对高温合金单晶选晶生长工艺进行了实验研究， 揭示了螺旋选晶器和缩颈选晶器的选晶原理。 实验结果表明， 在螺旋选晶器中， 晶体横向择优生长与螺旋结构的耦合作用， 形成连续选晶过程， 是螺旋选晶的主要原理， 其选晶作用良好；而在缩颈选晶器中， 几乎只存在单一的机械阻隔选晶行为， 多重缩颈结构对于改善选晶作用并不明显， 选晶效果不好。
The single crystal selection processes of superalloy in the helix selector and thin-neck selector were studied. The results indicate that the main grain selection mechanism of the helix selector is that the easy growth direction of the cubic crystal coupled with the helical structure of the selector. Helix selector combines with the characteristics of thin-neck and angled grain selector in structure. In thin-neck selector， there is only the grain selection function of mechanical restricting， and the design of multiple thin necks is not beneficial to improving the grain selection effect.
参考文献
| [1] | 陈荣章,王罗宝,李建华.铸造高温合金发展的回顾与展望[J].航空材料学报,2000(01):55-61. |
| [2] | Gell M D;Duhl N;Gupta D K et al.Advanced superalloy airfoils[J].Journal of Metals,1987,39(07):11-15. |
| [3] | Higginbotham G J S .From research to cost-effective directional solidification and single-crystal production-an integrated aproach[J].Materials Technology,1986,2(05):442-460. |
| [4] | Tian Baohui;Li Huanxi;Zhang Yonggang;Wang Keguang;Chen Changqi .CONDITIONS FOR THE OCCURRENCE OF SERRATED FLOW IN Al-Li SINGLE CRYSTALS[J].Transactions of Nonferrous Metals Society of China,1996(1):57-61. |
| [5] | Xu Zhengming;Li Jianguo;Fu Hengzhi .Continuous casting technology of single crystal copper rod[J].Transactions of Nonferrous Metals Society of China,1998(2):277-282. |
| [6] | Du Wei;Li Jianguo;Fu Hengzhi .Solidification and microsegregation behaviors of nickel-base single crystal superalloy solidified at medium cooling rate[J].Transactions of Nonferrous Metals Society of China,1998(1):83-87. |
| [7] | SIMS C T;Stoloff N S;Hagel W C.Superalloy Ⅱ[M].New York John Wiley & Sons Interscience Publication,1987:191-193. |
| [8] | 《航空制造工程手册》总编辑委员会.航空制造工程手册[M].北京:航空工业出版社,1994:12. |
| [9] | 何国 .镍基单晶高温合金凝固行为及组织形成控制规律[D].西北工业大学,1994. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%