R
Ralph Jörg Hellmig
Researcher at Clausthal University of Technology
Publications - 36
Citations - 1661
Ralph Jörg Hellmig is an academic researcher from Clausthal University of Technology. The author has contributed to research in topics: Microstructure & Severe plastic deformation. The author has an hindex of 18, co-authored 36 publications receiving 1518 citations.
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On the contribution of carbides and micrograin boundaries to the creep strength of tempered martensite ferritic steels
TL;DR: In this paper, the authors compared the creep behaviour and the microstructural stability of a tempered martensite ferritic steel (German grade: X20) with that of a strongly deformed binary Fe10Cr alloy.
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Correlation between subgrains and coherently scattering domains
TL;DR: In this paper, it was shown that dipolar dislocation walls without differences in orientation also break down coherency of X-rays scattering, and that the coherently scattering domain size provided by X-ray line profile analysis provides subgrain or cell size bounded by dislocation boundaries or dipolar walls.
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Dislocation density-based modeling of deformation behavior of aluminium under equal channel angular pressing
TL;DR: In this paper, the deformation behavior of aluminium during equal channel angular pressing (ECAP) was calculated on the basis of a dislocation density-based model, and the behavior of the material under ECAP was simulated using the finite element method (FEM).
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Thermal stability of ECAP processed pure copper
TL;DR: In this article, the texture and texture evolution of pure copper (99.95%) after equal-channel angular pressing (ECAP) with route Bc up to 12 passes and subsequent heat treatment were investigated.
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Dislocation structure and crystallite size in severely deformed copper by X-ray peak profile analysis
TL;DR: In this paper, the X-ray diffraction peak profile analysis as a function of strain was carried out on copper specimens with equal channel angular pressing (ECAP) up to eight passes and it was found that the crystallite size is reduced to a few tens of nanometers already at 0.7 and it does not change significantly during further deformation.