised water reactor primary water conditions by cyclic Fatigue tests with sharply notched fracture mechanics specimens. The special emphasis was placed to the behaviour at low Corrosion potentials and, in particular, to hydrogen water chemistry conditions. The major parameter effects and critical conjoint threshold conditions, which result in relevant environmental reduction and acceleration of Fatigue initiation life and subsequent short crack growth, respectively, are discussed and summarised. The observed Corrosion Fatigue behaviour is compared with the Fatigue evaluation procedures in codes and regulatory guidelines.
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Corrosion Fatigue crack growth behaviour of austenitic stainless steels under light water reactor conditions
Corrosion Science, 2012Co-Authors: H P Seifert, Stefan Ritter, Hans J. LeberAbstract:Abstract The Corrosion Fatigue crack growth behaviour of different wrought low-carbon and stabilised austenitic stainless steels was characterised under simulated boiling water and primary pressurised water reactor conditions by cyclic Fatigue tests with pre-cracked fracture mechanics specimens in the temperature range from 70 to 320 °C. The major parameter effects and critical conjoint threshold conditions, which result in relevant environmental acceleration of Fatigue crack growth are discussed and summarised. Furthermore, the observed Corrosion Fatigue behaviour is compared with the corresponding (Corrosion) Fatigue curves in the ASME and JSME boiler and pressure vessel code or open literature and conclusions with regard to their adequacy and conservatism are given.
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Evaluation of the mitigation effect of hydrogen water chemistry in BWRs on the low-frequency Corrosion Fatigue crack growth in low-alloy steels
Journal of Nuclear Materials, 2007Co-Authors: Stefan Ritter, H P SeifertAbstract:Abstract The mitigation effect of hydrogen water chemistry (HWC) on the low-frequency Corrosion Fatigue crack growth behaviour of low-alloy steels was investigated under those critical boiling water reactor (BWR) system conditions, where fast Corrosion Fatigue crack growth significantly above the ASME XI ‘wet’ reference Fatigue crack growth curves was observed under normal water chemistry conditions (NWC). The experiments were performed under simulated BWR conditions at temperatures of 250, 274 or 288 °C. Modern high-temperature water loops, on-line crack growth monitoring (DCPD) and fractographical analysis by scanning electron microscope were used to quantify the cracking response. HWC resulted in a significant drop of low-frequency Corrosion Fatigue crack growth rates by at least one order of magnitude with respect to NWC conditions and is therefore a promising and powerful mitigation method.
Yong Wang - One of the best experts on this subject based on the ideXlab platform.
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effects of thermally sprayed aluminum coating on the Corrosion Fatigue behavior of x80 steel in 3 5 wt nacl
Journal of Thermal Spray Technology, 2015Co-Authors: Weimin Zhao, Timing Zhang, Ruofei Xin, Manman Wang, Jianbo Sun, Yong WangAbstract:Corrosion Fatigue and Fatigue crack propagation experiments were conducted using X80 steel (with and without aluminum coating) in 3.5 wt.% NaCl solution. Results show that the aluminum coating could significantly improve the Corrosion Fatigue life of the steel substrate, and that this influence would be enhanced by decreasing the applied stress. However, the crack growth rate of the aluminum-coated X80 steel was slightly higher than that of bare X80 steel. Therefore, the presence of aluminum coating extends the crack initiation stage, and the inhibiting effect of aluminum coating on crack initiation outweighs its promotion of crack propagation. The acting mechanisms of the aluminum coating on crack initiation and propagation were discussed.
