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Träfflista för sökning "hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Materialteknik) hsv:(Metallurgi och metalliska material) srt2:(1995-1999)"

Sökning: hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Materialteknik) hsv:(Metallurgi och metalliska material) > (1995-1999)

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  • Recina, Viktor, 1968, et al. (författare)
  • Sample preparation and microstructural characterization of the gamma titanium aluminide Ti-48Al-2W-0.5Si
  • 1997
  • Ingår i: Materials Characterization. - 1044-5803. ; 38:4-5, s. 287-300
  • Tidskriftsartikel (refereegranskat)abstract
    • Preparing samples that faithfully reveal all microstructural features in γ-TiAl-base alloys for both optical and scanning electron microscope studies is fraught with difficulties. This study demonstrates that satisfactory results can be obtained through mechanical grinding, polishing, and proper etching. A preparation recipe is presented. Nine lots of investmentcast γ-TiAl material with the nominal composition of Ti-48Al-2W-0.5Si have been characterized through optical and scanning electron microscope examinations. The study shows that a small depletion in Al content has a large effect on the microstructure. The duplex microstructure with a lamellar Full-size image (
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  • Andersson, Henrik C.M., et al. (författare)
  • Creep crackgrowth in ex service weld metal of 0.5CrMoV
  • 1999
  • Ingår i: Cape 99.
  • Konferensbidrag (refereegranskat)abstract
    • Accurate assessment of the integrity of high temperature components will be of ever increasing importance. The reason for this is that many power plants have reached and exceeded their design life and the number of detected defects increases. This is accentuated by the improvement of the methods for non-destructive testing which means that more and smaller defects will be detected. The possibility to assess the influence of defects on the integrity of high temperature components, will be of vital importance to maintain safe and cost effective power plants. The aim of the present work is to increase the understanding of the influence of service exposure on the remaining life of components in a high temperature plant. The investigation aims to creep test exserviceweld material, 14MoV 6 3, from a Swedish power plant. Thematerial has been in service for a period of about 80 000 hours at atemperature of 530-540 °C and with a nominal hoop stress of 52MPa.Both uniaxial and compact tension creep tests have been performedat a temperature of 550 °C. The stress range used was between 130MPa and 170 MPa for the uniaxial creep tests. For the creep crack growth tests the reference stress was ranging between 122 MPa and146 MPa. A remaining life assessment according to the R5 procedure is included, where material data from the present experimental study is used. The analysis suggests that a defect or a crack with a depth of 2 mm and a length of 5 mm can be left unattended for a season of service under the condition that the service parameters are not changed. A comparison with the assessment of cracks, found in the same plant as the material for the experimental studies came from, and their known extension during service, is included. A parametric study where load level and type of initial defect/crack are varied is also included.
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