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Effect of sample diameter on primary and secondary dendrite arm spacings during directional solidification of Pb-26wt.%Bi hypo-peritectic alloyHU Xiaowua,YAN Honga,CHEN Wenjingb,LI Shuangmingc,and FU... Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China摘 要:The microstructure scales of dendrites,such as primary......
: 348-356. [3] FU Heng-zhi, GUO Jing-jie, SU Yan-qing, LIU Lin, XU Da-ming, LI Jin-shan. Directional solidification and lamellar orientation control of TiAl intermetallics [J]. The Chinese Journal... Effect of liquid-liquid structure transition on solidification of Sn-Bi alloys ZU Fang-qiu(祖方遒), ZHOU Bing(周 兵), LI Xian-fen(李先芬), YI Xun(益 汛), CHEN Yi-ping(陈轶平), SUN Qi-qiang (孙其强) College......
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Microstructure evolution of eutectic Nb–24Ti–15Si–4Cr–2Al–2Hf alloy processed by directional solidificationZhen Li,Sai-Nan Yuan,Li-Na Jia,Bin Kong,Zhen Hong,Hu ZhangSchool of Materials Science...) alloy is composed of Nbss+Nb5Si3 eutectics within the whole withdrawal rate range, while the variation of rates makes a great difference on the solidification routes,the morphology and size of Nbss......
microstructure takes place. And in this undercooling range, directional dendritic solidification can be realized. Based on the microstructure observation as well as calculations of the solid/liquid.... [ Keyword: superundercooling; Cu 50 Ni 50 alloys; dendritic ripping; directional solidification; Received: 1999-12-21 单相合金凝固过程中, 存在临界过冷度ΔT*, 当......
of the pulsed magnetic field on the grain refinement of superalloy K4169 has been studied in directional solidification. In the presence of the solid–liquid interface condition, the distributions of the electromagnetic force, flow field, temperature field, and Joule heat in front of the solid–liquid interface in directional solidification with the pulsed magnetic field are simulated. The calculation......
定向凝固Ti-(44%-54%)Al合金的凝固相选择李新中1,孙涛2,于彩霞1,苏彦庆1,曹勇智2,郭景杰0,傅恒志2(1.黑龙江省哈尔滨市哈尔滨工业大学材料科学与工程学院2.哈尔滨工业大学 机电工程学院)摘 要:通过对Ti-(44%-54%)Al合金(原子分数)在较大的温度梯度与生长速率比值(G/v)范围内进行Bridgman定向凝固实验,研究了不同凝固条件下的固/液界面形态演化规律,包晶两相组织的形成规律及最终形成的片层结构的取向规律.采用充分形核假设及成分过冷判据,计算了不同成分Ti-Al合金相与组织随凝......
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燃气轮机用大型定向结晶铸件制备及组织与性能研究张健1,申健1,卢玉章1,楼琅洪1(1.辽宁省沈阳市科学院金属研究所)摘 要:对高温度梯度液态金属冷却(LMC)定向凝固技术中低熔点合金污染,模壳变形破裂等关键问题进行了分析,通过优化LMC定向凝固工艺,解决了430mm长大型铸件变截面位置的断晶,偏晶等问题,分析了铸件的显微组织,热处理工艺及典型力学性能,成功研制了大型定向结晶叶片.关键词:高温合金; 定向凝固; 液态金属冷却; 叶片......