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contribution of anodic dissolution to the Corrosion Fatigue crack propagation of x80 steel in 3 5 wt nacl solution
Corrosion Science, 2012Co-Authors: Weimin Zhao, Ruofei Xin, Yong WangAbstract:Abstract The relation curves between the current density increment and the strain at crack tip of X80 steel in 3.5% NaCl under different strain rates were obtained. A formula that expresses the relationship between crack propagation rate caused by anodic dissolution, (d a /d N ) AD , and strain rate was established. The corresponding (d a /d N ) AD under different Δ K were calculated using the Corrosion Fatigue test results and the formula for calculating the strain rate at crack tip. A difference of three orders of magnitude between (d a /d N ) AD and the total d a /d N was observed. Anodic dissolution was not the main cause of Corrosion Fatigue crack propagation of X80 steel in 3.5% NaCl.
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study on the mechanism of high cycle Corrosion Fatigue crack initiation in x80 steel
Corrosion Science, 2012Co-Authors: Weimin Zhao, Yongxing Wang, Timing Zhang, Yong WangAbstract:Abstract Corrosion Fatigue experiments on X80 steel in 3.5% NaCl solution were conducted on a researcher-developed cantilever-bending Corrosion Fatigue testing machine. The morphology of Corrosion pits and the change in the surrounding microstructure were carefully examined using SEM and TEM, and the stress field was simulated using the finite-element method. The results show that the Corrosion Fatigue crack initiation is due to not only the Corrosion pits’ stress concentration effects but also the adhering Corrosion products. Corrosion products formed on the surface of slip bands, and the action of Corrosion products on Fatigue crack initiation was explained using physical models.
Ryuichiro Ebara - One of the best experts on this subject based on the ideXlab platform.
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Corrosion Fatigue BEHAVIOR OF SHIP HULL STRUCTURAL STEELS
2016Co-Authors: Ryuichiro EbaraAbstract:This paper seeks to describe on Corrosion Fatigue behavior of ship hull structural steels mainly based upon the author's recent experimental results. First it is described on general view of Corrosion Fatigue strength and Corrosion Fatigue crack propagation behavior of high strength steels. Then it is presented on Corrosion Fatigue strength of ship hull structural steel in ballast tank environment. It is demonstrated that tar epoxy resin coating effect on Corrosion Fatigue strength of KA32(TMCP) steel is observed in lower nominal stress range. Corrosion Fatigue crack propagation behavior of ship hull structural steels in cargo oil environment is also presented. Fatigue crack propagation rate for KA36(TMCP) and KAS steel is accelerated in the region where ⊿K is above about 16MPa m1/2 in the sour crude oil containing 400ppm H2S. A couple of future problems on Corrosion Fatigue research of ship hull structural steels are also touched in brief
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Corrosion Fatigue crack initiation behavior of stainless steels
Procedia Engineering, 2010Co-Authors: Ryuichiro EbaraAbstract:Abstract Corrosion Fatigue crack initiation behavior of various kinds of stainless steels is reviewed mainly on the basis of the author’s experimental results. The role of Corrosion pit in the Corrosion Fatigue crack initiation process of martensitic, ferritic, austenitic, duplex and precipitation-hardening stainless steels is briefly summarized. The recent investigation of an electrochemical noise measurement method is demonstrated for 12%Cr martensitic stainless steel and 2.5%Mo containing high strength austenitic stainless steels. Finally a couple of future problems to be solved in Corrosion Fatigue crack initiation are touched on briefly.
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Corrosion Fatigue crack initiation in 12 chromium stainless steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007Co-Authors: Ryuichiro EbaraAbstract:Characteristics of Corrosion Fatigue failures of steam turbine blades derived from failure analysis are summarized. Then Corrosion Fatigue variables on Corrosion Fatigue strength of 12% chromium stainless steel are briefly reviewed. The paper emphasizes initiation and growth of Corrosion pits in the Corrosion Fatigue crack initiation process. A recent investigation of the early stages of Corrosion pit initiation by use of electrochemical noise measurement is demonstrated. Finally, some recommendations are given how to clarify the Corrosion Fatigue crack initiation process.
