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This work investigates the microstructuralMicrostructural features of additively manufactured 420 stainless steel420 stainless steel (AM420SS) through hot compressive deformation at varying strain rates of 0.01–1.0 s⁻1 under isothermal temperatureTemperature below Ae1 (i.e., single BCC/BCT phase region). The microstructuresMicrostructure are analyzed using electron backscatter diffraction (EBSD) maps in both the as-printed and as-deformed conditions. Flow stress analysis reveals that the significant softening observed at 700 °C is due to grain distortionGrain fracturing. The high dislocation densityDensity generated during deformation is absorbed by the grains, leading to intensive rotation and resulting in poor reconstruction of the parent austenite microstructureMicrostructure. These findings provide a deeper understanding of the hot deformationHot deformation mechanisms in AM420SS and will aid in developing high temperatureHigh temperature post-processing techniques after additive manufacturingAdditive manufacturing, particularly on the effects of strain rate and temperatureTemperature on grain stability and microstructuralMicrostructural evolution.

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Microstructural Features of Additively Manufactured 420 Stainless Steel After Isothermal Deformation Below the Ae1 Temperature

  • 会议论文

  • 发表日期：

    2025年

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  • Harveen Bongao,
  • Jubert Pasco,
  • Kudakwashe Nyamuchiwa,
  • Clodualdo Aranas

摘要

This work investigates the microstructuralMicrostructural features of additively manufactured 420 stainless steel420 stainless steel (AM420SS) through hot compressive deformation at varying strain rates of 0.01–1.0 s⁻1 under isothermal temperatureTemperature below Ae1 (i.e., single BCC/BCT phase region). The microstructuresMicrostructure are analyzed using electron backscatter diffraction (EBSD) maps in both the as-printed and as-deformed conditions. Flow stress analysis reveals that the significant softening observed at 700 °C is due to grain distortionGrain fracturing. The high dislocation densityDensity generated during deformation is absorbed by the grains, leading to intensive rotation and resulting in poor reconstruction of the parent austenite microstructureMicrostructure. These findings provide a deeper understanding of the hot deformationHot deformation mechanisms in AM420SS and will aid in developing high temperatureHigh temperature post-processing techniques after additive manufacturingAdditive manufacturing, particularly on the effects of strain rate and temperatureTemperature on grain stability and microstructuralMicrostructural evolution.