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, WU Shi-ping, LI Bang-sheng, FU Heng-zhi. Phase-field simulation of structure evolution at high growth velocities during directional solidification of Ti55Al45 alloy[J]. Intermetallics, 2005, 13(3/4... Microstructure of a two-phase titanium alloy by rapid solidification technique LIU Xing-xing(刘星星)1, 2, LONG Ling(龙玲)1, 2, YAN Biao(严彪)1, 2, TANG Ren-jian(唐人剑)1, 2, ZOU Hong-liu(邹洪流)1, 2 1......
处理改变了熔体结构状态. 关键词:定向凝固；过热处理；一次枝晶间距；熔体结构；凝固组织 中图分类号:TG 132.3 文献标识码:A Influence of melt superheat treatment on directional solidification microstructure of Al-4.7%Cu... on the directional solidification microstructure of Al-4.7%Cu(mass fraction) alloy was studied at 750, 850, 950 and 1 050 ℃, respectively. The characteristics of the melt were measured by integrated thermal......
横向磁场对镍基高温合金定向凝固组织的影响董建文1,任忠鸣1,任维丽1,李喜1,李旭1(1.上海市上海大学上海市现代冶金与材料制备重点实验室)摘 要:研究了横向磁场对镍基高温合金DZ417G定向凝固显微组织的影响.在较低生长速率条件下,磁场显著影响合金的枝晶生长和宏观偏析.施加磁场后一次枝晶间距减小并在沿磁场方向试样的左侧出现了"斑状"偏析.随着生长速率的增加,磁场的影响减弱.从磁场在合金熔体中诱发热电磁对流,并影响枝晶生长的角度对实验结果进行了分析.关键词:镍基高温合金； 横向磁场； 定向凝固； ......
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planar temperature isosurfaces in case 1, the solid-liquid interface moved up along the z direction as the solidification progressed. This is considered directional solidification and its velocity... of case 2 are little accidented. It still considered directional solidification but its velocity remained at about 0.3-0.4 mm/s. In solidification process, the side channels will be opened from bottom......
:single crystal superalloy; defect tolerance; directional solidification; creep rupture; [全文内容正在添加中] ...:Carbon and boron have been considered to strengthen grain boundaries that might form during single crystal casting.In this study the effect of boron on solidification behavior and creep properties......
考虑炉壁温度变化的高温合金叶片定向凝固过程模拟潘冬1,许庆彦2,柳百成2(1.北京市清华大学机械工程系先进成形制造重点实验室2.清华大学 机械工程系 先进成形制造教育部重点实验室)摘 要:考虑炉壁温度的变化,基于Monte Carlo射线追踪法建立了高温合金叶片定向凝固过程的温度场计算改进模型.通过法向射线加密提高加热炉炉壁的辐射计算精度,并采用叶片三维有限差分网格和加热炉二维网格混合使用的方法提高计算效率.叶片和炉壁的温度曲线模拟与实验结果吻合良好,改进模型反映了抽拉过程中炉壁温度的变化及其对叶片内部温度分布......
温度梯度对定向凝固TiAl基合金片层取向的影响肖志霞1,郑立静1,杨莉莉1,闫洁1,张虎1(1.北京市北京航空航天大学材料科学与工程学院空天材料与服役教育部重点实验室)摘 要:利用定向凝固方法研究了在1580和1650℃加热温度下Ti-47Al-2Cr-2Nb合金不同片层取向的晶粒竞争生长规律.显微组织分析表明,合金初生相为β相,随后发生包晶反应形成α相,并在β→α转变时α相依附已有β相形核,12种α变体中仅形成了一种特定取向的α变体,两相区平均温度梯度由40K/cm增大至160K/cm,从而使凝固界面形态由柱......
Effects of Ca(Y)-Si modifier on interface morphology and solute segregation during directional solidification of an austenite medium Mn steelGaofei Liang, Zhenming Xu, and Jianguo Li School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China摘 要:<正>The austenite medium Mn steel modified with controlled......
双晶镍基高温合金定向凝固过程的结构演化周亦胄1,金涛1,孙晓峰1(1.辽宁省沈阳市科学院金属研究所)摘 要:研究了双晶镍基高温合金IN792定向凝固过程的结构演化.对于汇聚生长晶粒,非择优取向枝晶在晶界处能够阻挡择优取向枝晶的生长,从而导致晶界从非择优取向晶粒向择优取向晶粒倾斜,竞争长大的结果是择优取向晶粒消失,非择优取向晶粒获胜:对于发散生长晶粒,晶界处会形成新的技晶,从而导致晶界从择优取向晶粒向非择优取向晶粒倾斜.竞争长大的结果是择优取向晶粒获胜,非择优取向晶粒消失.关键词:高温合金； 定向凝......
