Effect of friction stir welding on the structure and mechanical properties of the CoCrFeNiMn-0.9%C alloy

D. Shaysultanov, N. Stepanov, I. Vysotskiy, S. Zherebtsov
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引用次数: 2

Abstract

CoCrFeNiMn-0.9%C high entropy alloy (HEA) was produced by self-propagating high-temperature synthesis. The as-sintered alloy was cold rolled and annealed at 900°C to produce refined microstructure before friction stir welding (FSW). The structure of the annealed alloy consisted of a recrystallized face-centered cubic (fcc) matrix with a grain size of 9.2 µm and fine M23C6 carbides with 2% volume fraction. Good quality of butt joints after FSW was observed. It was established that an increase of the tool rotation speed from 600 to 1000 rpm increased the average grain size from 3.2±0.7 µm to 4.6±2.4 µm, respectively. The structure of the stir zone contained M23C6 carbides in all conditions. Hardness and strength of the joints decreased with the increase of tool rotation speed due to higher grain size, while ductility increased.
搅拌摩擦焊对CoCrFeNiMn-0.9%C合金组织和力学性能的影响
采用高温自扩散法制备了CoCrFeNiMn-0.9%C高熵合金。在搅拌摩擦焊(FSW)前,对烧结态合金进行冷轧和900℃退火,得到细化的组织。退火合金的组织由晶粒尺寸为9.2µm的面心立方(fcc)再结晶基体和体积分数为2%的细小M23C6碳化物组成。FSW后的对接质量良好。结果表明,当刀具转速从600转增加到1000转时,平均晶粒尺寸分别从3.2±0.7µm增加到4.6±2.4µm。搅拌区结构在所有条件下均含有M23C6碳化物。随着刀具转速的增加,晶粒尺寸增大,接头的硬度和强度降低,而塑性增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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