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回火温度对FCC高熵合金Fe49.5Mn29.7Co9.9Cr9.9C1显微组织和力学性能的影响
Effect of Tempering Temperature on the Microstructure and Mechanical Properties of Fe49.5Mn29.7Co9.9Cr9.9C1 HEA
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- DOI:
- 作者:
- 李小琳，赵利媛，李雅婷，郝晓晓，王海丰
LI Xiaolin, ZHAO Liyuan, LI Yating, HAO Xiaoxiao, WANG Haifeng
- 作者单位:
- 西北工业大学 凝固技术国家重点实验室，陕西 西安 710072
(State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
- 关键词:
- 加工工艺；高熵合金；TWIP 效应；TRIP 效应；力学性能
processing technology; high-entropy alloy; TWIP effect; TRIP effect; mechanical performance
- 摘要:
- 高熵合金具有很多优于传统钢材的特殊性能，故被广泛研究，但其室温强度较低仍是目前亟需解决的问题
之一。 本文在 FCC 高熵合金 Fe50Mn30Co10Cr10 的基础上加入 1%C(原子分数)，拟通过析出强化提高高熵合金的屈服强
度。 研究表明，高熵合金经锻造、轧制及退火后组织中主要包含 FCC 相和少量 HCP 相，且在 650、800 及 900 ℃退火温
度时在 FCC 相中均分布着高密度纳米析出相。 根据 EDS 分析可得析出相为 Cr23C6，其对晶界起到钉扎效果，可显著提
高合金屈服强度。 高熵合金在拉伸变形过程中， 随着应变的增加 HCP 相含量及变形孪晶含量增加， 即产生 TRIP 和
TWIP 效应来提高合金的加工硬化率，从而在提高屈服强度的基础上保证合金具有良好的塑性。
High-entropy alloys (HEAs) have been widely investigated due to their special properties, which are superior to those of traditional steels. However, the relatively low yield strength is one of the tough problems that need to be solved. In this paper, 1%C(atomic percentage) was added to an Fe50Mn30Co10Cr10 FCC high-entropy alloy to increase the yield strength of the alloy by precipitation strengthening. The result shows that the structure of the high-entropy alloy after forging, rolling and annealing is mainly composed of an FCC matrix and a small amount of the HCP phase. High-density nanoprecipitates are distributed in the FCC phase after annealing at 650, 800 and 900 ℃, which are identified as Cr23C6 by EDS, playing a pinning effect on the grain boundaries and thus increasing the yield strength of the alloy. In the process of tensile deformation of the high-entropy alloy, the content of the HCP phase and deformation twins increase with increasing tensile strain. In general, TRIP and TWIP effects can improve the work hardening rate of the alloy and ensure that the alloy has a high yield strength and good plasticity