The Effect of Cr on Phase Transformation Behavior of Austenite in Fe-20Mn-9Al-1.2C-xCr Low-density Steels During Isothermal Aging

Jianlei Zhang; Yueshan Jiang; Conghui Hu; Gang Ji; Changjiang Song; Qijie Zhai

doi:10.1007/s12540-022-01167-y

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자료유형: 학술저널

저자정보: Jianlei Zhang (Shanghai University) Yueshan Jiang (Shanghai University) Conghui Hu (Shanghai University) Gang Ji (Univ. Lille) Changjiang Song (Shanghai University) Qijie Zhai (Shanghai University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.11

발행연도: 2022.11

수록면: 2,583 - 2,595 (13page)

DOI: 10.1007/s12540-022-01167-y

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The influence of Cr on the microstructural evolution of austenite in Fe-20Mn-9Al-1.2C-xCr (wt%, x = 0, 3 and 6) low-densitysteels during isothermal aging at 650 °C for various durations was systematically investigated. With the isothermal agingprocessed, the 0Cr and 3Cr samples underwent the divorced eutectoid transformation followed by the eutectoid transformation,while only the eutectoid transformation was observed in the 6Cr sample. Meanwhile, increasing Cr content changedthe eutectoid transformation products from ferrite + κ-carbide in the 0Cr sample to ferrite + κ-carbide + M23C6carbide in the3Cr sample, and to ferrite + M7C3carbide in the 6Cr sample. The Cr addition significantly increased the A1 temperature (655°C) of the 0Cr sample to 712 °C of the 3Cr sample, and to 841 °C of the 6Cr sample. As a result, the temperature differencebetween the A1 temperature and experimental phase transformation temperature (650 °C) was enlarged, which provided agreater driving force for the eutectoid transformation and accelerated the transformation rate of eutectoid transformation. Inaddition, the Cr addition had a significant effect on the diffusion of constituent elements, decreased the interlayer spacingof pearlite structure from 625 ± 30 nm in the 0Cr sample to 385 ± 25 nm in the 3Cr sample, and to 150 ± 20 nm in the 6Crsample, refining the eutectoid structure. These findings revealed the mechanism regarding the effect of Cr addition on theeutectoid transformation of austenite, offering valuable insights into the microstructure design of high-performance lowdensitysteels.

#Low-density steel · Cr addition · Eutectoid transformation · Isothermal aging

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