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| 1 | Effects of Alumina on Cristobalite Crystallization and Properties of Silica-Based Ceramic Cores显示文摘In this work, the influences of alumina addition on cristobalite crystallization and properties of injection molded silica-based ceramic cores were investigated. X-ray diffraction(XRD) was used to characterize phase transformations in the samples, and the XRD result indicated that the addition of alumina promoted crystallization of fused silica during sintering at 1180–1220 °C and thus increases the amount of cristobalite. The increased amount of cristobalite as well as alumina addition led to much more thermal dilation due to their higher coefficients of thermal expansion than that of fused silica. The flexural strengths at room temperature and 1500 °C were tested, and it was shown that alumina addition could not affect room temperature strength, but decreased the flexural strength at 1500 °C. In addition, deflection resistance during heating to high temperatures was investigated, and the result indicated that alumina addition speeded up high temperature softening of the samples. XRD and scanning electron microscopy equipped with energy dispersive spectrometry(SEM/EDS) analysis suggested that this softening behavior was related with viscous flow sintering which could be accelerated by the reaction of alumina and silica with a product of mullite. | J.J.Liang Q.H.Lin X.Zhang T.Jin Y.Z.Zhou X.F.Sun B.G.Choi I.S.Kim J.H.Do C.Y.Jo | 2017 | Journal of Materials Science & Technology2017，33，2： | 14 |
| 2 | Microstructural Stability of a Single Crystal Superalloy DD8 during Thermal Exposure显示文摘五分钱底单身者水晶合金 DD8 的微结构稳定性被调查了。标准热对待在在当演员组下面的 950 ° C .While 的显示出的好微结构稳定性调节的标本,一种像杆的阶段猛抛在内部当演员组标本的树枝状的区域在热暴露期间。阶段,让电子消息传输方式组织,与也预言的 Cr.Thermo 计算被充实在 Cr 富有的电子消息传输方式分阶段执行的约 950 ° C .The 的一个电子消息传输方式阶段的降水被看作 alpha-Cr 并且在当演员组条件下面由于 Cr 的分离形成了。 | K.Y.Cheng D.H.Kim Y.S.Yoo C.Y.Jo T.Jin Z.Q.Hu | 2008 | Journal of Materials Science & Technology2008，24，1： | 2 |
| 3 | Effect of Re Addition and Withdrawal Rate on the Solidification Behavior of Directionally Solidified Superalloy AM3显示文摘The influence of Re addition and withdrawal rate on the solidification behavior of the first generation single crystal superalloy AM3 was investigated by directional solidification and quenching experiments.The primary dendrite arm spacing and eutectic volume fraction were measured from directionally solidified superalloy AM3 with different Re contents.It is found that the primary dendrite arm spacing is determined by the withdrawal rate,and Re does not influence on the value.The eutectic fraction increases with increasing Re addition.Partition coeffcients of alloying elements were investigated with energy-dispersive X-ray spectrometry(EDS) analysis.The data was submitted to a statistical treatment to establish the solidification path,and the partition coeficients were measured by fitting the curve with a modified Scheil formula.It is shown that the addition of Re results in bigger microsegregation of alloying elements in directionally solidified AM3 superalloy. | F.Long Y.S.Yoo S.M.Seo T.Jin Z.Q.Hu C.Y.Jo | 2011 | Journal of Materials Science & Technology2011，27，2： | 2 |
| 4 | Temperatures in High Efficiency Deep Grinding (HEDG)显示文摘 | W.B.Rowe T.Jin | | 0，，： | 1 |
| 5 | 低温使用的9%Ni钢大锻件的生产显示文摘用调整了化学成分的9%Ni钢(Si,Mo含量低)浇成的一个180t钢锭和一个75t钢锭,卓有成效地锻成了一件特大的空心轴和一件厚300mm的圆盘。在制造这些大锻件的同时,进行了各种研究,如检查化学成分,机械性能,断裂韧性,热成形,超声波检验等,结果如下:(1)锻件的内部质量优越,AVG法超声波探伤显示的当量缺陷不超过φ0.5mm。(2)尽管锻件的尺寸很大(调质截面),在-196℃时,仍达到了令人满意的高的抗拉强度和良好的断裂韧性,甚至从300mm厚的圆盘中心取出的ISO-V型冲击试样,在此温度下也显示出令人满意的断裂韧性。 | M.Shimazaki T.Jin H.Moritani A.S.Melilli S.Toney 钟秉书 | 1982 | 大型铸锻件1982，，A02： | 0 |
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