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Cyclic deformation and phase transformation of 6Mo superaustenitic stainless steel

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Abstract

A fatigue behavior analysis was performed on superaustenitic stainless steel UNS S31254 (Avesta Sheffield 254 SMO), which contains about 6wt.% molybdenum, to examine the cyclic hardening/softening trend, hysteresis loops, the degree of hardening, and fatigue life during cyclic straining in the total strain amplitude range from 0.2 to 1.5%. Independent of strain rate, hardening occurs first, followed by softening. The degree of hardening is dependent on the magnitude of strain amplitude. The cyclic stress-strain curve shows material softening. The lower slope of the degree of hardening versus the strain amplitude curve at a high strain rate is attributed to the fast development of dislocation structures and quick saturation. The ε martensite formation, either in band or sheath form, depending on the strain rate, leads to secondary hardening at the high strain amplitude of 1.5%.

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Taiwan Ocean University, 20224, Keelung, Taiwan

    Shing-Hoa Wang & Chia-Chang Wu

  2. Institute of Materials Science and Engineering, National Taiwan University, 10617, Taipei, Taiwan

    Chih-Yuan Chen & Jer-Ren Yang

  3. Instrument Technology Research Center, National Applied Research Laboratories, 30076, Hsinchu, Taiwan

    Po-Kay Chiu

  4. Outo Kumpu Asia Pacific, 24250, Hsin Chuang, Taiwan

    Jason Fang

Authors
  1. Shing-Hoa Wang
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  2. Chia-Chang Wu
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  3. Chih-Yuan Chen
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  4. Jer-Ren Yang
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  5. Po-Kay Chiu
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  6. Jason Fang
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Correspondence to Shing-Hoa Wang.

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Wang, SH., Wu, CC., Chen, CY. et al. Cyclic deformation and phase transformation of 6Mo superaustenitic stainless steel. Met. Mater. Int. 13, 275–283 (2007). https://doi.org/10.1007/BF03027883

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