Influence of heat treatment on the microstructure and mechanical properties of DZ951 alloy
来源期刊：Rare Metals2008年第2期
论文作者：XIA Pengcheng~(a,b) YU Jingjiang~a SUN Xiaofeng~a GUAN Hengrong~a HU Zhuangqi~a ~a Institute of Metal Research,Chinese Academy of Sciences,Shenyang ,China ~b School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdoo ,China
文章页码：216 - 222
摘 要：<正>DZ951 directionally solidified nickel-base superalloy is mainly strengthened byγphase.Regularly aligned cuboidal and bimodalγprecipi- tates were attained by two heat treatments.The effect of microstructure on the mechanical properties of DZ951 alloy has been investigated. The results indicate that MC carbide changes to tittle blocks during aging treatment at 1050℃（HT1）.MC carbide partly degrades into M23C6 and there is a layer ofγaround the carbide during aging treatment at 1150℃（HT2）,which is beneficial to the elongation of DZ951 alloy. Smallγvolume fraction and the uneven deformation structure are contributed to low mechanical properties of the as-cast alloy.HT1 alloy has a better stress rupture life at 1100℃/50 MPa and yield stress at 20℃,800℃and 1100℃,which is attributed to regularly aligned cuboi- dalγphase and even deformation structure.HT2 alloy has a good combination of strength and ductility.This arises from the bimodalγprecipitates and the degeneration of MC carbide.
XIA Pengcheng~(a,b) YU Jingjiang~a SUN Xiaofeng~a GUAN Hengrong~a HU Zhuangqi~a ~a Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China ~b School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdoo 266510,China
摘 要：<正>DZ951 directionally solidified nickel-base superalloy is mainly strengthened byγphase.Regularly aligned cuboidal and bimodalγprecipi- tates were attained by two heat treatments.The effect of microstructure on the mechanical properties of DZ951 alloy has been investigated. The results indicate that MC carbide changes to tittle blocks during aging treatment at 1050℃（HT1）.MC carbide partly degrades into M23C6 and there is a layer ofγaround the carbide during aging treatment at 1150℃（HT2）,which is beneficial to the elongation of DZ951 alloy. Smallγvolume fraction and the uneven deformation structure are contributed to low mechanical properties of the as-cast alloy.HT1 alloy has a better stress rupture life at 1100℃/50 MPa and yield stress at 20℃,800℃and 1100℃,which is attributed to regularly aligned cuboi- dalγphase and even deformation structure.HT2 alloy has a good combination of strength and ductility.This arises from the bimodalγprecipitates and the degeneration of MC carbide.
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