Spark plasma sintering cobalt base superalloy strengthened by Y–Cr–O compound through high-energy milling
Spark plasma sintering cobalt base superalloy strengthened by Y–Cr–O compound through high-energy milling
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DOI：
10.1016/j.jmatprotec.2007.10.084
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发表时间：
2008-08
影响因子：
6.3
通讯作者：
C. Tang;F. Pan;X. Qu;C. Jia;Baihua Duan;X. He
中科院分区：
文献类型：
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作者：
C. Tang;F. Pan;X. Qu;C. Jia;Baihua Duan;X. He
对高能球磨放电等离子烧结法制备的粉末钴基高温合金进行了金相和压缩试验研究。实验结果表明，随着球磨时间的延长，粉末粒度减小，晶粒度减小，晶格畸变增大。球磨8h后，上述趋势减缓。添加1.5%的甲醇可以减少粉末的粘附和团聚。在1100°C和40 MPa下放电等离子烧结，烧结体的相对密度为99.2%。其显微组织细小，平均晶粒尺寸在5μm以下。其抗压强度为2506 MPa，伸长率为2.5%。1300°C退火热处理可提高其延伸率，但降低其强度。分别为23.0%和1982 MPa。纳米Y2 O3的加入使其转变为Y-Cr-O化合物，起到强化钴基高温合金的作用。
Powder cobalt base superalloy prepared by high-energy balling and spark plasma sintering are studied through metallography and compression test. The experimental results shows that the powder size and crystalline grain decrease and distortions of crystal lattice increases with milling time. These trends slow down after milling for 8h. Addition of 1.5% methanol can lessen powders adherence and agglomeration. The relative density of the sintered compact is 99.2% by spark plasma sintering at 1100°C and 40MPa. Its microstructure is fine with average grain size below 5μm. Its compression strength and elongation are 2506MPa and 2.5%. Annealing heat treatment at 1300°C can improve its elongation but decrease its strength. They are 23.0% and 1982MPa, respectively. The added nano-particles Y2O3are changed into Y–Cr–O compounds to strengthen the cobalt base superalloy.