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investment casting made by Zr(CH3COO)2-Y2O3 shell in vacuum casting was studied.Statistic was manipulated to study the distributions and types of the reaction layers. The morphology and composition... diffraction(XRD).Composition of the shell reaction zone was measured by X-ray fluorescence(XRF) method. The results suggest the reaction contains oxidation and element evaporation, and the melt reacts......
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scheme is as follows: Test 1: gravity casting and alumina based mould shell; Test 2: gravity casting and zirconia based mould shell; Test 3: centrifugal casting and alumina based mould shell; Test 4: centrifugal casting and zirconia based mould shell. The samples were cut from the casts in the reaction interface. The size of the samples was 5 mm×5 mm×5 mm. After being burnised, polished......
Twin-roll strip casting of magnesium alloys in China DING Pei-dao(丁培道)1, PAN Fu-sheng(潘复生)1, JIANG Bin(蒋 斌)1, WANG Jian(王 健)1, LI Hua-lun(李华伦)2, WU Jiang-cai(吴江才)2, XU Yue-wang...; Abstract: The development status of twin-roll strip casting for magnesium alloys in China was summarized as well as the new progress when several kinds of twin......
基于圆柱形孔洞体胞模型分析的铸造镁合金ML316本构描述 孙士涛1,范镜泓1,罗吉1,陈斌1 (1.重庆大学,重庆,400044) 摘要:假设在铸造镁合金材料中的微孔洞具有圆柱形的形状,然后隔离一个圆柱形微孔洞,建立圆柱形微孔洞体胞模型,在基体不可压条件下,得到圆柱形微孔洞的演化方程.根据圆柱形微孔洞体胞模型的速度场得到其应变场,进而基于材料内时本构理论,定义与材料孔洞弱化相关的内蕴时间,得到考虑变形强化和孔洞长大弱化的材料弹塑性本构方程.发展相应的有限元分析程序及数值算法,用其描述铸造镁合金试件在拉伸载荷作用下的应力与应变,塑性变形与材料孔隙率的关系以及试件缺口前缘孔隙率的变化,分析结果与实验结果有较好的一致性. 关键词:铸造镁合金; 圆柱形孔洞模型; 孔洞演化方程; 本构方程; 有限元计算; casting magnesium alloy; cylindrical void......
stresses and two stability loads closely related to the ring stiffened cylindrical shell were calculated. Three crucial factors were taken into account, i.e. shell thickness, stiffeners distance... depth, the maximum stress is 288.6 MPa, and the maximum displacement is 3 mm. Key words: refuge chamber; ring stiffened cylindrical shell; bearing pressure performance; key stress; stability load 煤矿透水事......
Technology of centrifugal casting for titanium alloyTIAN Jing(田 竞), XIAO Shu-long(肖树龙),CHEN Yu-yong(陈玉勇), CHEN Zi-yong(陈子勇)(National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)Abstract:The investment technologies of preparing wax moulds, mould shells and technology of centrifugal casting......
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DC casting of light alloys under magnetic fields CUI Jian-zhong(崔建忠), ZHANG Zhi-qiang(张志强), LE Qi-chi(乐启炽) Key Laboratory of Electromagnetic Processing of Materials of Ministry of Education, Northeastern University, Shenyang 110004, China Received 23 October 2009; accepted 6 September 2010 Abstract: The working principle of LFEC(Low frequency electromagnetic casting) process developed......
)03-0967-10 Effect of a new friction pendulum bearing on seismic response of single-layer cylindrical reticulated shell considering pile-soil-structure interaction LIU Yi1, 2, XUE Suduo1, PAN Kejun3, LI... bearing was simplified with the bilinear model. A single-layer cylindrical reticulated shell model was established in consideration of the pile-soil-structure interaction and isolation (PSSII......
