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<p>A 0.06C-9Mn steel was fabricated by replacing all Ni with Mn with Ref erence to the chemical composition of 9Ni steel. The steel was subjected to hot rolling and warm rolling processes combined with different intercritical annealing temperatures. The microstructure evolution and mechanical properties of 0.06C-9Mn steel with various austenitic characteristics were analyzed by EBSD, XRD, TEM and in-situ magnetic induction measurements. The results indicated that the main phase compositions of hot-rolled steel and warm-rolled steel were approximately the same and the <i>ε</i>-martensite could be observed in the microstructure. The microstructure of the warm rolled steel after intercritical annealing at 630&#xa0;°C for 1h exhibited a mixture of lath and equiaxed morphology, with the volume fraction of austenite close to 50% and exhibiting a moderate austenite stability. This characteristic promoted the generation of a relatively sufficient transformation-induced plasticity effect, which in turn resulted in superior tensile properties. The appropriate proportion and stability of austenite are pivotal factors determining the low-temperature impact toughness. However, the transformation amount of austenite does not show a direct proportionality to the impact toughness. Moreover, the grain size exerts a more significant influence than the morphology.</p>

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Effect of the Rolling Process and Intercritical Annealing Temperature on the Mechanical Behavior of 0.06C-9Mn Steel

  • 期刊论文

  • 发表日期：

    2025年6月10日

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  • Chengcheng Yu,
  • Qiannan Zhen,
  • Chengsi Zheng,
  • Yuehua Sun,
  • Mingya Zhang,
  • Shilei Li

摘要

A 0.06C-9Mn steel was fabricated by replacing all Ni with Mn with Ref erence to the chemical composition of 9Ni steel. The steel was subjected to hot rolling and warm rolling processes combined with different intercritical annealing temperatures. The microstructure evolution and mechanical properties of 0.06C-9Mn steel with various austenitic characteristics were analyzed by EBSD, XRD, TEM and in-situ magnetic induction measurements. The results indicated that the main phase compositions of hot-rolled steel and warm-rolled steel were approximately the same and the ε-martensite could be observed in the microstructure. The microstructure of the warm rolled steel after intercritical annealing at 630 °C for 1h exhibited a mixture of lath and equiaxed morphology, with the volume fraction of austenite close to 50% and exhibiting a moderate austenite stability. This characteristic promoted the generation of a relatively sufficient transformation-induced plasticity effect, which in turn resulted in superior tensile properties. The appropriate proportion and stability of austenite are pivotal factors determining the low-temperature impact toughness. However, the transformation amount of austenite does not show a direct proportionality to the impact toughness. Moreover, the grain size exerts a more significant influence than the morphology.