Study of fatigue crack growth rate for austenitic Fe-Al-Mn alloys |
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| Authors: | Y. -P. Chang S. -C. Lee G. -H. Tang |
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| Affiliation: | (1) Department of Mechanical Engineering, Tatung Institute of Technology, Taipei, Taiwan;(2) Department of Materials Engineering, Tatung Institute of Technology, Taipei, Taiwan;(3) Center for Aviation & Space Technology, Industrial Technology Research Institute, Hsinchu, Taiwan |
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| Abstract: | A study was made of the crack growth rate (da/dN) versus stress-intensity variation ΔK behavior of Fe-Al-Mn alloys with different percentages of carbon, aluminum, and manganese at ambient temperature. The experimental results are described with respect to a Paris equation,da/dN = C(†K)n, where the exponent n, index for crack growth resistance of materials, was strongly influenced by alloy composition. It was found that higher manganese content provided better crack growth resistance, and that carbon and aluminum had an opposite effect. Scanning electron microscopy, x-ray diffraction, and mechanical properties evaluation were performed and correlated to the change of n values. |
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| Keywords: | crack growth rate Fe-Al-Mn alloy n value Paris equation |
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