Atom Probe Analysis of the First Stage of Tempering of Iron–Carbon–Nitrogen Martensite
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Marc J. van Genderen
Abstract
The first stage of tempering of an iron–carbon–nitrogen martensite (containing 1.7 at.% C and 3.3 at.% N) was studied by atom probe analysis. Different stages of transformation were obtained by subjecting various specimens to different heat treatments. Analysis of the mass spectra revealed the presence of peaks not observed on decomposing binary FeC and FeN martensites: molecular ions occurred that contained both carbon and nitrogen. Upon tempering the FeCN martensitic specimens, interstitial-enriched regions develop. In most of these regions one type of interstitial is predominantly present but a small amount of the other type is present too. In combination with previously obtained X-ray diffraction results it was concluded that two types of transition precipitates are formed: nitrogen-rich regions also containing carbon and identified as α′′-like precipitates (α′′ is the transition precipitate formed in binary FeN martensite), and carbon-rich regions also containing nitrogen and identified as ε/η-like precipitates (ε/η is the transition precipitate formed in binary FeC martensite).
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© 1997 Carl Hanser Verlag, München
Articles in the same Issue
- Frontmatter
- Aufsätze
- Gradient Materials: An Overview of a Novel Concept
- On the Systematics of Phase Equilibria in Complex Magnesium-Rare Earth Systems: Gd–Y–Mg System
- Discussion of the Al–Co Phase Diagram
- Phase Equilibria in the Al-rich Portion of the Ternary System Co– Ni –Al at 75 and 78 at.% Al
- Phases and Phase Equilibria in the Quaternary System Ti –Cu–Al –N at 850 °C
- Atom Probe Analysis of the First Stage of Tempering of Iron–Carbon–Nitrogen Martensite
- Deformation Behaviour and Two-way Shape Memory Effect of NiTi Alloys
- Physical Interpretation of a Viscoplastic Model Applied to High Temperature Performance of a Nickel-base Superalloy
- Prediction of Solute Concentration Profiles for Discontinuous Dissolution
- Interdiffusion in the Ti-rich Phases of the Ti – Al System
- Interdiffusion Studies in the System MgO–FeO
- Crystallization of MgO–B2O3–SiO2 Slag Observed by In Situ TEM
- Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
- Personen
- Buchbesprechungen
- P. Gümpel: Rostfreie Stähle
- Terminkalender
Articles in the same Issue
- Frontmatter
- Aufsätze
- Gradient Materials: An Overview of a Novel Concept
- On the Systematics of Phase Equilibria in Complex Magnesium-Rare Earth Systems: Gd–Y–Mg System
- Discussion of the Al–Co Phase Diagram
- Phase Equilibria in the Al-rich Portion of the Ternary System Co– Ni –Al at 75 and 78 at.% Al
- Phases and Phase Equilibria in the Quaternary System Ti –Cu–Al –N at 850 °C
- Atom Probe Analysis of the First Stage of Tempering of Iron–Carbon–Nitrogen Martensite
- Deformation Behaviour and Two-way Shape Memory Effect of NiTi Alloys
- Physical Interpretation of a Viscoplastic Model Applied to High Temperature Performance of a Nickel-base Superalloy
- Prediction of Solute Concentration Profiles for Discontinuous Dissolution
- Interdiffusion in the Ti-rich Phases of the Ti – Al System
- Interdiffusion Studies in the System MgO–FeO
- Crystallization of MgO–B2O3–SiO2 Slag Observed by In Situ TEM
- Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
- Personen
- Buchbesprechungen
- P. Gümpel: Rostfreie Stähle
- Terminkalender
