Combined athermal and isothermal martensite to austenite reversion kinetics, experiment and modelling

H. Kooiker*, E.S. Perdahcıoğlu, T. van den Boogaard

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
26 Downloads (Pure)

Abstract

A novel laser heat treatment setup is presented and used to characterize the reverse transformation of martensite to austenite resulting from highly dynamic laser heat treatments of stainless steel. During laser heat treatments the irradiated spot and its surroundings can experience completely different thermal loads, yet both experience reverse transformation. The experiments are conducted such to reflect these diverse conditions. Next to experiments, a new kinetic model is reported which combines both athermal and isothermal transformation mechanisms to cope with the diversity in conditions in a unified framework. The experimental results show that reverse transformation can proceed extremely fast, yet saturates at intermediate temperatures. Additionally, it is shown that there is good agreement between experiment and model and it is essential to embed both the athermal and isothermal transformation mechanism in the model for achieving this performance. Initial steps towards model validation are performed showing good predictability of a non-isothermal heat treatment with conditions realistic and relevant for industrial laser heat treatments.

Original languageEnglish
Article number109124
JournalMaterials and Design
Volume196
Early online date5 Sep 2020
DOIs
Publication statusPublished - Nov 2020

Keywords

  • UT-Gold-D
  • Austenitic stainless steel
  • Kinetic modelling
  • Laser heat treatment
  • Phase reversal
  • Thermally activated transformation
  • Athermal transformation

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