Effect of Cu contents on aging precipitation behaviors of Cu-rich phase in Fe-Cr-Ni alloy |
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Authors: | TAN Shu-ping WANG Zhen-hua et al |
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Affiliation: | [1]School of Astronautics, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China [2]State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China [3]Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract: | Abstract: The precipitation characteristics and effect on strengthening mechanism of Cu-rich phases during short-time and long-time aging in the Super 304H steels with different Cu contents were investigated by the use of X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The results show that the size of Cu-rich phase particles increases, the distance of Cu-rich phase particles decreases and the density of Cu-rich phases increases with the increase of Cu content during short-time aging (~ 800 h) at 650℃ in the Super 304H steels. During long-time aging (>2000 h) at 650℃, Cu-rich phases precipitate sufficiently and the strengthening effect of Cu-rich phases is preferable in the Super 304H steel with 4% Cu. The strengthening effect of Cu-rich phases in the Super 304H steels with 2.2 % Cu or 5 % Cu is weaker than that with 4% Cu during long-time aging (>2000 h). |
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Keywords: | heat resistant alloy Cu contents Cu-rich phases aging precipitation strengthening |
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