摘要
单晶高温合金具有优异的高温力学性能。本文着重介绍单晶高温合金的非平衡凝固方面的部分有趣的研究结果:包括固液界面的形态选择,从而提示如何合适控制定向凝固工艺参数;在大温度梯度下和在侧向约束条件下的定向凝固,首次发现存在一个无(γ+γ′)共晶区和TiC的上浮现象;在加快冷却速度时,还发现从未报导过的TiC的奇异形态以及其它一些亚稳相。
Single crystal superalloys possess supreme quality of high temperature mechanical properties. Some interesting research results on the nonequilibrium solidification of single crystal Ni-base superalloys have been mainly introduced, including the morphology selection of solid / liquid interface, which guides us to appropriately control the processing parameters of directional solidification; the directional solidification under high thermal gradient as well as under lateral constraint, in which a (γ+-γ′) eutectic-free zone and the floatation of TiC particles upwards are firstly found; the discovery of peculiar morphology of TiC and some metastable phases during rapid solidification is also reported.
出处
《腐蚀科学与防护技术》
CAS
CSCD
1993年第1期15-22,共8页
Corrosion Science and Protection Technology
基金
国家自然科学基金
中国科学院金属研究所快速凝固非平衡材料国家实验室资助
关键词
单品高温合金
定向凝固
非平衡凝固
single crystal superalloy
directional solidification
nonequilibrium solidification
