Strain-induced martensite formation in metastable austenitic steels with varying carbon content
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Ulrich Krupp
Abstract
Fatigue tests are performed on cylindrical, sheet and foil specimens to investigate the strain-induced martensitic transformation of austenitic steels. The tests set a variety of strain amplitudes and temperatures as well as various carbon concentrations for the investigated materials in order to broaden the scope of the martensitic transformation and thereby its characterization. It is confirmed that there is a threshold value of plastic strain amplitude for the investigated materials above which the incremental increase in martensite volume fraction in the specimen under continued cyclic loading is of significance. Block-loading tests indicate that cycles at amplitudes below this threshold do not contribute to the austenite transformation. Thermodynamic calculations are applied in order to provide information on the stability of the material with regard to carbon content. It is shown that carbon concentration can be established by gas charging of the materials so that the driving force for transformation can be adjusted purposefully.
Abstract
Es wurden Ermüdungsversuche an zylinderförmigen Proben, Blechproben und Folien durchgeführt, um die dehnungsinduzierte Martensitbildung in austenitischen Stählen zu untersuchen. Neben der Geometrie wurden die Beanspruchungsamplitude, die Versuchstemperatur und der Kohlenstoffgehalt des Probenmaterials variiert, um die Stärke des Einflusses dieser Parameter auf das Umwandlungsverhalten zu charakterisieren. Die Ergebnisse bestätigen, dass ein Beanspruchungsschwellenwert überschritten werden muss, um einen kontinuierlichen Anstieg des Martensitvolumenbruchteils bei zyklischer Belastung zu erhalten. Blockversuche zeigten, dass die Zyklen mit Amplituden unter diesem Schwellenwert nicht zur Umwandlung des Austenits beitragen. Um Informationen über den Einfluss des Kohlenstoffgehalts auf die Stabilität der austenitischen Matrix zu erhalten, wurden thermodynamische Berechnungen zur Auf- und Entkohlung durchgeführt. Die Einstellung des Kohlenstoffgehaltes mit Hilfe einer Gasbe- oder -entladung ermöglicht es, die Triebkraft der martensitischen Umwandlung gezielt einzustellen.
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© 2002 Carl Hanser Verlag, München
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- Notifications/Mitteilungen
- Personal/Personelles
- Books/Bücher
- DGM Conferences/Training
Artikel in diesem Heft
- Frontmatter
- Editorial
- Editorial
- Articles/Aufsätze
- A model for the work hardening of WC–Co “hard metals”
- On the dispersion strengthening mechanisms in ODS materials
- Effect of hydrogen on the mechanical properties of the β titanium alloy Timetal® 21S
- Cyclic deformation behaviour of (α + β) titanium alloys under complex mechanical and physiological loading conditions
- Assessment of the influence of interdendritic shrinkage cavities on the thermo-mechanical fatigue behaviour of the nickel-base superalloy MAR-M247LC
- Effects of static strain aging on residual stress stability and alternating bending strength of shot peened AISI 4140
- On the possibilities to enhance the fatigue properties of ultrafine-grained metals
- New method of determining stress relaxation behavior in creep machines by controlled unloading
- Creep of binary Ni-rich NiTi shape memory alloys and the influence of pre-creep on martensitic transformations
- Interaction of high-cycle fatigue with high-temperature creep in superalloy single crystals
- A unified description of creep in pure and dispersion-strengthened copper
- A new interpretation of flow-stress measurements of high-purity NiAl below room temperature
- A mesoscopic plasticity model accounting for spatial fluctuations of plastic strains, internal stresses and dislocation densities
- Behavior of X-ray peak widths in the Wilkens model of a restrictedly random distribution of dislocations
- Dislocation structure and crystallite size distribution in hexagonal nanomaterials from X-ray peak profile analysis
- Werden gewichtsoptimiert konstruierte Bauteile durch die Verwendung von Leichtmetallen wirklich leichter?*)
- Strain-induced martensite formation in metastable austenitic steels with varying carbon content
- Isothermal bainitic transformation in low alloy steels: factors limiting prediction of the resulting material’s properties
- Fatigue damage evolution in a particulate-reinforced metal matrix composite determined by acoustic emission and compliance method
- Microstructure and modification mechanisms of Si phase in as-thixoformed alloy A356
- Influence of size effect on microstructural changes in cyclically deformed polycrystalline nickel
- Self-diffusion of 71Ge and 31Si in Si –Ge alloys
- On localised corrosive attack, stress corrosion cracking and corrosion fatigue effects in a hardmetal cutting-tool material
- The internal stress during growth of SiC single crystals
- Notifications/Mitteilungen
- Personal/Personelles
- Books/Bücher
- DGM Conferences/Training
