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Effect of Boron on the Hot Ductility Behavior of a Low Carbon Advanced Ultra-High Strength Steel (A-UHSS)

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Abstract

This research work studied the effect of boron additions (14, 33, 82, 126, and 214 ppm) on the hot ductility behavior of a low carbon advanced ultra-high strength steel. For this purpose, specimens were subjected to a hot tensile test at different temperatures [923 K, 973 K, 1023 K, 1073 K, 1173 K, and 1273 K (650 °C, 700 °C, 750 °C, 800 °C, 900 °C, and 1000 °C)] under a constant true strain rate of 10−3 s−1. The reduction of area (RA) of the tested samples until fracture was taken as a measure of the hot ductility. In general, results revealed a marked improvement in hot ductility from 82 ppm B when the stoichiometric composition for BN (0.8:1) was exceeded. By comparing the ductility curve of the steel with the highest boron content (B5, 214 ppm B) and the curve for the steel without boron (B0), the increase of hot ductility in terms of RA is over 100 pct. In contrast, the typical recovery of hot ductility at temperatures below the Ar3, where large amounts of normal transformation ferrite usually form in the structure, was not observed in these steels. On the other hand, the fracture surfaces indicated that the fracture mode tends to be more ductile as the boron content increases. It was shown that precipitates and/or inclusions coupled with voids play a meaningful role on the crack nucleation mechanism, which in turn causes hot ductility loss. In general, results are discussed in terms of boron segregation and precipitation on austenitic grain boundaries during cooling from the austenitic range and subsequent plastic deformation.

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Acknowledgments

I. Mejía and G. Altamirano would like to thank CONACYT (México) for the support during this project. All the authors also acknowledge the Departament de Ciència dels Materials i Enginyeria Metal lúrgica of the Universitat Politécnica de Catalunya (UPC-Spain) for the support and technical assistance in this research work, especially Dr. Ahmed Boulaajaj. Funding was obtained through Project CICYT-MAT2008-06793-C02-01 (Spain) and Coordinación de la Investigación Científica of the Universidad Michoacana de San Nicolás de Hidalgo (UMSNH-México).

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Authors and Affiliations

  1. Instituto de Investigaciones Metalúrgicas – Universidad Michoacana de San Nicolás de Hidalgo, Edificio “U-5”, Ciudad Universitaria, 58066, Morelia, Mich., Mexico

    Ignacio Mejía (Professor and Researcher), Gerardo Altamirano (Ph.D. Student) & Arnoldo Bedolla-Jacuinde (Professor and Researcher)

  2. Departament de Ciència dels Materials i Enginyeria Metal lúrgica, ETSEIB – Universitat Politècnica de Catalunya, Av. Diagonal 647, 08028, Barcelona, Spain

    José María Cabrera (Professor and Researcher)

  3. Fundació CTM Centre Tecnològic, Av. de las Bases de Manresa, 1, 08240, Manresa, Spain

    José María Cabrera (Professor and Researcher)

Authors
  1. Ignacio Mejía
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  2. Gerardo Altamirano
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  3. Arnoldo Bedolla-Jacuinde
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  4. José María Cabrera
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Correspondence to Ignacio Mejía.

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Manuscript submitted April 2, 2012.

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Mejía, I., Altamirano, G., Bedolla-Jacuinde, A. et al. Effect of Boron on the Hot Ductility Behavior of a Low Carbon Advanced Ultra-High Strength Steel (A-UHSS). Metall Mater Trans A 44, 5165–5176 (2013). https://doi.org/10.1007/s11661-013-1870-0

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