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Effect of Si addition on the microstructure of an Fe-8.0AI-29.0Mn-0.90C alloy

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Abstract

The microstructures of two alloys with Fe-8.0Al-29.0Mn-0.90C, one without Si and one with 1.5 wt pct Si, have been investigated by means of transmission electron microscopy (TEM). In the as-quenched condition, the alloy without Si is single-phase austenite; however, some discrete particles along the austenite grain boundaries can be observed in the Si-bearing alloy. The discrete particles have a mixture of (α + D03) phases, indicating that the Si addition enhances the formation of (α + D03) phases. This result is in disagreement with those reported by other research on Fe-Al-Mn-Si-C alloys. Transmission electron microscopy examinations reveal that the (α + D03) phases are formed by an ordering transition during quenching. When the quenched specimen is aged at temperatures ranging from 450 °C to 1050 °C, the phase transformation sequence occurring within the (α + D03) region as the temperature increases is found to be D03→ (D03 +K phase) → B2 → α.

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Authors and Affiliations

  1. Institute of Materials Science and Engineering National Chiao Tung University, Taiwan, Republic of China

    T. F. Liu (Associate Professor)

  2. Institute of Mechanical Engineering National Chiao Tung University, Taiwan, Republic of China

    J. S. Chou Graduate Student & C. C. Wu Graduate Student

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  1. T. F. Liu
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  2. J. S. Chou Graduate Student
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  3. C. C. Wu Graduate Student
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Liu, T.F., Chou, J.S. & Wu, C.C. Effect of Si addition on the microstructure of an Fe-8.0AI-29.0Mn-0.90C alloy. Metall Trans A 21, 1891–1899 (1990). https://doi.org/10.1007/BF02647237

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  • DOI: https://doi.org/10.1007/BF02647237

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