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Properties of high alloyed CrMnNi steels with strain induced a' martensite formation

Jahn A., Kovalev A., Wolf S., Weiss A., Kruger L., Scheller P. R.

Inżynieria Materiałowa

2010

Vol. 31, nr 3

238-242

Based on the Fe-Cr-Mn-Ni system a new generation of stainless steels with TRIP effect is proposed. The experimental investigations show how the mechanical properties, the energy absorption, the M s temperature and the fraction of the martensite formed are influenced by varying Ni contents. The strengths of the investigated steels increases and the strains decreases with an increasing fraction of strain induced formed a' martensite. The mechanical properties in the as-cast state of the material are quite similar to those in the rolled state.

Praca przedstawia nową generację stali z układu Fe-Cr-Mn-Ni z efektem TRIP. Przeprowadzone eksperymenty pozwoliły opisać własności mechaniczne, absorpcję energii, zmiany temperatury M s i udziału martenzytu w funkcji zawartości Ni. Wytrzymałość tych stali rośnie, a zakres odkształcenia plastycznego maleje wraz udziałem prowadzanego martenzytu alfa'. Własności mechaniczne badanych stali w stanie po odlaniu i po walcowaniu są zbliżone.

Boundary layer characteristics and turbulent exchange mechanisms in highly complex terrain

Rotach M., Andretta M., Calanca P., Weigel A., Weiss A.

Acta Geophysica

2008

Vol. 56, no. 1

194-219

The Mesoscale Alpine Programme's Riviera project investigated the turbulence structure and related exchange processes in an Alpine valley by combining a detailed experimental campaign with high-resolution numerical modelling. The present contribution reviews published material on the Riviera Valley's boundary layer structure and discusses new material on the near-surface turbulence structure. The general conclusion of the project is that despite the large spatial variability of turbulence characteristics and the crucial influence of topography at all scales, the physical processes can accurately be understood and modelled. Nevertheless, many of the "text book characteristics" like the interaction between the valley and slope wind systems or the erosion of the nocturnal valley inversion need reconsideration, at least for small non-ideal valleys like the Riviera Valley. The project has identified new areas of research such as post-processing methods for turbulence variables in complex terrain and new approaches for the surface energy balance when advection is non-negligible. The exchange of moisture and heat between the valley atmosphere and the free troposphere is dominated by local "secondary" circulations due to the curvature of the valley axis. Because many curved valleys exist, and operational models still have rather poor resolution, parameterization of these processes may be required.

About the TRIP effect in a metastable austenitic steel and a multiphase steel

Oettel H., Onyuna M.O., Martin U., Weiss A.

Inżynieria Materiałowa

2004

R. XXV, nr 3

179-182