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Träfflista för sökning "WFRF:(Svensson Olof) ;srt2:(2010-2014);lar1:(cth)"

Search: WFRF:(Svensson Olof) > (2010-2014) > Chalmers University of Technology

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1.
  • Golpayegani, Ardeshir, 1975, et al. (author)
  • Microstructure of a Creep-Resistant 10 Pct Chromium Steel Containing 250 ppm Boron
  • 2011
  • In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. - : Springer Science and Business Media LLC. - 1073-5623 .- 1543-1940. ; 42:4, s. 940-951
  • Journal article (peer-reviewed)abstract
    • The microstructure of a trial martensitic chromium steel containing a high content of boron (250 ppm) was characterized in detail in the as-tempered and aged conditions. This steel has a similar composition and heat treatment as the TAF steel that still is unsurpassed in creep strength among all 9 to 12 pct chromium steels. Characterization was performed by using scanning electron microscopy, energy-filtered transmission electron microscopy, secondary ion mass spectroscopy, and atom probe tomography. Focus was placed on investigating different types of precipitates that play a key role in improving the creep resistance of these steels. The low tempering temperature of 963 K (690 A degrees C) is enough for the precipitation of the full volume fraction of both MX and M23C6. A high boron content, more than 1 at. pct, was found in M23C6 precipitates and they grow slowly during aging. The high boron level in the steel results in metal borides rather than BN with the approximate formula (Mo0.66Cr0.34)(2)(Fe0.75V0.25)B-2. Two families of MX precipitates were found, one at lath boundaries about 35 nm in size and one dense inside the laths, only 5 to 15 nm in size.
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2.
  • Knuts, Sören, 1962, et al. (author)
  • Data Driven Continuous Improvement by Six Sigma in Aircraft Industry
  • 2014
  • In: ENBIS-14 in Linz 21 – 25 September 2014.
  • Conference paper (other academic/artistic)abstract
    • Continuous improvements initiated by unsatisfactory output variation often require data or combinations of data from other up-stream variation sources than previously monitored. Three Six Sigma projects have been recently carried out in order to improve the process capability of welded components at GKN Aerospace. Common to these three projects are problems with the measurement systems and sub-sequent analysis related to the Key Characteristics (KC) evaluation. Parameters are traditionally monitored relative their individual requirements but not to the combined set of measures that form the KC. All three projects identified a need to establish a standardized procedure to develop data collection and analysis procedures relative specific KC based on downstream requirements in order to be able to evaluate KC baseline capability.The aim with this article is to recognize the development of an overall measurement system (containing probes, data collection routines and analysis procedures) as enabler of Continuous Improvement of downstream KC capability requirements.Note: GKN Aerospace is a Tier 2 supplier in the Aerospace business with a large variety of components that is available on more than 90% of all new engines.
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