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| 1 | Influences of processing parameters on microstructure during investment casting of nickel-base single crystal superalloy DD3显示文摘The effects of solidification variables on the as-cast microstructures of nickel-base single crystal superalloy DD3 have been investigated by using the modified Bridgman apparatus.The experiments were performed under a thermal gradient of approximately 45 K·cm-1 and at withdrawal rates ranging from 30 to 200 m·s-1.The experimental results show that the primary and secondary dendritic arm spacings(PDAS and SDAS) decrease when the withdrawal rate is increased.Compared with the theoretical models of PDAS,the results are in good agreement with Trivedi's model.The relationships of PDAS and SDAS with withdrawal rates can be described as ? 1 =649.7V -0.24±0.02 and? 2 =281V -0.32±0.03 ,respectively.In addition,the size of theγ′phase significantly decreases with increasing withdrawal rate. | Gao Sifeng Liu Lin Xu Yiku Yang Chubin Zhang Jun Fu Hengzhi | 2012 | China Foundry2012，9，2： | 4 |
| 2 | Effect of cooling rate on MC carbide in directionally solidified nickel-based superalloy under high thermal gradient显示文摘A series of directional solidification experiments have been performed to study the effect of cooling rate on the precipitation behavior of MC carbide in nickel-based superalloy under the temperature gradient of 500 K·s-1.Results reveal that the morphology of MC carbide changes from coarse block to fine strip,then to Chinese-script,and their sizes reduce gradually with the increasing of cooling rate from 2.53 K·s-1 to 36.4 K·s-1.At low cooling rates,most of these carbides are found to be located at the grain boundary and interdendritic regions,while the coupled growth of some carbides and γ matrix in the center of γ grains is occurred at high cooling rate.The main elements forming MC carbide are Ta,W,and Hf. | Zhang Weiguo Liu Lin Fu Hengzhi | 2012 | China Foundry2012，9，1： | 4 |
| 3 | Simulation of stray grain formation at the platform during Ni-base single crystal superalloy DD403 casting显示文摘The mechanism of stray grain formation at the platform of turbine blade simulator and the effect of withdrawal rate(V) on the stray grain phenomenon have been investigated using a macro-scale Pro CAST coupled with a 3D Cellular Automaton Finite Element(CAFE) model. The results indicate that the stray grains nucleate at the edges of platform at V =150 μm·s^(-1) and 200 μm·s^(-1). Using Pro CAST computer simulation software, it was proven that the stray grain formation is signifi cantly dependent on the undercooling and the temperature fi eld distribution in the platform. The macroscopic curvature of the liquidus isotherm becomes markedly concave with an increase in the withdrawal rate. The probability of stray grain formation at the edges of platform can be increased by increasing the withdrawal rate in the range of 70 μm·s^(-1) to 200 μm·s^(-1). | Si-feng Gao Lin Liu Jun Zhang Jun-feng Xiao Wen-shu Tang Yong-jun Li Qing Nan | 2015 | China Foundry2015，12，2： | 3 |
| 4 | Microstructural evolution of directionally solidified DZ125 superalloy castings with different solidification methods显示文摘The properties of Ni-base superalloy castings are closely related to the uniformity of their as-cast microstructure,and different solidification methods have serious effect on microstructural uniformity.In this paper,the influences of high rate solidification(HRS) process(with or without superheating) and liquid metal cooling(LMC) process on the microstructure of DZ125 superalloy were investigated.Blade-shape castings were solidified at rates of 40 μm·s-1 to 110 μm·s-1 using HRS process and a comparative experiment was carried out at a rate of 70 μm·s-1 by LMC process.The optical microscope(OM),scanning electron microscope(SEM) were used to observe the microstructure and the grain size was analyzed using electron back scattered diffraction(EBSD) technique.Results show that for the castings by either HRS or LMC process,the primary dendrite arm spacing and size of γ' precipitates decrease with increasing the withdrawal rate;the dendrites and γ' precipitates at the upper section of the blade are coarser than those in the middle,especially for the HRS castings without high superheating technique.When the withdrawal rate is 70 μm·s-1,the castings by HRS with high superheating technique have the smallest PDAS with fine γ' precipitates;while the size distribution of γ' precipitates is more homogenous in LMC castings,and the number of larger grains in LMC castings is smaller than that in the HRS castings.Moreover,high superheating technique yields smaller grains in the castings.Both the LMC method and HRS with high superheating technique can be used to prepare castings with reduced maximum grain size. | Ge Bingming Liu Lin Zhang Jun Li Yafeng Fu Hengzhi Liu Xiaofu | 2013 | China Foundry2013，10，1： | 0 |
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