The austenite to polygonal ferrite transformation in low-alloy steel: multi-phase-field simulation

Shaojie Lv, Hong-Hui Wu (Corresponding Author), Kaiyang Wang, Jiaming Zhu, Shuize Wang, Guilin Wu, Junheng Gao, Xu-Sheng Yang, Xinping Mao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)

Abstract

The austenite to ferrite phase transformation is a critical structural transformation in steel production, where the morphology and grain size of ferrite substantially influence the mechanical properties of steel materials. In this work, the influences of cooling rate, prior austenite grain size (PAGS), and Mn content on the microstructure evolution and component distribution of austenite-to-polygonal ferrite phase transformation are investigated by a multi-phase-field model. It is found that higher cooling rates intensify the driving force for austenite to polygonal ferrite phase transformations and delay the phase transformation process. As PAGS decrease, the increased proportion of austenite grain boundary offers more nucleation sites for polygonal ferrite and thus refines the polygonal ferrite grain. Additionally, increased Mn content results in significant grain refinement due to a reduction in the transformation temperature of austenite to polygonal ferrite. This work provides valuable insights into adjusting and designing desired microstructures of polygonal ferrite for enhancing the mechanical performance of steel.
Original languageEnglish
Pages (from-to)9630-9643
Number of pages14
JournalJournal of Materials Research and Technology
Volume24
DOIs
Publication statusPublished - May 2023

Keywords

  • Phase-field simulation
  • Polygonal ferrite
  • Cooling rate
  • Prior austenite grain size
  • Mn content

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