Boron segregation and creep in ultra-fine grained tempered martensite ferritic steels
-
G. Eggeler
and
A. Dlouhy
Abstract
The creep strength of ultra-fine grained tempered martensite ferritic steels with 9 to 12 wt.% chromium is significantly increased when small amounts of boron (in the 100 wt-ppm regime) are added. In the present note, experimental evidence from the literature is reviewed and previous explanations for the role of boron are summarized. The explanation for the effect of boron on creep strength must leave space for the simultaneous effect of boron on ductility. A scenario is suggested where boron segregates to micrograin boundaries which often have subgrain-boundary character. Boron can decrease the subgrain-boundary energy, decrease the velocity of subgrain-boundary migration, hinder knitting reactions between free dislocations and subgrain-boundaries and thus contribute to creep strength. This decrease of intensity of interface plasticity contributes to a decrease in ductility. Boron may moreover decrease the strength of the interface and thus promote brittleness. Further work is required to fully account for the role of boron on the mechanical properties of tempered martensite ferritic steels.
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© 2005 Carl Hanser Verlag, München
Articles in the same Issue
- Frontmatter
- Editorial
- Heinrich Oettel – 65 Jahre
- Articles Basic
- Misorientations and geometrically necessary dislocations in deformed copper crystals: A microstructural analysis of X-ray rocking curves
- Microstructure and lattice defects in highly deformed metals by X-ray diffraction whole powder pattern modelling
- Magnetoplasticity
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- Finite-element analysis of the hot-pressing consolidation of continuous Al2O3 fibers-reinforced NiAl composites
- Modelling the stress state of a thermal barrier coating system at high temperatures
- Impedance spectroscopy of thermal barrier coatings as non-destructive evaluation tool for failure detection
- Diffraction by image processing and its application in materials science
- On the preferred orientation in Ti1–xAlxN and Ti1–x–yAlxSiyN thin films
- Boron segregation and creep in ultra-fine grained tempered martensite ferritic steels
- Numeric simulation of the α/γ-phase ratio of ferritic-austenitic duplex steels
- Deformation behaviour and microscopic investigations of cyclically loaded railway wheels and tyres
- Similarity considerations on the simulation of turning processes of steels
- Crack-tip residual stresses and crack propagation in cyclically-loaded specimens under different loading modes
- On the effect of oxide scale stability on the internal nitridation process in high-temperature alloys
- Nitriding behaviour of the intermetallic alloy FeAl
- Material-related fundamentals of cutting techniques for GaAs wafer manufacturing
- Determination of RuAl phase boundaries in binary Ru–Al phase diagram at room temperature and 1200 °C
- On the Orowan stress in intermetallic ODS alloys and its superposition with grain size and solid solution hardening
- Effects of particle reinforcement on creep behaviour of AlSi1MgCu
- Effect of preaging on the precipitation behaviour of AlMgSi1
- Corrosion behaviour of hard coatings on Mg substrates
- Phase transformations in creep resistant MgYNdScMn alloy
- Notifications/Mitteilungen
- Personal/Personelles
- Press/Presse
- Conferences
Articles in the same Issue
- Frontmatter
- Editorial
- Heinrich Oettel – 65 Jahre
- Articles Basic
- Misorientations and geometrically necessary dislocations in deformed copper crystals: A microstructural analysis of X-ray rocking curves
- Microstructure and lattice defects in highly deformed metals by X-ray diffraction whole powder pattern modelling
- Magnetoplasticity
- Articles Applied
- Finite-element analysis of the hot-pressing consolidation of continuous Al2O3 fibers-reinforced NiAl composites
- Modelling the stress state of a thermal barrier coating system at high temperatures
- Impedance spectroscopy of thermal barrier coatings as non-destructive evaluation tool for failure detection
- Diffraction by image processing and its application in materials science
- On the preferred orientation in Ti1–xAlxN and Ti1–x–yAlxSiyN thin films
- Boron segregation and creep in ultra-fine grained tempered martensite ferritic steels
- Numeric simulation of the α/γ-phase ratio of ferritic-austenitic duplex steels
- Deformation behaviour and microscopic investigations of cyclically loaded railway wheels and tyres
- Similarity considerations on the simulation of turning processes of steels
- Crack-tip residual stresses and crack propagation in cyclically-loaded specimens under different loading modes
- On the effect of oxide scale stability on the internal nitridation process in high-temperature alloys
- Nitriding behaviour of the intermetallic alloy FeAl
- Material-related fundamentals of cutting techniques for GaAs wafer manufacturing
- Determination of RuAl phase boundaries in binary Ru–Al phase diagram at room temperature and 1200 °C
- On the Orowan stress in intermetallic ODS alloys and its superposition with grain size and solid solution hardening
- Effects of particle reinforcement on creep behaviour of AlSi1MgCu
- Effect of preaging on the precipitation behaviour of AlMgSi1
- Corrosion behaviour of hard coatings on Mg substrates
- Phase transformations in creep resistant MgYNdScMn alloy
- Notifications/Mitteilungen
- Personal/Personelles
- Press/Presse
- Conferences
