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Strength Improvement of Ferritic/Martensitic T91 Steel by Cross Wedge Rolling at Different Austenitizing Temperatures

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Cross wedge rolling (CWR) is a forming technique wherein the processed material microstructure is controlled by the processing temperature. The initial results on CWR-processed T91 steels at different austenitizing temperatures are discussed with the microstructure analysis by various characterization techniques, such as the optical and scanning electron microscopies. The processed T91 specimens were much harder than water-quenched ones, their hardness being independent of the ausforming temperatures despite their microstructural differences.

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Acknowledgments

This study has been perfomed within framework of the project ZKL-PR-200305 entitled “T91 Shaft Formed by Cross Wedge Rolling,” E3-0507-16-0201-16XKCZ01 entitled “Discipline Construction of Mechanical Engineering” and 16030501200 entitled “Research on Key Technologies of Underwater Vehicles for Deep-sea Oil and Gas Fields.” We wish to thank X. H. Zhang, M. Song, and L. B. Hang for discussions and advice, which resulted in significant improvements. The provision of microscopes at the Microscopy and Imaging Center at Texas A&M University is also gratefully acknowledged.

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Correspondence to T. He.

Additional information

Translated from Problemy Prochnosti, No. 1, pp. 72 – 78, January – February, 2017.

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He, T., Min, L. & Liu, H.J. Strength Improvement of Ferritic/Martensitic T91 Steel by Cross Wedge Rolling at Different Austenitizing Temperatures. Strength Mater 49, 61–66 (2017). https://doi.org/10.1007/s11223-017-9842-z

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Keywords

  • cross wedge rolling
  • ausforming
  • ferritic/martensitic T91 steel
  • deformation