電磁場(chǎng)對(duì)鎳基單晶高溫合金組織影響的研究

電磁場(chǎng)對(duì)鎳基單晶高溫合金組織影響的研究The effect of electromagnetic field on microstructureof ni-based sigle crystal superalloys

利用定向凝固技術(shù)，通過(guò)改變石墨套厚度獲得不同強(qiáng)度的磁場(chǎng)，研究了通電感應(yīng)線圈產(chǎn)生的磁場(chǎng)對(duì)DD90單晶高溫合金凝固組織的影響規(guī)律，同時(shí)結(jié)合Ansys有限元分析對(duì)合金熔體內(nèi)磁場(chǎng)、流場(chǎng)分布進(jìn)行了模擬。結(jié)果表明：當(dāng)石墨套厚度為10~30 mm時(shí)，單晶性保持完好；隨石墨套厚度的增加一次枝晶間距變大，二次枝晶間距變化規(guī)律與之相反，鑄態(tài)組織析出相γ′的尺寸、共晶組織含量明顯增加，元素偏析增大。合金熔體內(nèi)磁場(chǎng)、流場(chǎng)的Ansys有限元模擬表明，隨石墨套厚度的增加，熔體內(nèi)磁場(chǎng)強(qiáng)度、流速均逐漸減弱。在此基礎(chǔ)上，從磁場(chǎng)作用下熱電磁對(duì)流和熔體流動(dòng)的角度對(duì)結(jié)果進(jìn)行了分析和討論。

With the increase of the alloying degree and structural complexity as well as larger size in Ni-based superalloy blades, it is essentially important to suppress the solidification defects. When the electromagnetic field is introduced into solidification process, the solidification properties of alloy can be modified without changing the alloy composition, which can well eliminate the casting defects, such as the composition segregation, and to optimize the solidification microstructure and improve properties. The effect of induction coil magnetic field on solidification structure of DD90 single crystal superalloy is studied by changing the thickness of graphite sleeve. The distribution of magnetic field and flow field in alloy melt are analyzed by Ansys finite element analysis(FEM). The results show that when the thickness of the graphite sleeve is 10~30 mm, the monocrystalline remains intact and primary dendrite arm spacing increases with increasing the thickness, the second dendrites are the opposite rule. Moreover, the as-cast microstructures of γ′ phase size, eutectic structure and content increase significantly, and the element segregation increases simultaneously with increasing the graphite sleeve thickness. The Ansys FEM shows that the magnetic field and flow velocity in the melt decrease with the increase of the thickness of graphite sleeve. Based on the thermoelectric magnetic convection induced by the magnetic field during solidification and the effect of the convection on the microstructure, the above phenomenon is analyzed and discussed.

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