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<p>This study deciphers the crystallographic mechanisms governing austenite reversion under differential heating rates, employing advanced quantitative analysis of nucleation probability at each variant pair and orientation relationship between the prior austenite grain (PAG) and reverted austenite grains (RAGs). It is discovered that elevated heating rates induce a pronounced refinement of PAGs while diminishing orientation inheritance. It is attributed on one hand to the elevated driving force for austenite nucleation with increasing heating rate and on the other hand to the inhibited merging of high angle grain boundaries (HAGBs) during reheating. They concurrently enhance the austenite nucleation density and the chance to develop a differential orientation to the PAG and neighboring RAGs when the heating rate is increased. The RAGs predominantly initiate nucleation at high angle Packet boundaries and Bain group boundaries, with secondary nucleation observed at specific low-angle grain boundaries (LAGBs) under varied heating rates. Elevated heating rates amplify nucleation density across high-angle variant pairs (V1/V2, V1/V3&amp;5, V1/V6) and low-angle pairs (V1/V4, V1/V11&amp;13), which exhibit suppressed activity at 1&#xa0;°C/s. A significantly higher nucleation efficiency is produced for V1/V2, V1/V6 and V1/V11&amp;13 pairs when the heating rate increases from 17 to 130 °C/s.</p>

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On the Heating-Rate-Dependent Crystallographic Mechanisms Governing Austenite Reversion and Grain Refinement

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Z. Q. Wang,
  • X. K. Li,
  • Y. S. Yu,
  • C. J. Shang,
  • R. D. K. Misra

摘要

This study deciphers the crystallographic mechanisms governing austenite reversion under differential heating rates, employing advanced quantitative analysis of nucleation probability at each variant pair and orientation relationship between the prior austenite grain (PAG) and reverted austenite grains (RAGs). It is discovered that elevated heating rates induce a pronounced refinement of PAGs while diminishing orientation inheritance. It is attributed on one hand to the elevated driving force for austenite nucleation with increasing heating rate and on the other hand to the inhibited merging of high angle grain boundaries (HAGBs) during reheating. They concurrently enhance the austenite nucleation density and the chance to develop a differential orientation to the PAG and neighboring RAGs when the heating rate is increased. The RAGs predominantly initiate nucleation at high angle Packet boundaries and Bain group boundaries, with secondary nucleation observed at specific low-angle grain boundaries (LAGBs) under varied heating rates. Elevated heating rates amplify nucleation density across high-angle variant pairs (V1/V2, V1/V3&5, V1/V6) and low-angle pairs (V1/V4, V1/V11&13), which exhibit suppressed activity at 1 °C/s. A significantly higher nucleation efficiency is produced for V1/V2, V1/V6 and V1/V11&13 pairs when the heating rate increases from 17 to 130 °C/s.