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- Hosseini, Vahid, 1987-, et al.
(författare)
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Ferrite content measurement in super duplex stainless steel welds
- 2019
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Ingår i: Welding in the World. - : Springer Verlag. - 0043-2288 .- 1878-6669. ; 63:2, s. 551-563
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Tidskriftsartikel (refereegranskat)abstract
- Approaches to determining ferrite fraction (%) and ferrite number (FN) were examined for super duplex stainless steel (SDSS) welds. A reference sample was produced by bead-on-plate gas–tungsten arc welding of a type-2507 SDSS plate. By comparing different etchants and measurement practices, it was realized that etching with modified Beraha followed by computerized image analysis (IA) was the most accurate and quickest technique to measure ferrite fraction, which determined the same ferrite fraction (68.0 ± 2.6%) as that measured by electron diffraction backscattered analysis (67.6 ± 2.3%). A Round Robin test was performed on a reference sample at University West, Swerea KIMAB, Outokumpu Stainless, and Sandvik Materials Technology to investigate the repeatability of the technique. The ferrite fraction measurements performed at different laboratories showed very small variations, which were in the range of those seen when changing microscope in the same laboratory. After verification of the technique, the relationship between ferrite fraction and ferrite number (measured with FERITSCOPE®) was determined using 14 single (root) pass welds, including butt, corner, and T-, V-, and double V-joint geometries. The best-fit equation found in this study was ferrite number (FN) = 1.1 × ferrite fraction (%). To conclude, the ferrite fraction technique suggested in the present paper was accurate and repeatable, which made it possible to determine a ferrite fraction–ferrite number formula for SDSS single-pass welds.
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- Östberg, Kjell, 1948-
(författare)
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Palme, utbildningspolitiken och maj 1968
- 2020
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Ingår i: 1968 och pedagogiken. - Huddinge : Södertörns högskola. - 9789189109179 - 9789189109186 ; , s. 37-48
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Bokkapitel (refereegranskat)
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- Östberg, Kjell
(författare)
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Sweden and the long ‘1968’ : break or continuity?
- 2008
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Ingår i: Scandinavian Journal of History. - : Informa UK Limited. - 0346-8755 .- 1502-7716. ; 33, s. 339-352
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Tidskriftsartikel (refereegranskat)abstract
- The first part gives a chronological overview of the Swedish ‘1968’, in this article defined as a phenomenon with its roots in the late 1950s and it’s end around 1980. Three phases are identified: a ‘liberal’ until 1965, a ‘red’ in the late 1960s and the ‘diversified’ 1970s. Underlying this time schedule are two characteristics of the Swedish ‘1968’ in its extended form: the role of the social movements and the interaction between old and new movements; and the unique role of the intellectuals. The second part discusses the (late and limited) research so far on this topic in Sweden. The academic works are still few and the critical debate little developed. One of the topics discussed is to what extent ‘1968’ was something fundamentally new and to what extent it was influenced by older social movements.
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