Contrastive analysis of microstructural heterogeneity of Fe-based electrothermal alloy wires

doi:10.13251/j.issn.0254-6051.2021.04.036

Abstract

Abstract: Property of electrothermal alloy is connected to its chemical composition, microstructure and texture. The microstructure of two commercial Fe-based electrothermal alloy wires (0Cr25Al5 alloy and 0Cr21Al6Nb alloy) was investigated, and the microstructural heterogeneity was analyzed with emphasis, then the relationship between chemical composition, texture, radial position of the alloy wire and the grain size distribution was discussed. The results show that comparing with 0Cr25Al5 alloy specimen, the 0Cr21Al6Nb alloy specimen containing Nb shows more homogeneous grain size distribution and lower average grain size. Different oriented grains show different size distribution, and <110> oriented grains have the higher average grain size, but small <110> oriented grains have the lower quantity. Moreover, the grain size distribution shows different dependence on the radial position in these two electrothermal alloy wires. The range of grain size value is lower in 0Cr21Al6Nb alloy specimen, and the grain size distribution is not sensible to the radial position. In comparison, much higher grain size value range is shown in 0Cr25Al5 specimen, and the microstructure varies at different positions. To conclude, it is deduced that the lower average grain size and more uniform microstructure could be achieved by the addition of carbide forming elements, and the relationship between chemical composition, texture, radial position and the grain size distribution of alloy wires could provide reference to the microstructure control and property optimization in electrothermal alloy production.

Key words: electrothermal alloy, FeCrAl alloy, 0Cr25Al5 alloy, 0Cr21Al6Nb alloy, grain size, texture

CLC Number:

TG132

Zhang Qiang, Zhu Zhixiang, Chen Xin, Zhang Ning, Yin Xue, Zhu Jianxin, Meng Li. Contrastive analysis of microstructural heterogeneity of Fe-based electrothermal alloy wires[J]. Heat Treatment of Metals, 2021, 46(4): 196-199.

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