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Corrosion Fatigue strength of ship structural steel plates in sour crude oil
Journal of the Society of Naval Architects of Japan, 1993Co-Authors: Ryuichiro Ebara, Yoshikazu Yamada, Akira Fushimi, Daisuke Sakai, Eiichi Watanabe, Hiroshi YajimaAbstract:There have been no tests carried out on the Fatigue strength of ship's hull structural members in large oil tankers because of the difficulty of conducting tests in the crude oil which contains H2S gas which is toxic to the human body. The authors manufactured sour crude oil Corrosion Fatigue testing apparatus for trials and then conducted Corrosion Fatigue crack propagation tests and Corrosion Fatigue life tests for KA 36 (TMCP) and KAS steel in sour crude oil containing 400 ppm of H2S gas. Consequently, it was found that Corrosion Fatigue cracks propagated on cleavage facets associated with brittle striation and Corrosion Fatigue crack propagation rages for the KA 36 (TMCP) and KAS steel are accelerated in the region where K is relatively large in sour crude oil containing 400 ppm of H2S. The Corrosion Fatigue crack propagation mechanism is also discussed for these steels in a sour crude oil environment.
Stefan Ritter - One of the best experts on this subject based on the ideXlab platform.
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Corrosion Fatigue initiation and short crack growth behaviour of austenitic stainless steels under light water reactor conditions
Corrosion Science, 2012Co-Authors: H P Seifert, Stefan Ritter, Hans J. LeberAbstract:Abstract The Corrosion Fatigue initiation and short crack growth behaviour of different wrought low-carbon and stabilised austenitic stainless steels was characterised under simulated boiling water reactor and pressurised water reactor primary water conditions by cyclic Fatigue tests with sharply notched fracture mechanics specimens. The special emphasis was placed to the behaviour at low Corrosion potentials and, in particular, to hydrogen water chemistry conditions. The major parameter effects and critical conjoint threshold conditions, which result in relevant environmental reduction and acceleration of Fatigue initiation life and subsequent short crack growth, respectively, are discussed and summarised. The observed Corrosion Fatigue behaviour is compared with the Fatigue evaluation procedures in codes and regulatory guidelines.
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Corrosion Fatigue crack growth behaviour of austenitic stainless steels under light water reactor conditions
Corrosion Science, 2012Co-Authors: H P Seifert, Stefan Ritter, Hans J. LeberAbstract:Abstract The Corrosion Fatigue crack growth behaviour of different wrought low-carbon and stabilised austenitic stainless steels was characterised under simulated boiling water and primary pressurised water reactor conditions by cyclic Fatigue tests with pre-cracked fracture mechanics specimens in the temperature range from 70 to 320 °C. The major parameter effects and critical conjoint threshold conditions, which result in relevant environmental acceleration of Fatigue crack growth are discussed and summarised. Furthermore, the observed Corrosion Fatigue behaviour is compared with the corresponding (Corrosion) Fatigue curves in the ASME and JSME boiler and pressure vessel code or open literature and conclusions with regard to their adequacy and conservatism are given.
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Evaluation of the mitigation effect of hydrogen water chemistry in BWRs on the low-frequency Corrosion Fatigue crack growth in low-alloy steels
Journal of Nuclear Materials, 2007Co-Authors: Stefan Ritter, H P SeifertAbstract:Abstract The mitigation effect of hydrogen water chemistry (HWC) on the low-frequency Corrosion Fatigue crack growth behaviour of low-alloy steels was investigated under those critical boiling water reactor (BWR) system conditions, where fast Corrosion Fatigue crack growth significantly above the ASME XI ‘wet’ reference Fatigue crack growth curves was observed under normal water chemistry conditions (NWC). The experiments were performed under simulated BWR conditions at temperatures of 250, 274 or 288 °C. Modern high-temperature water loops, on-line crack growth monitoring (DCPD) and fractographical analysis by scanning electron microscope were used to quantify the cracking response. HWC resulted in a significant drop of low-frequency Corrosion Fatigue crack growth rates by at least one order of magnitude with respect to NWC conditions and is therefore a promising and powerful mitigation method.
