Effects of shell mold heating temperature on microstructures and freckle formation of single crystal superalloys

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Transactions of Nonferrous Metals Society of China Pub Date : 2024-04-01 DOI:10.1016/S1003-6326(24)66463-0

Zhi-cheng WANG, Jia-rong LI, Shi-zhong LIU, Wan-peng YANG, Xiao-guang WANG

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Abstract

To study the effects of shell mold heating temperature on the microstructure and freckle formation of single crystal superalloys, the directional solidification experiment and simulation were conducted with designed stepwise specimens. The temperature field and morphology of mushy zone were analyzed. The results show that the primary and secondary dendrite arm spacings both decrease with the rise of shell mold heating temperature. This reduces the permeability of the liquid in the mushy zone and the width of the thermal-solutal convection channel, which reduces the formation tendency of freckles, the width of freckles and the number of dendritic fragments in freckled areas. In addition, with the increase of shell mold heating temperature, the cooling rate of liquid in the mushy zone increases, which reduces the cooling time of the melt in the mushy zone, weakens the breaking capability of liquid flow to the dendrite, and further reduces the tendency of freckle formation in single crystal superalloy castings.

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壳模加热温度对单晶超合金微观结构和雀斑形成的影响

为了研究壳模加热温度对单晶超合金微观结构和雀斑形成的影响，采用设计的分步试样进行了定向凝固实验和模拟。对温度场和粘稠区形态进行了分析。结果表明，随着壳模加热温度的升高，初级和次级枝晶臂间距都会减小。这降低了粘稠区液体的渗透性和热固性对流通道的宽度，从而降低了雀斑的形成趋势、雀斑的宽度和雀斑区树枝状碎片的数量。此外，随着壳模加热温度的升高，粘稠区液体的冷却速度增加，从而缩短了粘稠区熔体的冷却时间，削弱了液体流向枝晶的断裂能力，进一步降低了单晶超级合金铸件中雀斑的形成趋势。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.