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Optimization of cold and warm workability in 304 stainless steel using instability maps

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Abstract

The deformation characteristics of stainless steel type AISI 304 under compression in the temperature range 20 °C to 600 °C and strain-rate range 0.001 to 100 s-1 have been studied with a view to characterizing the flow instabilities occurring in the microstructure. At strain rates less than 5 s-1, 304 stainless steel exhibits flow localization, whereas dynamic strain aging occurs at intermediate temperatures and below 0.5 s-1. At room temperatures and strain rates less than 10 s-1, martensite formation is observed. To avoid the preceding microstructural instabilities, cold and warm working should be carried out at strain rates greater than 5 s-1. The continuum criterion, developed on the basis of the principles of maximum rate of entropy production and separability of the dissipation function, predicts accurately all the preceding instability features.

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Authors and Affiliations

  1. NRC-USAF Resident Research Associate, Materials Process Design, Materials Directorate, Wright Laboratory, Wright Patterson Air Force Base, 45433-7746, OH

    S. Venugopal

  2. Materials Development Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India

    S. L. Mannan (Head)

  3. Department of Metallurgy, Indian Institute of Science, 560 012, Bangalore, India

    Y. V. R. K. Prasad (Chairman)

Authors
  1. S. Venugopal
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  2. S. L. Mannan
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  3. Y. V. R. K. Prasad
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S. VENUGOPAL, Scientific Officer, on leave from the Materials Development Division, Indira Gandhi Centre for Atomic Research

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Venugopal, S., Mannan, S.L. & Prasad, Y.V.R.K. Optimization of cold and warm workability in 304 stainless steel using instability maps. Metall Mater Trans A 27, 119–126 (1996). https://doi.org/10.1007/BF02647752

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  • DOI: https://doi.org/10.1007/BF02647752

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