The Study of Phase Transformation Behaviors for 38MnB5Nb Ultra High-Strength Steel by CCT Curves and TTT Curves

نویسندگان

چکیده

To elucidate the phase transformation behaviors for 38MnB5Nb ultra high-strength steel, continuous cooling (CCT) and time-temperature-transformation (TTT) curves were determined by thermal expansion method with different rates isothermal temperatures after complete austenization. be more accurate, microstructure was observed hardness tested. The results showed that starting ending of austenite during heating are 748 °C 805 °C, respectively. Bainite’s start temperature is between 540 550 while martensite’s about 310 °C. critical rate 10 °C/s 15 °C/s. microstructures severely related to process process. relationship investigated microstructure. Based on CCT compared conventional 22MnB5 hot stamping studied steel beneficial selective processes.

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ژورنال

عنوان ژورنال: Metals

سال: 2023

ISSN: ['2075-4701']

DOI: https://doi.org/10.3390/met13020190