
倾斜籽晶法控制镍基单晶高温合金晶体取向研究
Controlling crystal orientation of Ni-based single crystal superalloy by inclined seeding method
本工作提出一种倾斜放置籽晶制备镍基单晶高温合金以获得特定取向单晶铸件的方法,采用实验和数值模拟研究该方法制备单晶过程中凝固组织演化过程及其机制,并讨论了倾斜籽晶控制单晶铸件晶体取向的原理。结果表明:通过改变〈001〉取向的籽晶与铸件之间的位向关系,可以制备出特定取向的单晶铸件。单晶制备过程中籽晶部分回熔,回熔界面与籽晶轴向垂直,定向凝固过程中熔体沿未熔籽晶外延生长形成单晶。
An inclined seeding method for Ni-based single crystal superalloy with a specific orientation is presented. The evolution of solidification microstructure and its mechanism are studied during the preparation of single crystals by this method through experiment and numerical simulation. The principle of controlling the crystal orientation of single crystal castings by inclined seeding crystals is discussed. The results show that single crystal castings with specific orientations can be produced by changing the orientation relationship between the 〈001〉 orientation seed and the casting. During the preparation process of single crystal, the seed is partially un-melted, and the un-melted interface is perpendicular to the seed axial. The melting alloy grows epitaxially along the un-melted seed to form a single crystal casting during the directional solidification process.
镍基单晶高温合金 / 倾斜籽晶 / 晶体取向 / 凝固过程 {{custom_keyword}} /
Ni-based single crystal superalloy / inclined seeding / crystal orientation / solidification process {{custom_keyword}} /
图3 倾斜籽晶纵截面(a)与常规籽晶纵截面(b)显微组织(与定向凝固方向平行)及倾斜籽晶A区域(c)、B区域(d)、C区域(e)、D区域(f)典型横截面(垂直籽晶轴线方向)显微组织Fig.3 Longitudinal section microstructures of inclined seed(a) and conventional seed(b) paralleling to directional solidification,and typical cross-section microstructures in areas A(c),B(d),C(e),D(f) perpendicular to axis of inclined seed |
图4 倾斜籽晶法获得的单晶铸件横、纵截面显微组织及晶体取向的反极图(a)横截面显微组织;(b)纵截面显微组织;(c)反极图(插图为斑点区域的局部放大图)Fig.4 Cross-section and longitudinal section microstructures of single crystal casting prepared by inclined seed method(a)cross-section microstructure;(b)longitudinal section microstructure;(c)inverse pole figure(the inset showing the local amplification of the spotted region) |
图5 常规籽晶法获得的单晶铸件横、纵截面显微组织及晶体取向的反极图(a)横截面显微组织;(b)纵截面显微组织;(c)反极图(插图为斑点区域的局部放大图)Fig.5 Cross-section and longitudinal section microstructures of single crystal casting prepared by conventional seed method(a)cross-section microstructure;(b)longitudinal section microstructure;(c)inverse pole figure(the inset showing the local amplification of the spotted region) |
图6 单晶制备过程中温度场演化过程(a)保温阶段;(b)抽拉100 s;(c)抽拉200 s;(d)抽拉400 s;(1)倾斜籽晶法;(2)常规籽晶法Fig.6 Evolution of temperature field during single crystal preparation process(a)holding stage;(b)pulling for 100 s;(c)pulling for 200 s;(d)pulling for 400 s;(1)inclined seeding method;(2)conventional seeding method |
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