Investigation on the High-Temperature Deformation and Dynamic Recrystallization Behavior of CF170 Maraging Stainless Steel

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  • Ma Jian
    Metallurgical Technology Institute, Central Iron and Steel Research Institute
  • Gao Qi
    Research Institute of Special Steels, Central Iron and Steel Research Institute
  • Zhang Hongliang
    Metallurgical Technology Institute, Central Iron and Steel Research Institute
  • Wang Baoshan
    Metallurgical Technology Institute, Central Iron and Steel Research Institute
  • Feng Guanghong
    Metallurgical Technology Institute, Central Iron and Steel Research Institute

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Description

<p>Under the conditions of deformation temperature of 900∼1200°C and strain rate of 0.01∼10 s−1, the single pass isothermal compression test of CF170 maraging stainless steel was carried out on the Gleeble-3800 thermal compression simulator, and its flow stress curve was measured. Based on the Arrhenius model and Avrami model, the flow stress model considering strain compensation and dynamic recrystallization volume fraction model were established according to the flow stress curve. The results showed that the dynamic recrystallization of CF170 steel occurs in advance compared with other steels, and the relationship between the critical strain of dynamic recrystallization and the peak strain is εc = 0.44 εp. CF170 steel is sensitive to the deformation temperature and strain rate. The temperature required for complete dynamic recrystallization is relatively low at a low strain rate. In addition, although the flow stress curve does not show the characteristics of dynamic recrystallization under the high temperature and high strain rate, partial dynamic recrystallization still occurs. In addition, the hierarchical relationship between the martensite and austenite was analyzed by Electron Back-Scattered Diffraction. The results showed that a prior austenite grain is divided into multiple martensite packets, subsequently a packet is divided into several martensite blocks.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 63 (11), 1533-1540, 2022-11-01

    The Japan Institute of Metals and Materials

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