Effect of Magnesium and Cerium Microelement on Microstructures and Mechanical Properties of K465 Nickel-Base Superalloy
0.02％ (mass fraction) Mg and 0.02％ Ce were added into nickel-base superalloy, K465, in order to study their effect on microstructures and mechanical properties. The results showed that without addition of Mg and Ce, the grain boundaries was flat, the MC carbide precipitate was noncontinuous with particle shape. With 0.02％ Mg addition the MC carbide tended to have tiny granular and blocky morphology, while it had a cursive script-like morphology with 0.02％ Ce addition. It was also shown that without any addition of Mg and Ce, the room temperature properties, average tensile strength (σb) and yield strength (σ0.2) were 960 and 790MPa, the creep rupture life under the condition of 1248 K, 230MPa was 28.1h. With the addition of 0.02％ Mg, the room temperature properties, average tensile strength and yield strength had a certain enhancement, the creep rupture life (1248K, 230MPa) was up to 66.7h. When the Ce addition was 0.02％, average tensile strength and yield strength were up to 1020~1030 MPa and 855~885 MPa, respectively, but the average elongation percentage fell down to 3.0％, only reaching the required value. The most expressive thing was that the creep rupture life (1248K, 230MPa) was only 17.25~18.77h, far below the required value.
cast superalloy trace element microstructure mechanical properties rare earths
Pei Zhongye(裴忠冶) Li Juntao(李俊涛) Zhao Minghan(赵明汉) Han Muyao(韩牧遥) Zhou Zhihua(周志华) Tian Yanwen(田彦文)
School of Material & Metallurgy, Northeastern University, Shenyang 110004,China High Teraperature Ma High Teraperature Materials Research Institute, Central Iron and Steel Research Institute, Beijing 1 School of Material & Metallurgy, Northeastern University, Shenyang 110004, China
国际会议
第五届国际稀土开发与应用研讨会(The Fifth International Conference on Rare Earth Decelopment and Applicatin)
包头
英文
373-376
2007-08-07（万方平台首次上网日期，不代表论文的发表时间）