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A comprehensive understanding of grain selection in spiral grain selector during directional solidification

Journal of Materials Science & Technology 2022年第7期102卷 204-212页

作者： Binqiang Wang Long Zeng Neng Ren Mingxu Xia Jianguo Li School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

It is of great importance to further investigate grain selection mechanism for the production of single crystal(SX) turbine blade because a single crystal with optimized crystal orientation will enhance service performance of the blade *** this paper,single crystals with different deviation angles,i.e.6°,12° and 29°, were obtained using directional solidification under the same casting *** has been found that the grain selection in spiral selector is a coupling process where high order dendrites branch in the front side and primary dendrites disappear in the back side based on the metallographic analysis and electron back scatter diffraction(EBSD).Considering the development of liquid/solid interface by numerical simulation,a combination effect with space expansion,geometrical restriction and grain competition was proposed for spiral grain *** space expansion mechanism dominates the process as it provides growth space and driving force for high order dendrites ***,the smaller the take-off angle(θ) is,the larger space and the stronger driving force high order dendrites will get,and the higher efficient the selector will be. The competitive growth between the secondary dendrites plays more contribution than that of primary dendrites,*** with preferred secondary dendrites instead of preferred primary dendrites could outcompete during grain selection,and this is the reason why spiral grain selector cannot optimize the orientation of the primary *** findings provide experimental evidence for spatial control of SX growth,and benefit the sophistic casting fields such as turbine blade casting for improved yield.

关键词： Ni-based superalloy spiral grain selector Space expansion Geometrical restriction grain competition

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维普期刊数据库

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Effect of competitive crystal growth on microstructural characteristics of directionally solidified nickel-based single crystal superalloy

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China Foundry 2022年第2期19卷 109-116页

作者： Mang Xu Xiao-qi Geng Xiang-long Zhang Guo-huai Liu Ye Wang Zhao-dong Wang Jing-jie Guo State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China School of Materials Science and Engineering Harbin University of Science and TechnologyHarbin 150040China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

Directionally solidified single crystal superalloy test bars were prepared by the spiral grain selection *** microstructural evolution and orientation characteristics of the starter block and spiral part were studied,and the influence of the competitive growth of crystals on the microstructural characteristics was *** results show that the divergent grain groups,with small size and randomly oriented grains,appear at the bottom of the start block due to the chilling effect,which is an important area for competitive *** the height of the starter block increases,the primary dendrite spacing increases,and the grain density decreases;furthermore,the proportion of grains with an orientation deflection angle less than 10°gradually ***texture gradually becomes stronger as the height of the starter block increases,which indicates that the competitive growth of crystals gradually *** the initial stage of the crystal selection in the spiral part,the obstacle of adjacent grains and spiral passage is the main working *** grains located at the inner side of the front edge of the spiral passage have the growth *** single crystal screening process is achieved at about two-thirds of the spiral height,and the single crystal with the orientation deviation angle of 6.7°from the casting axis is prepared.

关键词： directional solidification Ni-based superalloy microstructural evolution spiral grain selector single crystal

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维普期刊数据库

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Influence of spiral crystal selector on crystal orientation of single crystal superalloy

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Transactions of Nonferrous Metals Society of China 2012年第5期22卷 1092-1095页

作者：张如林陈丽娜李重河王宁鲁雄刚任忠鸣上海大学、上海市现代冶金及材料制备重点实验室上海200072 宝山钢铁股份有限公司上海201900

To increase efficiency and improve performance, reducing cost and emissions, advanced single crystal Ni-based superalloys are required in aerospace propulsion and power generating gas turbines. With the development of alloy, significant improvements in casting techniques have been achieved by introducing the directionally solidified （DS） casting process followed by single crystal （SX） technique. The deviation of preferred orientation of single crystal superalloys is one of the most important defects in casting. In directional solidification equipment with high temperature gradient, single crystal specimens of DZ417G alloy were prepared successfully by the modified Bridgeman method with spiral grain selector. The orientation was investigated by means of X-ray diffraction （XRD） and electron backscattered diffraction （EBSD）.The results show that the crystal selector with a smaller angle can effectively reduce the deviation of preferred orientation.

关键词： nickel-base superalloy directional solidification single crystal superalloy crystal orientation spiral grain selector

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维普期刊数据库

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Effects of directional solidification parameters and crystal selector on microstructure of single crystal of Ni-base superalloys

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Journal of Central South University 2018年第1期25卷 1-8页

作者： LI Chong-he WEI Chao ZHANG Ru-lin WANG Hong-bin REN Zhong-ming LU Xiong-gang State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering Shanghai University Shanghai 200072 China Shanghai Special Casting Engineering Technology Research Center Shanghai 201605 China Shanghai Aircraft Manufacturing Co. Ltd. Shanghai 200436 China Shanghai Dianji University Shanghai 201306 China

The single crystal of nickel-base super alloy is widely used for making turbine *** microstructure of the alloy,especially the deviation of preferred orientation of single crystal,possesses the most important effects on the mechanical properties of the *** this study,the single crystal ingot and blade of DZ417G alloy are prepared by means of the spiral crystal selector as well as the directional solidification method,and the effect of the parameters(i.e.,the shape of samples,the withdrawal rate)and the structure of the spiral crystal selector on the formation of single crystal and the crystal orientation are *** method can prepare not only the single crystal ingot with simple shape but also the single crystal blades with the complex shape,the simple with rod-shape can form the single crystal easily with a relatively fast withdrawal rate,but the blade with complex shape requires much slower withdrawal rate to form single *** length of the crystal selector almost has no effect on the crystal ***,the angle of selector plays an obvious role on the orientation;the selector with a smaller angle can effectively reduce the deviation of preferred orientation;the appropriate angle of selector to obtain optimal orientation is found to be around30°and the deviation of preferred orientation is about30°for this selector.

关键词： DZ417G alloy high rapid solidification crystal orientation single crystal superalloy spiral grain selector

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