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金属学报  2019, Vol. 55 Issue (8): 951-957    DOI: 10.11900/0412.1961.2019.00014
  本期目录 | 过刊浏览 |
C含量对Fe-Mn-Al-C低密度钢组织和性能的影响
陈兴品1(),李文佳1,任平1,曹文全2,刘庆1
1. 重庆大学材料科学与工程学院 重庆 400044
2. 钢铁研究总院特殊钢研究所 北京 100081
Effects of C Content on Microstructure and Properties ofFe-Mn-Al-C Low-Density Steels
Xingpin CHEN1(),Wenjia LI1,Ping REN1,Wenquan CAO2,Qing LIU1
1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
2. Special Steel Department of Central Iron & Steel Research Institute, Beijing 100081, China
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摘要: 

采用EBSD、TEM、XRD和万能试验机等对比研究了4种Fe-30Mn-10Al-xC (x=0.53、0.72、1.21、1.68,质量分数,%)低密度钢固溶处理后的微观组织与力学性能。结果表明,随着C含量的增加,奥氏体的体积分数逐渐增多,显微结构由铁素体/奥氏体双相组织逐渐演变为单相奥氏体组织,钢的强度不断增加,而延伸率则先增加后减小。统计分析表明,奥氏体的应变协调能力高于铁素体,双相钢随着奥氏体含量的增加,延展性明显增加,强度略微增加;而对于单相奥氏体钢,随着C含量的增加,屈服强度明显增加,延展性变差,加工硬化能力显著降低,这是由于钢中κ′碳化物的析出造成的。

关键词 低密度钢Fe-Mn-Al-C合金力学性能奥氏体铁素体    
Abstract

The lightweight Fe-Mn-Al-C steels (so-called low-density steels) have received great attentions as promising candidate for automobile structure applications due to their excellent combination of density reduction, mechanical properties and corrosion resistance. In previous studies, most examinations of the Fe-Mn-Al-C alloys focused on the deformation mechanisms and the relationship between the microstructure and mechanical properties. It is well known that chemical composition, especially C content, which enhances strength as the interstitial element and reduces the density of steels, plays an important role in the control of microstructure and performance. However, the influence of C element in the alloy with high Mn content is barely studied. In this work, the effects of C content on microstructure and mechanical properties of four Fe-30Mn-10Al-xC (x=0.53, 0.72, 1.21, 1.68, mass fraction, %) alloys were studied by EBSD, TEM, XRD and universal testing machine. The results show that with the increase of C content, the amount of austenite gradually increases and the ferrite/austenite dual-phase microstructure transforms into single phase austenite. In addition, the strength increases monotonously, while the elongation increases and then decreases ultimately with increasing C content. Statistical analysis reveals that the strain coordination capacity of austenite is higher than that of ferrite. Therefore, with the increase of austenite content, the ductility of the dual-phase steel remarkably increases, while the strength increases slightly. For single austenite steels, the yield strength increases but the elongation and work hardening ability decrease with increasing C content, which is related to the precipitation of κ′ carbides.

Key wordslow-density steel    Fe-Mn-Al-C alloy    mechanical property    austenite    ferrite
收稿日期: 2019-01-17     
ZTFLH:  TG142.1  
基金资助:国家自然科学基金项目((Nos.51871062 and 51421001));中央高校基本科研业务费专项资金项目(No.2018CDJDCL0019)
通讯作者: 陈兴品     E-mail: xpchen@cqu.edu.cn
Corresponding author: Xingpin CHEN     E-mail: xpchen@cqu.edu.cn
作者简介: 陈兴品,男,1970年生,教授,博士

引用本文:

陈兴品,李文佳,任平,曹文全,刘庆. C含量对Fe-Mn-Al-C低密度钢组织和性能的影响[J]. 金属学报, 2019, 55(8): 951-957.
Xingpin CHEN, Wenjia LI, Ping REN, Wenquan CAO, Qing LIU. Effects of C Content on Microstructure and Properties ofFe-Mn-Al-C Low-Density Steels. Acta Metall Sin, 2019, 55(8): 951-957.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00014      或      https://www.ams.org.cn/CN/Y2019/V55/I8/951

图1  不同C含量实验用钢的EBSD图

C content

%

γ phase

%

α phase

%

Grain size

μm

0.5352.844.313.3
0.7272.326.011.3
1.2199.70.28.9
1.6899.70.19.5
表1  实验用钢的相含量与晶粒尺寸
图2  含C量为1.68%的实验用钢的TEM像及选区电子衍射花样
图3  不同C含量实验用钢的XRD谱

C content

%

2θ

(°)

Lattice parameter

nm

γαaγaα
0.5342.8644.290.3660.290
0.7242.7944.270.3660.290
1.2142.69-0.367-
1.6842.52-0.368-
表2  4种C含量实验用钢的XRD实验数据
图4  不同C含量实验用钢的拉伸曲线及力学性能
图5  含C量为0.53%的实验用钢中奥氏体与铁素体两相变形前后的EBSD图
图6  含C量为0.53%的钢变形前后单个晶粒真应变的分布图
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