Influence of high-temperature air pre-exposure on mechanical strength of a directionally solidified cobalt-base superalloy |
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| Authors: | W. H. Jiang X. F. Sun H. R. Guan Z. Q. Hu |
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| Affiliation: | (1) Institute of Metal Research, The Chinese Academy of Sciences, No. 72 Wenhua Road, Shenyang, 110015, People's Republic of China;;(2) Department of Metal Materials Engineering, Shenyang University of Technology, No. 58 South Xinghua Street, Shenyang, 110023, People's Republic of China |
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| Abstract: | The present work investigated the influence of air pre-exposure at 850°C for 1000 h on the mechanical properties and microstructures of the directionally solidified cobalt-base alloy DZ40M. The results show that the air pre-exposure did not embrittle the alloy, but resulted in a marked strengthening. Microstructural observations and energy dispersive X-ray spectroscopy (EDS) indicates that the air pre-exposure caused a substantial external and internal oxidation, which is assumed to protect the alloy from being oxidized further and make a significant contribution to alloy strengthening, respectively. The immunity of the alloy to air embrittlement is attributed to elimination of transverse grain boundaries by directional solidification. |
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