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Intercritically annealed and isothermally transformed 0.15 Pct C steels containing 1.2 Pct Si-1.5 Pct Mn and 4 Pct Ni: Part II. effect of testing temperature on stress-strain behavior and deformation-induced austenite transformation

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Abstract

Stress-strain behavior and deformation-induced transformation of retained austenite were studied for intercritically annealed and isothermally transformed Si-Mn and Ni steels as a function of testing temperature between −80 °C and 120 °C. Rapid decrease of retained austenite at small strains dominates at low-temperature testing and in microstructures containing martensite. The austenite transformation in microstructures without martensite shifts to larger strains with increasing testing temperature. The accompanying increase of strain-hardening rates at larger strains deters the onset of necking and improves ductility. The benefits of the austenite transformation lead to a peak in ductility between 20 °C and 70 °C in the Si-Mn steel and at 70 °C in the Ni steel. The peaks are dependent on the nature of the dispersed microconstituents produced in the ferrite during isothermal transformation. Higher testing temperatures enhance the mechanical stability of the austenite and result in lower ductility.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Colorado School of Mines, 80401, Golden, CO

    Yasuharu Sakuma (Visiting Scientist, Senior Researcher), David K. Matlock (Professor) & George Krauss (Professor)

  2. Nippon Steel Corporation, 299-12, Chiba-Ken, Japan

    Yasuharu Sakuma (Visiting Scientist, Senior Researcher)

Authors
  1. Yasuharu Sakuma
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  2. David K. Matlock
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  3. George Krauss
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Sakuma, Y., Matlock, D.K. & Krauss, G. Intercritically annealed and isothermally transformed 0.15 Pct C steels containing 1.2 Pct Si-1.5 Pct Mn and 4 Pct Ni: Part II. effect of testing temperature on stress-strain behavior and deformation-induced austenite transformation. Metall Trans A 23, 1233–1241 (1992). https://doi.org/10.1007/BF02665054

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  • DOI: https://doi.org/10.1007/BF02665054

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