Rapidly solidified MC carbide morphologies of a laser-glazed single-crystal nickel-base superalloy
Rapidly solidified MC carbide morphologies of a laser-glazed single-crystal nickel-base superalloy
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DOI：
10.1016/0921-5093(92)90421-v
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发表时间：
1992-08
期刊：
影响因子：
6.4
通讯作者：
H. M. Wang;J. H. Zhang;Y. J. Tang;Z. Hu;N. Yukawa;M. Morinaga;Y. Murata
中科院分区：
文献类型：
--
作者：
H. M. Wang;J. H. Zhang;Y. J. Tang;Z. Hu;N. Yukawa;M. Morinaga;Y. Murata
对激光上釉耐热腐蚀单晶镍基高温合金的快速凝固MC （TiC）型碳化物形态及其随凝固冷却速度的变化进行了全面研究。快速凝固的枝晶间MC碳化物呈花状或放射状分支形态，与凝固冷却速度密切相关。在相对较低的冷却速率下（9 × 103K s−1），碳化物呈花状形态，其中一些厚板从中心核径向生长。随着冷却速率的增加，菌落的生长形态由花状到径向枝状，再到发育良好的径向分枝菌落。快速凝固的MC碳化物的生长机制是由生长界面上的突起或台阶向外横向生长。发育良好的高分支碳化物的分支发生在孪晶或孪晶交叉处。
Rapidly solidified MC (TiC type) carbide morphology and its evolution with solidification cooling rate were studied comprehensively for a laser-glazed hot-corrosion resistant single-crystal nickel-base superalloy. The rapidly solidified interdendritic MC carbide was found in flower-like or radially branching morphologies which are closely related to the solidification cooling rate. At a relatively low cooling rate (9 × 103K s−1), the carbide takes up the flower-like morphology, in which a few thick plates grow radially from the central nucleus. As the cooling rate increases, the growth morphology changes from flower like to radially dendritic and finally to well-developed radially branching colonies. The growth mechanism of the rapidly solidified MC carbide was to be lateral growth from the ledges or steps existing on the growing interface. The branching of the well-developed highly branching carbide occurs from the twins or twin intersections on the advancing fronts.