C微合金化对Fe-Mn-Cr-Ni中熵合金微观结构和力学性能的影响

doi:10.13251/j.issn.0254-6051.2024.06.033

金属热处理 ›› 2024, Vol. 49 ›› Issue (6): 206-210.DOI: 10.13251/j.issn.0254-6051.2024.06.033

C微合金化对Fe-Mn-Cr-Ni中熵合金微观结构和力学性能的影响

李娜, 孙书刚, 杨建春, 汪淇

南通理工学院机械工程学院, 江苏南通 226001

收稿日期:2023-02-08 修回日期:2024-04-25 出版日期:2024-06-25 发布日期:2024-07-29
作者简介:李娜(1988—),女,讲师/工程师,硕士,主要研究方向为中/高熵合金的组织性能,E-mail:lin@ntit.edu.cn
基金资助:
南通市基础科学研究(JC22022055);南通理工学院科研项目(2022XK(Z)03);南通理工学院骨干教师计划(ZQNGGJS202102)

Effect of C microalloying on microstructure and mechanical properties of Fe-Mn-Cr-Ni medium entropy alloy

Li Na, Sun Shugang, Yang Jianchun, Wang Qi

School of Mechanical Engineering, Nantong Institute of Technology, Nantong Jiangsu 226001, China

Received:2023-02-08 Revised:2024-04-25 Online:2024-06-25 Published:2024-07-29

摘要/Abstract

摘要： 采用真空电弧熔炼和铜模吸铸法制备了Fe₅₀Mn₂₅Cr₁₅Ni₁₀和(Fe₅₀Mn₂₅Cr₁₅Ni₁₀)₉₉C₁中熵合金,随后将合金进行室温轧制80%,并在900 ℃进行退火,通过XRD、SEM及EBSD等检测设备研究了C微合金化对合金微观组织和力学性能的影响。结果表明,Fe₅₀Mn₂₅Cr₁₅Ni₁₀和(Fe₅₀Mn₂₅Cr₁₅Ni₁₀)₉₉C₁中熵合金为FCC单相结构,添加C元素后,合金的晶粒细化。900 ℃×10 min退火的合金,在室温下(25 ℃)的屈服强度和抗拉强度由381、586 MPa提高至535、756 MPa,低温下(-196 ℃)的屈服强度和抗拉强度由687、1114 MPa提高至980、1352 MPa。随着温度由25 ℃降至-196 ℃,(Fe₅₀Mn₂₅Cr₁₅Ni₁₀)₉₉C₁中熵合金的强度和塑性同时得到提高,具有较佳的强塑积,主要归因于C元素的添加所引起的细晶强化、固溶强化和位错增殖。

关键词: 中熵合金, 微合金化, 微观结构, 力学性能

Abstract: Fe₅₀Mn₂₅Cr₁₅Ni₁₀ and (Fe₅₀Mn₂₅Cr₁₅Ni₁₀)₉₉C₁ medium-entropy alloys (MEAs) were prepared by vacuum arc melting and copper mold suction casting. Then the alloys were rolled by 80% at room temperature and annealed at 900 ℃, the effects of C microalloying on microstructure and mechanical properties of the MEAs were studied by means of XRD, SEM and EBSD. The results show that the microstructure of Fe₅₀Mn₂₅Cr₁₅Ni₁₀ and (Fe₅₀Mn₂₅Cr₁₅Ni₁₀)₉₉C₁MEAs is FCC single phase structure. With the addition of C element, the grains of the alloy are refined. The yield strength and tensile strength of the MEAs annealed at 900 ℃ for 10 min increase from 381 MPa and 586 MPa to 535 MPa and 756 MPa at room temperature (25 ℃), and from 687 MPa and 1114 MPa to 980 MPa and 1352 MPa at low temperature (-196 ℃). With the decrease of temperature from 25 ℃ to -196 ℃, the strength and ductility of (Fe₅₀Mn₂₅Cr₁₅Ni₁₀)₉₉C₁ alloy increase at the same time, resulting in better product of strength and elongation, which are mainly attributed to the appearance of fine grain strengthening, solid solution strengthening and dislocation multiplication caused by the addition of C element.

Key words: medium entropy alloy, microalloying, microstructure, mechanical properties

中图分类号:

TG113

李娜, 孙书刚, 杨建春, 汪淇. C微合金化对Fe-Mn-Cr-Ni中熵合金微观结构和力学性能的影响[J]. 金属热处理, 2024, 49(6): 206-210.

Li Na, Sun Shugang, Yang Jianchun, Wang Qi. Effect of C microalloying on microstructure and mechanical properties of Fe-Mn-Cr-Ni medium entropy alloy[J]. Heat Treatment of Metals, 2024, 49(6): 206-210.

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C微合金化对Fe-Mn-Cr-Ni中熵合金微观结构和力学性能的影响

Effect of C microalloying on microstructure and mechanical properties of Fe-Mn-Cr-Ni medium entropy alloy

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