---
_id: '67171'
abstract:
- lang: eng
  text: <jats:p>Flow forming of metastable austenites is an innovative, incremental
    metal forming process with special capabilities due to the TRIP effect. However,
    the TRIP effect during flow forming is significantly affected by disturbances
    and especially batch fluctuations leading to process uncertainty. This aspect
    is further analyzed and quantified in this paper to give insights on how to minimize
    the impact of uncertainty. For this purpose, semifinished parts and resulting
    flow forming workpieces are systemically characterized concerning their properties
    and the property uncertainty supported by mathematical methods like correlation
    analysis and error propagation. A result is that the most influencing impact factor
    on the strain induced α’-martensite volume fraction as a material property are
    batch fluctuations, specifically the variations of the chemical composition. Those
    especially appear from batch to batch, but also within a batch accompanied by
    e.g. temperature effects. To counter this challenge, different methods from control
    theory like closed-loop property control and adaptive control can be applied to
    flow forming. Thus, uncertainty will be reduced to increase process robustness
    and to enable industrial exploitation of the TRIP effect in flow forming of metastable
    austenitic steels.</jats:p>
article_type: original
author:
- first_name: Lukas
  full_name: Kersting, Lukas
  last_name: Kersting
- first_name: Mustafa
  full_name: Koyuncu, Mustafa
  last_name: Koyuncu
- first_name: Bahman
  full_name: Arian, Bahman
  id: '36287'
  last_name: Arian
- first_name: Julian
  full_name: Rozo Vasquez, Julian
  last_name: Rozo Vasquez
- first_name: Ansgar
  full_name: Trächtler, Ansgar
  id: '552'
  last_name: Trächtler
- first_name: Werner
  full_name: Homberg, Werner
  id: '233'
  last_name: Homberg
- first_name: Frank
  full_name: Walther, Frank
  last_name: Walther
citation:
  ama: Kersting L, Koyuncu M, Arian B, et al. Reducing the Uncertainty in Flow Forming
    of Metastable Austenites. <i>Solid State Phenomena</i>. 2026;389:253-266. doi:<a
    href="https://doi.org/10.4028/p-gad5rr">10.4028/p-gad5rr</a>
  apa: Kersting, L., Koyuncu, M., Arian, B., Rozo Vasquez, J., Trächtler, A., Homberg,
    W., &#38; Walther, F. (2026). Reducing the Uncertainty in Flow Forming of Metastable
    Austenites. <i>Solid State Phenomena</i>, <i>389</i>, 253–266. <a href="https://doi.org/10.4028/p-gad5rr">https://doi.org/10.4028/p-gad5rr</a>
  bibtex: '@article{Kersting_Koyuncu_Arian_Rozo Vasquez_Trächtler_Homberg_Walther_2026,
    title={Reducing the Uncertainty in Flow Forming of Metastable Austenites}, volume={389},
    DOI={<a href="https://doi.org/10.4028/p-gad5rr">10.4028/p-gad5rr</a>}, journal={Solid
    State Phenomena}, publisher={Trans Tech Publications, Ltd.}, author={Kersting,
    Lukas and Koyuncu, Mustafa and Arian, Bahman and Rozo Vasquez, Julian and Trächtler,
    Ansgar and Homberg, Werner and Walther, Frank}, year={2026}, pages={253–266} }'
  chicago: 'Kersting, Lukas, Mustafa Koyuncu, Bahman Arian, Julian Rozo Vasquez, Ansgar
    Trächtler, Werner Homberg, and Frank Walther. “Reducing the Uncertainty in Flow
    Forming of Metastable Austenites.” <i>Solid State Phenomena</i> 389 (2026): 253–66.
    <a href="https://doi.org/10.4028/p-gad5rr">https://doi.org/10.4028/p-gad5rr</a>.'
  ieee: 'L. Kersting <i>et al.</i>, “Reducing the Uncertainty in Flow Forming of Metastable
    Austenites,” <i>Solid State Phenomena</i>, vol. 389, pp. 253–266, 2026, doi: <a
    href="https://doi.org/10.4028/p-gad5rr">10.4028/p-gad5rr</a>.'
  mla: Kersting, Lukas, et al. “Reducing the Uncertainty in Flow Forming of Metastable
    Austenites.” <i>Solid State Phenomena</i>, vol. 389, Trans Tech Publications,
    Ltd., 2026, pp. 253–66, doi:<a href="https://doi.org/10.4028/p-gad5rr">10.4028/p-gad5rr</a>.
  short: L. Kersting, M. Koyuncu, B. Arian, J. Rozo Vasquez, A. Trächtler, W. Homberg,
    F. Walther, Solid State Phenomena 389 (2026) 253–266.
date_created: 2026-09-18T08:32:16Z
date_updated: 2026-09-22T10:02:23Z
department:
- _id: '153'
- _id: '156'
- _id: '241'
doi: 10.4028/p-gad5rr
intvolume: '       389'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://www.scientific.net/SSP.389.253.pdf
oa: '1'
page: 253-266
publication: Solid State Phenomena
publication_identifier:
  issn:
  - 1662-9779
publication_status: published
publisher: Trans Tech Publications, Ltd.
quality_controlled: '1'
status: public
title: Reducing the Uncertainty in Flow Forming of Metastable Austenites
type: journal_article
user_id: '82875'
volume: 389
year: '2026'
...