Novel cobalt base superalloy and its high-temperature flow behavior
来源期刊：Rare Metals2008年第3期
论文作者：TANG Chunfeng~(a,b) PAN Feng~a QU Xuanhui~b DUAN Baihua~b WANG Tianjian~b HE Xinbo~b ~a Laboratory of Advanced Materials,Department of Materials Science and Engineering,Tsinghua University Beijing ,China ~b School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing ,China
文章页码：292 - 298
摘 要：<正>A novel cobalt base superalloy containing titanium and aluminum was investigated through metallography,tensile test,and high-temperature isothermal compression deformation.The results show that proper content of titanium and aluminum with can improve the strength and duc- tility of the cobalt base superalloy.The Co3（Ti,Al）compound with L12 structure precipitates when the novel superalloy is aged at 800℃for 20 h.Theεphase with hcp structure also precipitates when the superalloy is deformed by 28% and then aged at 650℃for 4 h.Theεphase can exist at 800℃.The superalloy has excellent high-temperature mechanical properties.Its maximum flow stress at 850℃is in the range of 360-475 MPa when the strain rate is between 0.0021 and 2.1 s-1.The flow stress of the superalloy during high-temperature deformation can be described by the Zener-Hollomon parameter with a hot deformation activation energy of 397 kJ·mol-1.
摘要：<正>A novel cobalt base superalloy containing titanium and aluminum was investigated through metallography,tensile test,and high-temperature isothermal compression deformation.The results show that proper content of titanium and aluminum with can improve the strength and duc- tility of the cobalt base superalloy.The Co3（Ti,Al）compound with L12 structure precipitates when the novel superalloy is aged at 800℃for 20 h.Theεphase with hcp structure also precipitates when the superalloy is deformed by 28% and then aged at 650℃for 4 h.Theεphase can exist at 800℃.The superalloy has excellent high-temperature mechanical properties.Its maximum flow stress at 850℃is in the range of 360-475 MPa when the strain rate is between 0.0021 and 2.1 s-1.The flow stress of the superalloy during high-temperature deformation can be described by the Zener-Hollomon parameter with a hot deformation activation energy of 397 kJ·mol-1.
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