more>>在线期刊
more>>新闻发布
more>>相关下载
友情连接

应变速率对Fe-20Mn-3Al-3Si钢的力学性能及其微观组织的影响

沈书成, 谢盼, 刘春雨，伍翠兰
  • 摘要
  • 参考文献
  • 相关文章

2023年 第42卷 第2期: 1000-6281（2023）02-161-10     下载地址：

应变速率对Fe-20Mn-3Al-3Si钢的力学性能及其微观组织的影响

沈书成, 谢盼, 刘春雨，伍翠兰

(1. 湖南大学材料科学与工程学院高分辨电镜中心，湖南 长沙  410082；2. 海南大学皮米电镜中心，海南 海口  570228)

摘   要  分别采用分离式Hopkinson压杆和MTS Landmark电液伺服疲劳试验机对冷轧退火态Fe-20Mn-3Al-3Si 相变诱导塑性(TRIP, transformation induced plasticity) 钢进行900 s-1~3500 s-1范围内的动态冲击实验和应变速率为3×10-3 s-1准静态压缩实验。采用X射线衍射技术(XRD, X-ray diffraction)、电子背散射衍射技术(EBSD, electron backscatter diffraction)和透射电镜(TEM, transmission electron microscope)等对变形试样的微观组织结构进行表征。结果表明，该TRIP钢表现出正应变速率敏感性，且动态冲击变形的屈服强度明显高于准静态变形的屈服强度。无论是在动态冲击样品还是准静态压缩样品中，都可以观察到大量的ε-马氏体和α′-马氏体，且动态冲击样品中ε-马氏体和α′-马氏体的体积分数明显低于准静态变形样品中ε-马氏体和α′-马氏体的体积分数。在动态冲击样品中，除了能观察到大量的ε-马氏体和α′-马氏体以外，也可以观察到大量的{101(_)1}εT孪晶和{101(_)2}εT孪晶，并且，{101(_)1}孪晶和α′-马氏体之间的取向关系为(110)α' // (0002)εT，<111>α' // <2110>εT。

关键词  高锰钢；动态冲击；TRIP效应；应变速率；ε-马氏体孪晶

中图分类号：TG146.2; TG115.21; TG113.12; TG115.2    文献标识码：A    doi:10.3969/j.issn.1000-6281.2023.02.006

 

The effect of strain rate on the mechanical properties and microstructure of deformed Fe20Mn3Al3Si steel

SHEN Shu-cheng1，XIE Pan2，LIU Chun-yu1，WU Cui-lan1*

(1. Center for High-Resolution Electron Microscopy, College of Materials Science and Engineer,

Hunan University,Changsha Hunan 410082; 2. Pico Electron Microscopy Center, College of Materials Science and Engineering, Hainan University, Haikou Hainan 570228,China)

Abstract    The dynamic impact test and quasi-static compression test of cold-rolled and annealed Fe20Mn3Al3Si transformation induced plasticity (TRIP) steel was conducted by the split-hopkinson pressure bar (SHPB) at high strain rates ranging from 650 s-1 to 3800 s-1 and the MTS landmark tester at strain rate of 3 × 10-3 s-1, respectively. The microstructure of samples before and after impact was characterized using electron back scattering diffraction technology (EBSD) and transmission electron microscopy (TEM). The results reveal thatthe TRIP steel shows a positive strain rate during dynamic impact deformation, and the yield strength of dynamic impact deformation is obviously higher than that of quasi-static deformation. A large amount of ε-martensite and α'-martensite were observed in both dynamic impact samples and quasi-static compression samples. The volume fraction of ε-martensite and α' -martensite in dynamic impact samples is significantly lower than that in quasi-static deformation samples. In addition to a large number of ε-martensite and α' -martensite, a large number of {101(_)1}εTtwins and {101(_)2}εTtwins were also observed in dynamic impact samples. Moreover, the fixed orientation relationship between {101(_)1}εTtwins and α' -martensite can be expressed as (110)α' //(0002)εT, <111>α' // <2110>εT.

Keywords     high-Mn steel; dynamic impact; TRIP effect; strain rate;ε-martensite twin

 

“全文下载请到同方知网，万方数据库或重庆维普等数据库中下载！”