| 引用本文: | 陈欢,孙新军,王小江,肖书洋.高锰奥氏体低温钢力学性能及Hall-Petch关系的研究[J].材料科学与工艺,2018,26(5):11-18.DOI:10.11951/j.issn.1005-0299.20170425. |
| CHEN Huan,SUN Xinjun,WANG Xiaojiang,XIAO Shuyang.Mechanical properties and Hall-Petch relationship of high manganese austenitic cryogenic steel[J].Materials Science and Technology,2018,26(5):11-18.DOI:10.11951/j.issn.1005-0299.20170425. |
|
| 摘要: |
| 高锰奥氏体低温钢作为一种经济型低温钢材料，具有非常巨大的发展空间.为进一步研究晶粒尺寸对高锰奥氏体低温钢的影响，本文对其进行了不同工艺的固溶处理，测试了不同晶粒尺寸实验钢的室温拉伸及低温冲击性能, 通过扫描电镜(SEM)、背散射电子衍射(EBSD)等方法进行表征并计算其Hall-Petch关系式.-196 ℃冲击实验结果表明，高锰奥氏体低温钢拥有良好而稳定的超低温冲击性能，且其超低温冲击性能不随晶粒尺寸的增加而发生变化.经计算实验钢屈服强度所对应的Hall-Petch常数Ky为7.27 MPa·mm0.5，明显小于其他被研究的奥氏体高锰钢.进一步计算拉伸过程中不同真应变ε对应的Hall-Petch常数K(ε)，发现在拉伸过程中，受TWIP效应产生的变形孪晶影响，K(ε)值随应变量的增加而增加；当真应变达到0.3时，组织内变形孪晶不再继续生成，加工硬化过程不再进行，K(ε)也达到极大值.
|
| 关键词: Hall-Petch关系 高锰奥氏体低温钢 晶粒尺寸 TWIP效应 形变孪晶 低温韧性 |
| DOI：10.11951/j.issn.1005-0299.20170425 |
| 分类号:TG141 |
| 文献标识码:A |
| 基金项目:国家高技术研究发展计划(863计划)资助项目(2015AA03A501). |
|
| Mechanical properties and Hall-Petch relationship of high manganese austenitic cryogenic steel |
|
CHEN Huan1, SUN Xinjun1, WANG Xiaojiang1,2, XIAO Shuyang3
|
|
(1.Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China; 2.School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; 3. School of Materials Science and Engineering, University of Science & Technology Beijing, Beijing 100083, China)
|
| Abstract: |
| High manganese austenitic low-temperature steel as an economical low-temperature steel, there is a huge space for development. Different researchers on the fine grain strengthening of high manganese austenitic steel have different opinions. In order to research the effects of grain size on the properties of high manganese austenitic low temperature steel, different solution treatments were processed, the tensile tests and low temperature impact properties with different grain sizes were tested. The experimental steels were characterized by scanning electron microscope (SEM), electron backscatter diffraction (EBSD) and the Hall-Petch relationship was calculated. The -196 ℃ impact test results show that the high manganese austenitic cryogenic steel has a great cryogenic impact performance, and the cryogenic impact performance doesn't change with the increase of grain size. The Hall-Petch constant Ky corresponding to the yield strength of the experimental steel is 7.27 MPa·mm0.5, significantly smaller than that of other austenitic steels. The reason is that the carbon content of the experimental steel is low, resulting in a lower shear modulus G. At the same time, the carbon as a gap solid solution directly affects the dislocation density ρG near the grain boundary, and the Ky value is proportional to ρG0.5 and G, so the lower carbon content of the test steel leads to a smaller Ky value. The Hall-Petch constant K(ε)corresponding to the different true strain ε during tensile tests is further calculated. It is found that K(ε) is affected by the TWIP effect. When the true strain reaches 0.3, deformation twins are no longer to produce, the value of K(ε) reaches the maximum.
|
| Key words: Hall-Petch relationship high manganese austenite cryogenic steel grain size TWIP effect deformation twinning cryogenic toughness |
