Internal Quenching: Ideal Heat Treatment for Difficult to Access Component Sections∗
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F. Muehl
Abstract
The heat treatment method Internal Quenching constitutes an alternative method to increase the surface strength of internally loaded high pressure steel components like common rail parts, pipelines, or valves. With the prototypic Internal Quenching device, which was built up at IAM-WK, it is possible to generate hardened surfaces and influence residual stresses in the inner surface of through-drilled parts. This is reached through an austenitisation followed by an internal quenching step, which leads to a martensitic microstructure and compressive residual stresses. Furthermore, it is possible to heat the outer surface by inductive heating during the quenching process which helps to avoid a through hardening of the parts. Due to that various heat treatment strategies can be realized and the residual stresses in the inner surface could be tailored to the load situation.
Kurzfassung
Internal Quenching ist ein alternatives Wärmebehandlungsverfahren zur Verbesserung der Oberflächenfestigkeit innenbelasteter Hochdruck-Stahlkomponenten wie Common Rail-Systeme, Pipelines oder Ventile. Anhand des am IAM-WK entwickelten Internal Quenching-Prototyps können Innenbohrungen von Bauteilen mit Durchgangsbohrungen gehärtet und der Eigenspannungszustand beeinflusst werden. Erreicht wird dies durch Austenitisieren und einem nachfolgenden inneren Abschrecken, wodurch ein martensitisches Gefüge und Druckeigenspannungen erzeugt werden. Zudem können äußere Bereiche durch induktives Erwärmen während des Abschreckprozesses erhitzt werden, um ein Durchhärten der Bauteile zu vermeiden. Hierdurch können unterschiedliche Wärmebehandlungsstrategien umgesetzt und der Eigenspannungszustand an innen liegenden Oberflächen auf die jeweilige Belastungssituation angepasst werden.
References
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© 2019, Carl Hanser Verlag, München
Articles in the same Issue
- Praxis-Informationen/From and for Practice
- AWT Info
- HTM-Praxis
- Kurzfassungen/Abstracts
- Kurzfassungen
- Inhalt/Contents
- Inhalt
- Scientific Contributions/Fachbeiträge
- A Screening Approach for Rapid Qualitative Evaluation of Residual-Stress States – Application to Laser-Hardened Microalloyed Steel
- Surface Layer Microstructure of Carburised and Bainitically Transformed Parts and their Mechanical Properties∗
- Adjustment of Lifetime-Increasing Surface Layer States by Complementary Machining∗
- Internal Quenching: Ideal Heat Treatment for Difficult to Access Component Sections∗
- Impact of the Spheroidization Annealing on the Intensification or Mitigation of the Initial Pearlite Banding Degree Presented in Wire Rolled State
Articles in the same Issue
- Praxis-Informationen/From and for Practice
- AWT Info
- HTM-Praxis
- Kurzfassungen/Abstracts
- Kurzfassungen
- Inhalt/Contents
- Inhalt
- Scientific Contributions/Fachbeiträge
- A Screening Approach for Rapid Qualitative Evaluation of Residual-Stress States – Application to Laser-Hardened Microalloyed Steel
- Surface Layer Microstructure of Carburised and Bainitically Transformed Parts and their Mechanical Properties∗
- Adjustment of Lifetime-Increasing Surface Layer States by Complementary Machining∗
- Internal Quenching: Ideal Heat Treatment for Difficult to Access Component Sections∗
- Impact of the Spheroidization Annealing on the Intensification or Mitigation of the Initial Pearlite Banding Degree Presented in Wire Rolled State
