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Effect of Cu Content on Aging Precipitation Behaviors of Cu-Rich Phase in Fe-Cr-Ni Alloy |
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| Authors: | TAN Shu-ping WANG Zhen-hua CHENG Shi-chang LIU Zheng-dong HAN Jie-cai FU Wan-tang |
| 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 |
| Abstract: | The precipitation characteristics and effect on strengthening mechanism of Cu-rich phases during short-time and long-time aging for Super 304 H steels with different Cu content were investigated using X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that the size of Cu-rich phase particles increases, the interspace of Cu-rich phase particles decreases and the density of Cu-rich phases increases with the increase of Cu content during short-time aging (approximately 800 h) at 650℃ for Super 304H steels. During long-time aging (more than 2 000 h) at 650 ℃, Cu-rich phase precipitates sufficiently and the strengthening effect of Cu-rich phase is preferable in Super 304H steel containing Cu of 4%. The strengthening effect of Cu-rich phase in Super 304H steels containing Cu of 2.2% or 5% is weaker than that with Cu of 4% during long-time aging (more than 2000 h). |
| Keywords: | heat resistant alloy Cu content) Cu-rich phase aging precipitation strengthening |
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