High- temperature fatigue property of 18CrNbTi ferritic stainless steel |
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Authors: | LIU Tian- long CHEN Li- jia BI Hong- yun CHE Xin |
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Affiliation: | 1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China ;2. Research Institute, Baoshan Iron and Steel Co., Ltd., Shanghai 201900, China?? |
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Abstract: | In order to determine the influence of dwell time and atmosphere environment on high- temperature fatigue properties of 18CrNbTi ferritic stainless steel, the high- temperature fatigue behaviors of 18CrNbTi steel with 10s dwell time at maximum stress in argon and simulated automobile exhaust gas were investigated under axial tension- tension stress- controlled mode at 800??, and compared with its high- temperature fatigue behavior in air without dwell time. The fracture surfaces of fatigued specimens were observed with scanning electron microscope. The results show that: the fatigue limit of 18CrNbTi steel in air is 25MPa; the fatigue resistance and fatigue life of 18CrNbTi steel significantly reduce after introducing 10s dwell time; in comparison with those in argon, the fatigue resistance and fatigue life have a further decrease in the simulated automobile exhaust gas; the fatigue cracks both initiate and propagate in a transgranular mode under all testing conditions. |
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Keywords: | ferritic stainless steel high-temperature fatigue fatigue-creep interaction oxidation fatigue fracture |
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