微量元素對超合金熱成型性影響之研究

張哲銘

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微量元素對超合金熱成型性影響之研究

Effect of minor elements on the hot deformation behaviours of a superalloy

張哲銘 , Masters　　Advisor：葉安洲　　

英文

超合金；雜質；熱成形；沿晶斷裂；鎂； superalloy ； impurity ； hot deformation ； intergranular fracture ； magnesium

Abstract │ Reference (64) │ Altmetrics

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Incoloy A-286 is a Fe-Ni based superalloy and it is widely used in gas turbine industry, jet engines and other applications. Although A-286 has a long service history, the fabrication of A-286 is not without any challenges. The hot deformation property for this alloy is highly sensitive to its composition, especially the content of impurity such as sulfur (S). In present study, a batch of A-286 has suffered from cracking issue during rolling process at high temperature and detailed examinations have revealed that phenomena of liquation of Ti-rich phase induced by eutectic reaction with S appeared at grain boundary and caused intergranular fracture. To improve the hot deformation behaviors of A-286, alloy design has been performed with the minor addition of magnesium (Mg). Furthermore, its combined effect with manganese (Mn) has been examined. Experiments include tensile tests at 1050oC and 1175oC, cyclic oxidation at 900oC, detailed microstructure/fracture surfaces observations and composition analysis by OM, SEM-EDS, TEM-EDS, Auger, and EPMA. In conclusion, Mg addition can eliminate the phenomena of Ti-rich phase liquation, the high temperature deformation behaviours of A-286 can then be improved.

Reference ( 64 ) 〈TOP〉

2. Rho, B.S., Hong, H.U. and Nam, S.W., Analysis of the intergranular cavitation of Nb-A286 alloy in high temperature low cycle fatigue using EBSD technique. Scripta Materialia, 2000. 43(2): p. 167-173.
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3. Seifollahi, M., et al., The Mechanism of eta Phase Precipitation in A286 Superalloy During Heat Treatment. Journal of Materials Engineering and Performance, 2013. 22(10): p. 3063-3069.
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6. Muhmond, H.M. and Fredriksson, H., An Investigation on the Effect of S and Al on the Austenite Growth Morphology in Gray Cast Iron, Using Thermal Analysis and Etching Technique. Transactions of the Indian Institute of Metals, 2013. 66(2): p. 185-192.
連結：
7. Ma, P. and Zhu, J., Magnesium Distribution in a Nickel-Based Superalloy. Metallography, 1986. 19(1): p. 115-118.
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9. Tavakkoli, M.M. and Abbasi, S.M., Effect of molybdenum on grain boundary segregation in Incoloy 901 superalloy. Materials & Design, 2013. 46: p. 573-578.
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