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镍基双晶高温合金定向凝固过程中的竞争生长卢琦1,李金国1,金涛1,周亦胄1,孙晓峰1,胡壮麒1(1.辽宁省沈阳市科学院金属研究所)摘 要:研究了镍基双晶高温合金定向凝固过程中的竞争生长.实验结果表明:当原始籽晶一次枝晶方向均平行于热流方向且二次枝晶取向不同时,定向凝固过程中双晶共存,但双晶的界面存在波动,抽拉速率对其影响不大.当原始籽晶一次枝晶([001])异面并保持其中一组二次枝晶取向([010])相同时,双晶竞争生长过程是一个三维竞争生长过程.晶粒竞争生长从3个方向同时进行,择优取向晶粒通过螺旋状生长方式淘......
Research Institute), 1977, 6(1): 91－104. [11] DING Hao, FU Heng-zhi. Influence of drawing rate on formation of hot cracking of aluminum alloys in directional solidification process[J]. Material Science... Solidification crack susceptibility of aluminum alloy weld metals LIU Ren-pei(刘仁培)1, DONG Zu-jue(董祖珏)2, PAN Yong-ming(潘永明)2 1. College of Materials Science and Technology, Nanjing University......
的一致. 关键词:包晶合金；共生生长；Fe-Ni合金；定向凝固 中图分类号:TG 111.4; TG 113.12 文献标识码:A Coupled growth in directional solidification of eritectic alloys FU Heng-zhi1, 2, LUO Liang-shun1, SU... Processing, Northwestern Polytechnical University, Xi’an 710072, China) Abstract: The growth characteristic of peritectic alloy during directional solidification was analyzed theoretically and compared......
data from actual casting operations. From the observed casting experiment, the preliminary grain morphologies are the directional columnar grains by the VCC process. The solidification morphologies... Numerical simulation of solidification morphologies of Cu-0.6Cr casting alloy using modified cellular automaton model TSAI De-chang, HWANG Weng-sing Department of Materials Science......
定向凝固NiAl-Cr(Mo)-Hf(Ho)共晶合金的组织与性能肖璇1,谢亿2,郭建亭3(1.辽宁省沈阳市沈阳理工大学材料科学与工程学院2.湖南省电力公司 试验研究院3.中国科学院 金属研究所, 沈阳 110016)摘 要:通过液态金属冷却技术制备了名义成分为Ni-30.4Al-34Cr-4.3Mo-0.1Hf-0.05Ho(原子分数,%)的定向合金.定向凝固工艺消除了普通铸造合金中的初生Cr(Mo)相,获得了共晶组织.随抽拉速率从8 mm/min提高到15 mm/min,合金中的共晶胞尺寸从115μm减小到8......
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the cooling rate is high. 关键词:nucleation & growth; casting; directional solidification; [全文内容正在添加中] ......
高温度梯度定向凝固镍基高温合金DZ125的组织演化闵志先1,沈军1,熊义龙1,王伟1,杜玉俊1,刘林1,傅恒志1(1.陕西省西安市西北工业大学凝固技术国家重点实验室)摘 要:采用液态金属冷却(LMC)定向凝固结合液淬法,在温度梯度(G)为250K/cm,凝固速率(V)为2-400μm/s的条件下系统研究了镍基高温合金DZ125的固/液界面形态,胞/枝晶间距及MC碳化物形态.随着V的增大,界面形态经历了浅胞状→深胞状→粗枝晶→细枝晶的转变.一次胞晶间距随着V的增大而增大,当V=5μm/s时,固/液界面达到胞枝转变......
定向凝固镍基高温合金DZ125平界面生长的微观组织演化闵志先1,沈军1,王灵水1,冯周荣1,刘林1,傅恒志1(1.陕西省西安市西北工业大学凝固技术国家重点实验室)摘 要:采用液态金属冷却(LMC)定向凝固技术,对镍基高温合金DZ125在凝固速率为1.5μm/s的条件下其平界面生长的微观组织演化规律进行了研究.结果表明:凝固组织演化经历3个不同的阶段,当凝固分数fs≤0.26时,为单相γ组织,基体中零星分布着细小的颗粒状的未熔HfC;当0.26<fs<0.86时,为γ/MC共生组织,MC为纤维状或者板......
. The solidification on the interstice scale was regarded as a directional solidification. Then, the concept of the character length (Lc) was forward, which described the size of the reinforcement local influential... be regarded as directional solidification. Before the application of following mathematical model, there are some assumptions. Firstly, the matrix is the pure metal and does not nucleate on the surface......
