The effect of acetic acid on the stress corrosion cracking of 3.5NiCrMoV turbine steels in high temperature water

Maeng, Wan Young; Macdonald, Digby D.

doi:10.1016/j.corsci.2008.04.023

Cited by 33 publications

(12 citation statements)

References 20 publications

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“…Steels for rotor construction are usually low-alloyed ones: they also have good fracture toughness and static and dynamic resistances, but lower than those of CRR steels. In [7] the structural analysis and the experimentation of a flywheel connected to a turbogenerator are reported, while many details on rotor design, manufacturing and testing are contained in [8][9][10][11][12]. The most used steel is 26 NiCrMoV 14 5 (3.5NiCrMoV or ASTM A470), satisfying all the aforementioned requirements.…”

Section: Introductionmentioning

confidence: 99%

LCF on turbogenerator rotors and coil retaining rings: material characterization and sensitivity analyses

Olmi

Freddi

2010

EPJ Web of Conferences

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Abstract. Turbogenerator rotors and coil retaining rings (CRRs) are highly loaded components typically subjected to LCF at any machine switch-on and switch-off. The present study aims at LCF characterization of two widely applied steels, 26 NiCrMoV 14 5 (for rotor manufacturing) and 18Mn18Cr (for CRR). Material anisotropy is also considered by performing an extended experimental campaign on specimens machined along different (tangential and radial) directions from trial components. The experimental tests, carried out with the use of a novel testing-constraining device for misalignment auto-compensation and with an original methodology for strain controlling, led to the determination of static, cyclic and fatigue curves for all the investigated cases. The research was completed by sensitivity analyses on the adopted models, thus determining fatigue curve tolerance bands, and by a statistical Analysis of Variance to compare the LCF performance of the different materials along the two considered machining directions. Results showed a significantly better performance of 18Mn18Cr and a weak anisotropy effect, remarkable just at the highest strain values, on a reduced portion of the LCF life range.

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Section: Introductionmentioning

confidence: 99%

LCF on turbogenerator rotors and coil retaining rings: material characterization and sensitivity analyses

Olmi

Freddi

2010

EPJ Web of Conferences

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“…The specimen geometry is shown in Fig. 4: it is a uniform gage test section specimen made in ASTM A470, a steel with several applications in the field of turbogenerators, for rotor and flywheel manufacturing 21–25 . This specimen is part of a larger set of specimens, used in an extensive experimental campaign for turbogenerator steel characterization.…”

Section: Methodsmentioning

confidence: 99%

“…The maximum value for the applied load was chosen in order to avoid specimen plasticization during the experiment, with a reasonable safety coefficient, according to the yield limit of 675 MPa indicated in literature, for example in Ref. 21 . At each load step, the voltage outputs Δ e 1 and Δ e 2 of the two Wheatstone bridges were recorded by a suitable acquisition device (P3 Strain Indicator, Vishay, Wendell, NC).…”

Section: Methodsmentioning

confidence: 99%

“…4: it is a uniform gage test section specimen made in ASTM A470, a steel with several applications in the field of turbogenerators, for rotor and flywheel manufacturing. [21][22][23][24][25] This specimen is part of a larger set of specimens, used in an extensive experimental campaign for turbogenerator steel characterization. All the specimens were derived from a portion of a forged rotor, previously subjected to the technological processes of ingot melting with vacuum oxygen decarburization, two-step forging process, 840 • C austenitization, salt bath quench, and 600 • C temper.…”

Section: Methodsmentioning

confidence: 99%

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A New Loading-Constraining Device for Mechanical Testing With Misalignment Auto-Compensation

Olmi

2010

Experimental Techniques

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ABSTRACT. Experimental testing represents the basic approach for mechanical characterization. Due to the high costs for test execution, the research is often developed with the collaboration of several laboratories, finally collating al the results. At this stage problems may arise due to data scattering, often due to (lateral or angular) misalignments between the fixed and the moving machine crossheads. The object of this work is to manufacture and experimentally validate a novel loading-constraining device for misalignment compensation. Conceptual design is applied to investigate on the optimal technical solution. The developed device achieves misalignment reduction with the use of a thrust bearing with sphered housing washers. The bearing is mounted under one of the specimen heads: the inverted orientation of the upper ring, allowing relative lateral displacement between the two rings, and the spherical shape of the washer compensate for offset and angular misalignments. Experimental results showed that such misalignments are respectively reduced to less than 0.02 mm and 0.05°, while the bending strain is lowered to just 6% of the nominal one, so that requirements in different standards for mechanical testing can be fulfilled.

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“…Organic compounds decompose to low molecular weight organic acids (such as formic, acetic and glycolic acids) and carbon dioxide in the conditions of the water steam cycle (high temperature and pressure) [7]. First droplets of condensing steam (so called early condensate) may have a high concentration of these decomposition products, experience a significant decrease of pH and cause corrosion damage in the turbine environment [8][9][10]. Sometimes such corrosion is also termed as the first condensate corrosion (FCC).…”

Section: Introductionmentioning

confidence: 99%

Removal of total organic carbon (TOC) residues from power plant make-up water by activated carbon

Luukkonen

Tolonen

Runtti

et al. 2014

Journal of Water Process Engineering

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The effect of acetic acid on the stress corrosion cracking of 3.5NiCrMoV turbine steels in high temperature water

Cited by 33 publications

References 20 publications

LCF on turbogenerator rotors and coil retaining rings: material characterization and sensitivity analyses

LCF on turbogenerator rotors and coil retaining rings: material characterization and sensitivity analyses

A New Loading-Constraining Device for Mechanical Testing With Misalignment Auto-Compensation

Removal of total organic carbon (TOC) residues from power plant make-up water by activated carbon

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