Hot deformation characteristics of a nitride strengthened martensitic heat resistant steel

Wen-Feng Zhang, Xiao-Li Li, Wei Sha, Wei Yan, Wei Wang, Yi-yin Shan, Ke Yang

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    Abstract

    Constitutive equations including an Arrhenius term have been applied to analyze the hot deformation behavior of a nitride-strengthened (NS) martensitic heat resistant steel in temperature range of 900–1200 °C and strain rate range of 0.001–10 /s. On the basis of analysis of the deformation data, the stress–strain curves up to the peak were divided into four regions, in sequence, representing four processes, namely hardening, dynamic recovery (DRV), dynamic strain induced transformation (DSIT), and dynamic recrystallization (DRX), according to the inflection points in ∂θ/∂σ∂θ/∂σ and ∂(∂θ/∂σ)/∂σ∂(∂θ/∂σ)/∂σ curves. Some of the inflection points have their own meanings. For examples, the minimum of ∂θ/∂σ∂θ/∂σ locates the start of DRV and the maximum of it indicates the start of DRX. The results also showed that the critical strain of DRX was sensitive to ln(Z) below 40, while the critical stress of DRX was sensitive to it above 40. The final microstructures under different deformation conditions were analyzed in terms of softening processes including DRV, DRX, metadynamic crystallization (MDRX) and DSIT.
    Original languageEnglish
    Pages (from-to)199-208
    Number of pages10
    JournalMaterials Science and Engineering A
    Volume590
    Early online date22 Oct 2013
    DOIs
    Publication statusPublished - 10 Jan 2014

    Keywords

    • steel
    • Mechanical Characterization
    • Martensite
    • Thermomechanical processing
    • Recrystallization
    • Phase transformation

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