Effect of aging after mechanical polishing process on drawing performance of 0Cr25Al5 electrothermal alloy

doi:10.13251/j.issn.0254-6051.2022.04.028

Abstract

Abstract: Mechanical properties, microstructure and precipitates of mechanically polished 0Cr25Al5 Fe-Cr-Al electrothermal alloy after aging at different temperatures (150, 250, 350 ℃) and different time (1, 2, 3 h) were studied, and compared with those before and after mechanically polishing. The results show that after mechanical polishing, Cr₃C₂ is precipitated and distributed at the grain boundary with mainly rod-like and needle-like shape, accompanied by a small amount of spherical precipitates. After mechanical polihsing and then aging at 250 ℃ for 1 h, the hardness decreases, the tensile strength slightly increases, the elongation slightly decreases and the residual stress significantly decreases, meanwhile, the grain size remains the same and the precipitates is basically spherical with small size and distribution concentrated on grain boundaries, which is the Cr₇C₃ re-formed by exostatic precipitation from the dissolved Cr₃C₂. In addition, the oxide film does not regenerate which meets the requirements of subsequent drawing process. During the subsequent cold drawing production, the die loss and wire breakage rate of the 0Cr25Al5 Fe-Cr-al alloy after aging at 250 ℃ for 1 h decrease significantly comparing with that without aging treatment, and the finished product rate increases.

Key words: Fe-Cr-Al alloy, mechanical polishing, aging treatment, precipitated phase

CLC Number:

TG146.1⁺1

Hu Jing, Tao Ke, Yang Qingsong, Li Gang, Zhang Dehan. Effect of aging after mechanical polishing process on drawing performance of 0Cr25Al5 electrothermal alloy[J]. Heat Treatment of Metals, 2022, 47(4): 171-177.

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