Constitutive modeling, microstructure evolution, and processing map for a nitride-strengthened heat-resistant steel

Wen-Feng Zhang, Wei Sha, Wei Yan, Wei Wang, Yiyin Shan, Ke Yang

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    Abstract

    A constitutive equation was established to describe the deformation behavior of a nitride-strengthened (NS) steel through isothermal compression simulation test. All the parameters in the constitutive equation including the constant and the activation energy were precisely calculated for the NS steel. The result also showed that from the stress-strain curves, there existed two different linear relationships between critical stress and critical strain in the NS steel due to the augmentation of auxiliary softening effect of the dynamic strain-induced transformation. In the calculation of processing maps, with the change of Zener-Hollomon value, three domains of different levels of workability were found, namely excellent workability region with equiaxed-grain microstructure, good workability region with “stripe” microstructure, and the poor workability region with martensitic-ferritic blend microstructure. With the increase of strain, the poor workability region first expanded, then shrank to barely existing, but appeared again at the strain of 0.6.
    Original languageEnglish
    Pages (from-to)3042-3050
    Number of pages9
    JournalJournal of Materials Engineering and Performance
    Volume23
    Issue number8
    Early online date13 May 2014
    DOIs
    Publication statusPublished - Aug 2014

    Keywords

    • light microscopy
    • Mechanical Characterization
    • Martensite
    • Recrystallization
    • steel
    • Thermomechanical processing

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