Stress Relaxation by Transformation Plasticity under the Martensitic Transformation in Steels
-
D. Ivanov
and L. Markegård
Abstract
Transformation plasticity is considered as a phenomenon limiting the actual stress for any specified strain rate under conditions of phase transformation. A one-dimensional model of a steel bar strained under martensitic transformation is provided. Discussion is limited to a series of accepted assumptions, such as athermal kinetics of martensite transformation, monotonic evolution of temperature and constant transformation plasticity parameter. An equivalent tangent modulus is deduced indicating the decisive parameters influencing the softening modes. The obtained model is utilized together with well-known transformation plasticity laws and martensite transformation kinetics to demonstrate an actual softening of steels under the martensitic transformation.
Kurzfassung
Umwandlungsplastizität wird als ein Phänomen betrachtet, das die aktuelle Spannung während einer Phasenumwandlung unabhängig von der vorherrschenden Dehnrate begrenzt. Im Rahmen dieser Arbeit wird ein eindimensionales Modell eines beanspruchten Stahlstabs unter martensitischer Umwandlung vorgestellt. Der Ansatz ist durch eine Reihe von akzeptierten Annahmen begrenzt wie eine athermische Kinetik der Martensitumwandlung, monotone Temperaturentwicklung und konstanter Parameter der Umwandlungsplastizität. Es wird ein äquivalenter Tangentenmodul abgeleitet, der die entscheidenden Parameter erkennen lässt, die die Entfestigung beeinflussen. Das so erhaltene Modell wird mit verschiedenen in der Literatur vorliegenden Beschreibungen der Umwandlungsplastizität und der Kinetik der Martensitbildung genutzt, um eine Entfestigung von Stählen während der martensitischen Umwandlung aufzuzeigen.
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Articles in the same Issue
- Veranstaltungen/Events
- Veranstaltungen
- HTM-Praxis
- HTM-Praxis
- Kurzfassungen/Abstracts
- Kurzfassungen
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Hardening Distortions Related to Segregations in Crown Wheels
- Consequences of Bend Straightening Processes on Residual Stresses and Strength of Quenched and Tempered Steels
- Distortion Control through Synchronized Vacuum Heat Treatment
- Distortion of Gears and Sliding Sleeves for Truck Gear Boxes – a Systematical Analysis of Different Heat Treatment Concepts
- Stress Relaxation by Transformation Plasticity under the Martensitic Transformation in Steels
Articles in the same Issue
- Veranstaltungen/Events
- Veranstaltungen
- HTM-Praxis
- HTM-Praxis
- Kurzfassungen/Abstracts
- Kurzfassungen
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Hardening Distortions Related to Segregations in Crown Wheels
- Consequences of Bend Straightening Processes on Residual Stresses and Strength of Quenched and Tempered Steels
- Distortion Control through Synchronized Vacuum Heat Treatment
- Distortion of Gears and Sliding Sleeves for Truck Gear Boxes – a Systematical Analysis of Different Heat Treatment Concepts
- Stress Relaxation by Transformation Plasticity under the Martensitic Transformation in Steels