时效态<strong>Fe-Mn-Al-C</strong>钢的性能和变形机制

doi:10.11901/1005.3093.2020.239

材料研究学报

2021, Vol. 35

Issue (3): 184-192 DOI: 10.11901/1005.3093.2020.239

研究论文

本期目录 | 过刊浏览

时效态Fe-Mn-Al-C钢的性能和变形机制

王萍(

), 郭爱民, 侯清宇, 郭云侠, 黄贞益(

), 光剑锋

安徽工业大学冶金工程学院马鞍山 243000

Properties and Deformation Mechanism of Aged Fe-Mn-Al-C Steel

WANG Ping(

), GUO Aimin, HOU Qingyu, GUO Yunxia, HUANG Zhenyi(

), GUANG Jianfeng

School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243000, China

引用本文:

王萍, 郭爱民, 侯清宇, 郭云侠, 黄贞益, 光剑锋. 时效态Fe-Mn-Al-C钢的性能和变形机制[J]. 材料研究学报, 2021, 35(3): 184-192.
Ping WANG, Aimin GUO, Qingyu HOU, Yunxia GUO, Zhenyi HUANG, Jianfeng GUANG. Properties and Deformation Mechanism of Aged Fe-Mn-Al-C Steel[J]. Chinese Journal of Materials Research, 2021, 35(3): 184-192.

全文: PDF(18031 KB) HTML

摘要:

采用OM、SEM、XRD、EBSD以及TEM等手段分析时效温度对Fe-30Mn-9Al-0.9C-0.45Mo钢中奥氏体的晶粒尺寸和力学性能的影响。结果表明:时效处理对Fe-30Mn-9Al-0.9C-0.45Mo钢的组织和性能有较大的影响。在450℃时效的实验钢其抗拉强度为863 MPa、断后伸长率为56.1%、强塑积达到48.4 GPa·%，比固溶态有显著的提高；在500℃时效后钢中κ-碳化物的析出量增加，呈点状分布，且奥氏体晶粒明显长大，屈服强度和抗拉强度都有所提高。在550℃时效过程中发生DO3→B2连续转变，钢的屈服强度提高但是塑性明显降低。拉伸变形后的实验钢表现出平面滑移特征：在钢中可见明显的高密度位错墙和微带结构。

关键词 ：金属材料, Fe-Mn-Al-C钢, 时效温度, 奥氏体晶粒, 微带

Abstract：

The effect of aging temperature on austenite grain size and mechanical properties of Fe-30Mn-9Al-0.9C-0.45Mo steel were investigated by OM, SEM, XRD, EBSD and TEM. The results show that the aging treatment has a great influence on the microstructure and properties of Fe-30Mn-9Al-0.9C-0.45Mo steel. After aging treatment at 450℃ the tensile strength of the steel is 863 MPa, the elongation after fracture is 56.1%, and the strong plastic product is 48.4 GPa·%, indicating a significant improvement compared with the solid solution treated ones; After aging temperature at 500℃ the amount of the dot-shaped κ-carbide precipitates increases , the austenite grains grow significantly with the increase of ageing temperature and the yield strength and tensile strength increase. During the aging process at 550℃ DO3→B2 continuous transformation occurred, and the yield strength of the steel increased, but the plasticity decreased significantly. After tensile deformation high density dislocation wall and microstrip structure can be observed, which are plane slip characteristics.

Key words： metallic materials Fe-Mn-Al-C steel aging temperature austenite grain microband

收稿日期: 2020-06-17

ZTFLH:

TG142.1

基金资助:国家自然科学基金(51674004)

作者简介: 黄贞益，教授，huangzhenyi@ahut.edu.cn，研究方向为新一代钢铁材料开发及性能控制
王萍，女，1967年生，副教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.239 或 https://www.cjmr.org/CN/Y2021/V35/I3/184

图1 在不同温度时效12 h后实验钢的显微组织

图2 试验钢不同温度时效后奥氏体晶粒尺寸分布图

图3 EBSD表征在不同温度时效后实验钢的相分布

图4 不同时效温度下奥氏体、铁素体质量分数和XRD谱

图5 550℃时效后钢中铁素体析出相形貌和XRD谱

表1 实验钢在不同温度时效12 h后的力学性能

图6 时效钢的工程应力-应变曲线和力学性能随时效温度的变化

图7 试验钢拉伸断口形貌

图8 实验钢在不同温度时效后的KAM图

表2 实验钢拉伸变形后的KAM分布、平均KAM值以及位错密度

图9 450℃时效钢拉伸变形后位错结构的TEM像

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