Experimental study of type 316 stainless steel failure under LCF/TMF loading conditions |
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| Affiliation: | 1. Department of Mechanical Engineering, University of Bristol, BS8 1TR, UK;2. EDF Energy plc, Barnett Way, Barnwood, Gloucester GL 3RS, UK;1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300072, China;3. School of Materials Science and Engineering, Tianjin University of Technology, Tianjin;1. Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India;2. Dept. of Metallurgical & Materials Engg., Indian Institute of Technology Madras, Chennai 600036, India |
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| Abstract: | A detailed investigation of low cycle fatigue (LCF) and thermo-mechanical fatigue (TMF) of a 316FR type stainless steel is presented in this paper in order to identify the failure mechanism based on the experimental results and the subsequent metallography of the samples. The LCF–TMF servohydraulic testing with a temperature uniformity of less than ±5 °C within the gauge section of the specimens was employed to conduct the experimental tests. Fully-reversed, strain-controlled isothermal tests were conducted at 650 °C for the strain ranges of Δ? = ±0.4%, ±0.8%, ±1.0% and ±1.2%. Strain-controlled in-phase (IP) thermo-mechanical fatigue tests were conducted on the same material and the temperature was cycled between 500 °C and 650 °C. Additionally, the creep–fatigue interactions were investigated with the introduction of symmetrical hold time under both LCF–TMF tests. The cyclic behaviour was further studied by performing microstructural investigations using the scanning electron microscope (SEM). |
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| Keywords: | Low cycle fatigue Thermo mechanical fatigue Cyclic deformation behaviour Creep–fatigue interaction Hysteresis stress strain energy |
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