Influence of Heat Treatments on Mechanical Behavior of FV520B Steel

Authors

  • J. Fan,

    Corresponding author
    1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, China
    2. Department of Mechanical Engineering, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47906
    • Correspondence

      J. Fan

      State Key Laboratory of Structural Analysis for Industrial Equipment

      Dalian University of Technology

      Dalian 116024

      China

      Email: fanjunling@mail.dlut.edu.cn

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  • X. Guo,

    1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, China
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  • C. Wu,

    1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, China
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  • V. Crupi,

    1. Department of Industrial Chemistry and Materials Engineering, Faculty of Engineering, University of Messina, Messina, Italy
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  • E. Guglielmino

    1. Department of Industrial Chemistry and Materials Engineering, Faculty of Engineering, University of Messina, Messina, Italy
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Abstract

Experimental tests have been carried out in order to investigate the influence of the heat treatments on the microstructures and mechanical properties of FV520B stainless steel. The fatigue strength of the common and heat-treated FV520B steels was rapidly assessed using the lock-in infrared thermographic methodology. Good agreements were achieved between the predicted values and those obtained by the traditional testing procedures. The temperature increments during the fatigue tests were tightly linked with the internal microstructural changes. The features of the fatigue fracture surface were observed by the scanning electron microscope. It is found that the fatigue microcracks were initiated from the corner of the specimen surface. The metallographic analysis shows that the improvement of the mechanical properties of FV520B steel is attributed to the formation of the fine-tempered martensite along with the secondary phase particles uniformly distributed at the grain boundary.

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