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Effect of ultra-fast heat treatment on the subsequent formation of mixed martensitic/bainitic microstructure with carbides in a CrMo medium Carbon steel

Spyros Papaefthymiou, Alexandros Banis, Marianthi Bouzouni and Roumen Petrov (UGent)
(2019) METALS. 9(3).
Author
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Abstract
The current work focuses on complex multiphase microstructures gained in CrMo medium carbon steel after ultra-fast heat treatment, consisting of heating with heating rate of 300 degrees C/s, 2 s soaking at peak temperature and subsequent quenching. In order to better understand the microstructure evolution and the phenomena that take place during rapid heating, an ultra-fast heated sample was analyzed and compared with a conventionally treated sample with a heating rate of 10 degrees C/s and 360 s soaking. The initial microstructure of both samples consisted of ferrite and spheroidized cementite. The conventional heat treatment results in a fully martensitic microstructure as expected. On the other hand, the ultra-fast heated sample shows significant heterogeneity in the final microstructure. This is a result of insufficient time for cementite dissolution, carbon diffusion and chemical composition homogenization at the austenitization temperature. Its final microstructure consists of undissolved spheroidized cementite, nano-carbides and martensite laths in a ferritic matrix. Based on EBSD and TEM analysis, traces of bainitic ferrite are indicated. The grains and laths sizes observed offer proof that a diffusionless, massive transformation takes place for the austenite formation and growth instead of a diffusion-controlled transformation that occurs on a conventional heat treatment.
Keywords
ultra-fast heating, martensite/bainite, diffusionless transformations, AHSS

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MLA
Papaefthymiou, Spyros, et al. “Effect of Ultra-Fast Heat Treatment on the Subsequent Formation of Mixed Martensitic/Bainitic Microstructure with Carbides in a CrMo Medium Carbon Steel.” METALS, vol. 9, no. 3, 2019, doi:10.3390/met9030312.
APA
Papaefthymiou, S., Banis, A., Bouzouni, M., & Petrov, R. (2019). Effect of ultra-fast heat treatment on the subsequent formation of mixed martensitic/bainitic microstructure with carbides in a CrMo medium Carbon steel. METALS, 9(3). https://doi.org/10.3390/met9030312
Chicago author-date
Papaefthymiou, Spyros, Alexandros Banis, Marianthi Bouzouni, and Roumen Petrov. 2019. “Effect of Ultra-Fast Heat Treatment on the Subsequent Formation of Mixed Martensitic/Bainitic Microstructure with Carbides in a CrMo Medium Carbon Steel.” METALS 9 (3). https://doi.org/10.3390/met9030312.
Chicago author-date (all authors)
Papaefthymiou, Spyros, Alexandros Banis, Marianthi Bouzouni, and Roumen Petrov. 2019. “Effect of Ultra-Fast Heat Treatment on the Subsequent Formation of Mixed Martensitic/Bainitic Microstructure with Carbides in a CrMo Medium Carbon Steel.” METALS 9 (3). doi:10.3390/met9030312.
Vancouver
1.
Papaefthymiou S, Banis A, Bouzouni M, Petrov R. Effect of ultra-fast heat treatment on the subsequent formation of mixed martensitic/bainitic microstructure with carbides in a CrMo medium Carbon steel. METALS. 2019;9(3).
IEEE
[1]
S. Papaefthymiou, A. Banis, M. Bouzouni, and R. Petrov, “Effect of ultra-fast heat treatment on the subsequent formation of mixed martensitic/bainitic microstructure with carbides in a CrMo medium Carbon steel,” METALS, vol. 9, no. 3, 2019.
@article{8620160,
  abstract     = {{The current work focuses on complex multiphase microstructures gained in CrMo medium carbon steel after ultra-fast heat treatment, consisting of heating with heating rate of 300 degrees C/s, 2 s soaking at peak temperature and subsequent quenching. In order to better understand the microstructure evolution and the phenomena that take place during rapid heating, an ultra-fast heated sample was analyzed and compared with a conventionally treated sample with a heating rate of 10 degrees C/s and 360 s soaking. The initial microstructure of both samples consisted of ferrite and spheroidized cementite. The conventional heat treatment results in a fully martensitic microstructure as expected. On the other hand, the ultra-fast heated sample shows significant heterogeneity in the final microstructure. This is a result of insufficient time for cementite dissolution, carbon diffusion and chemical composition homogenization at the austenitization temperature. Its final microstructure consists of undissolved spheroidized cementite, nano-carbides and martensite laths in a ferritic matrix. Based on EBSD and TEM analysis, traces of bainitic ferrite are indicated. The grains and laths sizes observed offer proof that a diffusionless, massive transformation takes place for the austenite formation and growth instead of a diffusion-controlled transformation that occurs on a conventional heat treatment.}},
  articleno    = {{312}},
  author       = {{Papaefthymiou, Spyros and Banis, Alexandros and Bouzouni, Marianthi and Petrov, Roumen}},
  issn         = {{2075-4701}},
  journal      = {{METALS}},
  keywords     = {{ultra-fast heating,martensite/bainite,diffusionless transformations,AHSS}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{14}},
  title        = {{Effect of ultra-fast heat treatment on the subsequent formation of mixed martensitic/bainitic microstructure with carbides in a CrMo medium Carbon steel}},
  url          = {{http://doi.org/10.3390/met9030312}},
  volume       = {{9}},
  year         = {{2019}},
}
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