Critical Strain for the Initiation of Dynamic Recrystallization in a Fe-Cr-Ni Super Austenitic Stainless Steel

Chao Bei Hu; Bao Feng Guo; Yong Tao Zhang; Miao Jin; Ming Fang Ma; Guan Qiang Yang

doi:10.4028/www.scientific.net/AMR.952.130

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 952Critical Strain for the Initiation of Dynamic...

Critical Strain for the Initiation of Dynamic Recrystallization in a Fe-Cr-Ni Super Austenitic Stainless Steel

Abstract:

In constant strain rate tests, the occurrence of dynamic recrystallization (DRX) is traditionally identified from the presence of stress peaks in flow curves. However, not all materials display well-defined peaks when tested under these conditions. It is shown that the onset of DRX can also be identified from the inflection point on the strain hardening rate (θ=dσ/dε)versus flow stress (σ) curve. In this paper, the hot compression curves can be described by an equation that fits the experimental θ-σ data from zero to the peak stress. An appropriate third order equation was fitted to the strain hardening data. The results show that the critical stress at initiation σc=-B/3A where A and B are coefficients of the third order equation. It is evident that this value depends on the deformation conditions. The stress–strain curve was then normalized with respect to the peak stress, leading to a normalized value of the critical stress (u_c) equal to uc=σc/σp=-B'/3A'. Here A'and B'are coefficients of the normalized third order equation. This value is constant and independent of the deformation conditions.