Konflikt och samförstånd : Arbetarhistoria idag

Introduction to a volume of collected essays from a conference on labour history in Landskrona 2009

Stadens sociala ordning : Stånd och klass i Malmö under sjuttonhundratalet

I denna bok presenteras nya perspektiv på det svenska ståndssamhället. Det görs genom en undersökning av Malmö mellan 1720 och 1780. Ståndssamhället var något mycket mer än bara indelningen i adel, präster, borgare och bönder. Stånd var beroende av att gränser mellan grupper markerades genom olika juridiska rättigheter. Det handlade dock inte bara om juridik. Statusindelningar upprätthölls i befolkningens vardagliga handlande i en ärans ekonomi. I boken hävdas att stånd och klass inte står i motsättning till varandra och att sjuttonhundratalet kan ha varit ståndssamhällets storhetstid.Boken har också mycket att säga den som vill veta mer om Malmö. I den får läsaren veta hur stadens sociala geografi såg ut, vem som satt var vid gudstjänsterna i S:t Petri kyrka och hur befolkningen fördelades på stadens olika begravningsplatser. Här får läsaren också läsa om hur det gick till när bödeln försökte få sin avlidna hustru buren till graven av något av stadens likbärarelag, om hur fabrikörskan Gottschick kunde nå en position som en av stadens ledande näringsidkare och om hur färjemannen Bengt Nilsson lyckades etablera sig i stadens elit

High temperature compression of Mo(Si,Al)2-Al2O3 composites

The aim of this study was to investigate the effect on high temperature of mechanical properties of adding Al2O3 particles to polycrystalline Mo(Si,Al)2. Mo(Si,Al)2-Al2O3 composites, containing 0–25 wt% Al2O3 particles have been compression tested at 1300 \ub0C, and the microstructure after deformation was studied using electron backscatter diffraction. It was shown that even small amounts (5 wt%) of Al2O3 particles resulted in a grain-refined material through inhibition of grain growth during sintering, which lead to lower flow stresses compared to the coarse-grained Al2O3-free material. The inverse grain size effect and post-test microstructure investigations suggest that creep-like deformation mechanisms dominate in fine grained Mo(Si,Al)2-Al2O3 composites at 1300 \ub0C. In the materials containing 5–15 wt% Al2O3, the maximum stress decreased with increasing Al2O3 content. In materials with higher Al2O3 additions, the maximum stress increased with the Al2O3 addition, but did not reach the strength levels in the Al2O3-free reference material. It is suggested that the deformation behaviour is affected by electroplasticity effects as resistive heating was used. Electroplasticity contributes to the decrease in maximum stress observed in the lower Al2O3 containing materials, while this is outweighed by particle strengthening at higher Al2O3 contents

High temperature deformation of polycrystalline C40 Mo(Si,Al)2

Polycrystalline Mo(Si,Al)2 with C40 crystal structure was deformed in compression with a strain rate of 10−4 s−1 at 1300 \ub0C. The specimens were deformed to a strain of 10%–15% and showed maximum stresses around 150 MPa prior to pronounced softening. No crack formation or significant increase in porosity could be observed. Post-test microstructure analysis revealed that the material was inhomogeneously deformed on both inter- and intragranular levels. Dynamic recrystallization occurred alongside low angle grain boundary formation in highly deformed grains. Furthermore, complex intragranular deformation fields suggest that slip systems other than 21̄1̄0[0001] may be active during deformation

Exploring the Effect of Silicon on the High Temperature Corrosion of Lean FeCrAl Alloys in Humid Air

A new approach to reduce the chromium and aluminium concentrations in FeCrAl alloys without significantly impairing corrosion resistance is to alloy with 1-2 wt.% silicon. This paper investigates the "silicon effect" on oxidation by comparing the oxidation behavior and scale microstructure of two FeCrAl alloys, one alloyed with silicon and the other not, in dry and wet air at 600 degrees C and 800 degrees C. Both alloys formed thin protective oxide scales and the Cr-evaporation rates were small. In wet air at 800 degrees C the Si-alloyed FeCrAl formed an oxide scale containing mullite and tridymite together with alpha- and gamma-alumina. It is suggested that the reported improvement of the corrosion resistance of Al- and Cr-lean FeCrAl\u27s by silicon alloying is caused by the appearance of Si-rich phases in the scale