时效处理对<strong>Fe-12Mn-8Al-1C-3Cu</strong>轻质钢的组织演变和力学性能的影响

doi:10.11901/1005.3093.2023.270

材料研究学报

2024, Vol. 38

Issue (5): 356-364 DOI: 10.11901/1005.3093.2023.270

研究论文

本期目录 | 过刊浏览

时效处理对Fe-12Mn-8Al-1C-3Cu轻质钢的组织演变和力学性能的影响

刘加晓¹^,², 胡晓¹^,², 丁桦¹^,²(

)

^1.东北大学材料科学与工程学院沈阳 110819
^2.东北大学辽宁省轻量化用关键金属结构材料重点实验室沈阳 110819

Effect of Aging Treatment on Microstructure Evolution and Mechanical Properties of Fe-12Mn-8Al-1C-3Cu Lightweight Steel

LIU Jiaxiao¹^,², HU Xiao¹^,², DING Hua¹^,²(

)

^1.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
^2.Key Laboratory of Lightweight Structural Materials, Liaoning Province, Northeastern University, Shenyang 110819, China

引用本文:

刘加晓, 胡晓, 丁桦. 时效处理对Fe-12Mn-8Al-1C-3Cu轻质钢的组织演变和力学性能的影响[J]. 材料研究学报, 2024, 38(5): 356-364.
Jiaxiao LIU, Xiao HU, Hua DING. Effect of Aging Treatment on Microstructure Evolution and Mechanical Properties of Fe-12Mn-8Al-1C-3Cu Lightweight Steel[J]. Chinese Journal of Materials Research, 2024, 38(5): 356-364.

全文: PDF(15503 KB) HTML

摘要:

对中锰轻质钢进行不同时间的时效处理，研究了时效时间对其微观组织演变和力学性能的影响。结果表明，时效处理时间对析出物有显著的影响。时效时间短于30 min时，在奥氏体基体内析出大量调幅分解生成的弥散分布的晶内κ'碳化物。随着时效时间的延长，除了在晶内析出κ'碳化物，在晶间也发生共析反应在晶界处形成κ-碳化物，构成(α-铁素体+晶间κ-碳化物)片层组织。晶内κ'碳化物的生成使钢的强度提高，但是晶间κ-碳化物的析出使其塑性显著降低。与长时时效相比，短时时效使钢的强度显著提高，还使其保持较高的伸长率，使其具有更优异的综合力学性能。时效30 min的钢，其抗拉强度为1031 MPa，屈服强度为784 MPa，伸长率为41.08%，强塑积为42.35 GPa·%。

关键词 ：金属材料, 轻质钢, 时效处理, 组织演变, 应变硬化, 位错滑移

Abstract：

By aging treatment of a medium manganese lightweight steel at 550^oC, the evolution of its microstructure and mechanical properties was analyzed. The results indicate that aging treatment has a significant impact on precipitates. When the aging time is less than 30 minutes, a large number of intragranular κ'-carbides formed by spinodal decomposition, which distributed dispersedly in the austenite matrix. As the aging time increases, besides the intragranular κ'-carbides, intergranular κ-carbides are also formed at grain boundaries through eutectoid reactions as a layered structure of α ferrite and κ-carbide. Intragranular κ'-carbides greatly increase the strength, but intergranular κ-carbides significantly reduce the ductility of the steel. Compared with long-time aging, the strength of the steel can be significantly increased by short-time aging, while the steel still maintains a high elongation with better overall mechanical properties. Among them, the good performance is achieved for the steel after aging for 30 minutes, namely a tensile strength of 1031 MPa, yield strength of 784 MPa, an elongation of 41.08%, and a product of strength and elongation of 42.35 GPa·%.

Key words： metallic materials lightweight steel aging treatment microstructural evolution strain hardening dislocation slip

收稿日期: 2023-05-30

ZTFLH:

TG142.1

基金资助:国家自然科学基金(U1760205)

通讯作者: 丁桦，教授，dingh@smm.neu.edu.cn，研究方向为高性能材料的开发及组织性能控制

Corresponding author: DING Hua, Tel: (024)23604263, E-mail: dingh@smm.neu.edu.cn

作者简介: 刘加晓，男，1998年生，硕士

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表1 实验钢的实际成分(质量分数，%)

图1 Fe-12Mn-8Al-1C-3Cu钢的形变热处理流程图(CR：冷轧；HR：热轧；WQ：水冷)

图2 Fe-12Mn-8Al-1C-3Cu钢在550℃时效不同时间后的XRD谱

图3 Fe-12Mn-8Al-1C-3Cu钢在550℃时效不同时间后的显微组织

表2 时效不同时间后奥氏体晶粒的平均尺寸

图4 Fe-12Mn-8Al-1C-3Cu钢在550℃时效不同时间后的TEM形貌

图5 实验钢在550℃时效不同时间后的工程应力-工程应变曲线和力学性能

图6 实验钢在550℃时效10min后不同量变形后的变形组织TEM形貌

图7 实验钢时效300 min后的EBSD分析

图8 实验钢的应变硬化率与真应变的关系

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