Cyclic quenching treatment doubles the Charpy V-notch impact energy of a 2.3 GPa maraging steel

Xinlei Zhou, Chunni Jia, Peng Mi, Honglin Zhang, Wei Yan*, Wei Wang, Mingyue Sun, Sybrand van der Zwaag, Lijian Rong

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

A cyclic quenching treatment (CQT) succeeded in turning a 2.3 GPa maraging steel with a Charpy impact energy of 9 J into a new grade with the same strength but a Charpy impact energy of 20 J upon 4 cyclic treatments. The improvement of mechanical properties is attributed to the refinement and increased chemical heterogeneity of the martensitic substructure, rather than the refinement of prior austenite grain (PAG), as well as the Transformation-Induced Plasticity (TRIP) effect facilitated by small austenite grains. The role of local segregation of Ni during CQT in the formation of Ni-rich austenite grains, Ni-rich martensite laths and Ni-poor martensite laths, was investigated and verified by DICTRA simulations. This study highlights the important influence of Ni partitioning behavior during CQT, providing insights into microstructural evolution and mechanical properties.

Original languageEnglish
Pages (from-to)311-328
Number of pages18
JournalJournal of Materials Science and Technology
Volume209
DOIs
Publication statusPublished - 2025

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • Austenite
  • Cyclic quenching treatment
  • Maraging steel
  • Ni partitioning
  • Toughness
  • Ultrafine lath

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