Paper Number
PO30 

Session
Poster Session

Title
High temperature dynamic mechanical analysis of glass and damascene steel in flexure mode up to 950 °C

Presentation Date and Time
October 13, 2021 (Wednesday) 6:30

Track / Room
Poster Session / Ballroom 1-2-3-4

Authors (Click on name to view author profile)

  1. Walluch, Matthias (Anton Paar GmbH, Rheology)
  2. Ehgartner, Daniela (Anton Paar GmbH, Rheology)
  3. Shetty, Abhishek (Anton Paar USA, Rheology)
  4. Giehl, Christopher (Anton Paar, Germany, Rheology)
  5. Schuetz, Denis (Anton Paar, GmBH, Rheology)

Author and Affiliation Lines (in printed abstract book)
Matthias Walluch1, Daniela Ehgartner1, Abhishek Shetty2, Christopher Giehl3 and Denis Schuetz1
1Rheology, Anton Paar GmbH, Graz, Austria; 2Rheology, Anton Paar USA, Ashland, VA 23005; 3Rheology, Anton Paar, Germany, Ostfildern, Germany

Speaker / Presenter 
Shetty, Abhishek

Keywords
experimental methods; additive manufacturing; applied rheology; composites; glasses; polymer melts; rheology methods

Text of Abstract
Dynamic mechanical analysis (DMA) is a powerful method to characterize viscoelastic properties and phase transitions for a wide range of materials. Currently, it is mainly used to characterize polymers via determination of storage and loss moduli (E or G) to investigate the effect of temperature and to detect transitions of the mobility on a molecular level (e.g. the glass transition temperature). While production and application temperatures for polymers are usually limited to several hundred degrees, material properties of glasses and metals require characterization at temperatures exceeding 600 °C. This contribution introduces a modular setup based on Modular Compact Rheometer (MCR), linear measuring drive and convection temperature device which enables the characterization of materials at temperatures up to 950 °C. Application examples are presented to show the use of DMA in flexural mode (three-point bending) on glass and damascene steel (with the typical complex, layered laminate structure). The results provide data on stiffness, damping properties, inner structure and softening as affected by temperature. DMA on glass reveals the effect of the oscillatory frequency on the material’s properties. The temperature of softening and other viscoelastic features experiences a significant shift when changing this parameter. This underlines the advantage of DMA for material characterization and process optimization. Further, it highlights its strength compared to other thermo-analytical methods like Dynamic Scanning Calorimetry (DSC), where only static conditions can be simulated. In case of damascene steel, DMA enables to track the hardening and tempering curves of both the individual steel components and the complex layered laminate, thus providing an TTT diagram of the laminated material. Further, using different cuts (orientations) of the laminate it is possible to understand how the microlayers of the two steels interact in regards to their complex moduli and phase transitions.