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Effect of thermomechanical processing parameters on the final microstructure of pipeline steels

(2010) Materials Science Forum. 638-642. p.3068-3073
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Abstract
The phase transformation and the final microstructure were studied in a pipeline steel grade API-X80 by carrying out a number of physical simulations of the industrial hot rolling schedules. The deformation and the cooling parameters were simulated by means of hot torsion and dilatometry experiments. Torsion deformations in the same range as in the hot rolling schedule were applied in a multi-deformation cycle at various temperatures in the austenite region. Subsequently the following parameters were varied with respect to a reference status: the reheating temperature from 900 to 1200 degrees C, the deformation step from 0.6 to 0.15 von Misses strain, the strain rate from 1 to 10 s(-1), the inter-pass time from 0.4 to 2 s, the deformation temperature from 1,100 to 850 degrees C, the cooling rate from 0.1 to 100 degrees C/s and the cooling stop temperature from 650 to 25 degrees C. The transformation product microstructures were observed with optical microscopy, scanning electron microscopy and electron backscatter diffraction. The experimental data were used to study the microstructure evolution of none-deformed austenite and highly deformed austenite (Von Misses strain of 3.2), and the corresponding CCT diagrams were constructed. The detailed microstructure characteristics obtained from the present work as well as the data from the CCT diagrams for undeformed and deformed austenite could be used to optimize the mechanical properties, strength and toughness of pipeline steel grades by thermo-mechanical control process.
Keywords
Thermomechanical processing, ANISOTROPY, TEMPERATURE, reheating temperature, transformation, deformation, cooling, TEXTURE DEVELOPMENT, austenite and bainite, HIGH-STRENGTH LINEPIPE, TOUGHNESS, MECHANICAL-PROPERTIES

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MLA
Sanchez Mouriño, Nuria, et al. “Effect of Thermomechanical Processing Parameters on the Final Microstructure of Pipeline Steels.” Materials Science Forum, edited by T Chandra et al., vol. 638–642, Trans Tech, 2010, pp. 3068–73, doi:10.4028/www.scientific.net/MSF.638-642.3068.
APA
Sanchez Mouriño, N., Petrov, R., Bae, J., Kim, K., & Kestens, L. (2010). Effect of thermomechanical processing parameters on the final microstructure of pipeline steels. In T. Chandra, N. Wanderka, W. Reimers, & M. Ionescu (Eds.), Materials Science Forum (Vol. 638–642, pp. 3068–3073). https://doi.org/10.4028/www.scientific.net/MSF.638-642.3068
Chicago author-date
Sanchez Mouriño, Nuria, Roumen Petrov, Jin-ho Bae, Kisso Kim, and Leo Kestens. 2010. “Effect of Thermomechanical Processing Parameters on the Final Microstructure of Pipeline Steels.” In Materials Science Forum, edited by T Chandra, N Wanderka, W Reimers, and M Ionescu, 638–642:3068–73. Stafa-Zürich, Switzerland: Trans Tech. https://doi.org/10.4028/www.scientific.net/MSF.638-642.3068.
Chicago author-date (all authors)
Sanchez Mouriño, Nuria, Roumen Petrov, Jin-ho Bae, Kisso Kim, and Leo Kestens. 2010. “Effect of Thermomechanical Processing Parameters on the Final Microstructure of Pipeline Steels.” In Materials Science Forum, ed by. T Chandra, N Wanderka, W Reimers, and M Ionescu, 638–642:3068–3073. Stafa-Zürich, Switzerland: Trans Tech. doi:10.4028/www.scientific.net/MSF.638-642.3068.
Vancouver
1.
Sanchez Mouriño N, Petrov R, Bae J, Kim K, Kestens L. Effect of thermomechanical processing parameters on the final microstructure of pipeline steels. In: Chandra T, Wanderka N, Reimers W, Ionescu M, editors. Materials Science Forum. Stafa-Zürich, Switzerland: Trans Tech; 2010. p. 3068–73.
IEEE
[1]
N. Sanchez Mouriño, R. Petrov, J. Bae, K. Kim, and L. Kestens, “Effect of thermomechanical processing parameters on the final microstructure of pipeline steels,” in Materials Science Forum, Berlin, Germany, 2010, vol. 638–642, pp. 3068–3073.
@inproceedings{996976,
  abstract     = {{The phase transformation and the final microstructure were studied in a pipeline steel grade API-X80 by carrying out a number of physical simulations of the industrial hot rolling schedules. The deformation and the cooling parameters were simulated by means of hot torsion and dilatometry experiments. Torsion deformations in the same range as in the hot rolling schedule were applied in a multi-deformation cycle at various temperatures in the austenite region. Subsequently the following parameters were varied with respect to a reference status: the reheating temperature from 900 to 1200 degrees C, the deformation step from 0.6 to 0.15 von Misses strain, the strain rate from 1 to 10 s(-1), the inter-pass time from 0.4 to 2 s, the deformation temperature from 1,100 to 850 degrees C, the cooling rate from 0.1 to 100 degrees C/s and the cooling stop temperature from 650 to 25 degrees C. The transformation product microstructures were observed with optical microscopy, scanning electron microscopy and electron backscatter diffraction.
The experimental data were used to study the microstructure evolution of none-deformed austenite and highly deformed austenite (Von Misses strain of 3.2), and the corresponding CCT diagrams were constructed. The detailed microstructure characteristics obtained from the present work as well as the data from the CCT diagrams for undeformed and deformed austenite could be used to optimize the mechanical properties, strength and toughness of pipeline steel grades by thermo-mechanical control process.}},
  author       = {{Sanchez Mouriño, Nuria and Petrov, Roumen and Bae, Jin-ho and Kim, Kisso and Kestens, Leo}},
  booktitle    = {{Materials Science Forum}},
  editor       = {{Chandra, T and Wanderka, N and Reimers, W and Ionescu, M}},
  issn         = {{0255-5476}},
  keywords     = {{Thermomechanical processing,ANISOTROPY,TEMPERATURE,reheating temperature,transformation,deformation,cooling,TEXTURE DEVELOPMENT,austenite and bainite,HIGH-STRENGTH LINEPIPE,TOUGHNESS,MECHANICAL-PROPERTIES}},
  language     = {{eng}},
  location     = {{Berlin, Germany}},
  pages        = {{3068--3073}},
  publisher    = {{Trans Tech}},
  title        = {{Effect of thermomechanical processing parameters on the final microstructure of pipeline steels}},
  url          = {{http://doi.org/10.4028/www.scientific.net/MSF.638-642.3068}},
  volume       = {{638-642}},
  year         = {{2010}},
}

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