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论文:2020,Vol:38,Issue(5):1025-1029 |
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引用本文： |
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张霜银, 索涛, 李玉龙. SEM原位加载研究激光增材制造TC4合金变形破坏机制[J]. 西北工业大学学报 |
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ZHANG Shuangyin, SUO Tao, LI Yulong. In-Situ SEM Study on Deformation and Failure Mechanism of TC4 Titanium Alloy by Laser Additive Manufacturing[J]. Northwestern polytechnical university |
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| SEM原位加载研究激光增材制造TC4合金变形破坏机制 |
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| 张霜银, 索涛, 李玉龙 |
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| 西北工业大学 航空学院, 陕西 西安 710072 |
| 摘要: |
| 利用扫描电镜的原位拉伸台研究了激光增材制造TC4钛合金沿晶粒生长方向（L）和垂直于晶粒生长方向（T）拉伸过程中的变形机理。结果表明沉积态拉伸过程中显微组织主要沿与拉伸方向呈约45°的α，β两相界面开裂；随着流动应力的增加，微裂纹数量增多，试样表面在载荷作用下出现起伏错动，直至破坏。L方向原始β晶界上没有明显的变化，T方向观察到沿晶界开裂的微裂纹，这与T方向的塑性比L方向差的结果相一致。热处理后由于α板条变宽，α相内出现滑移带，锻造态则是在等轴α相上出现了大量的滑移带。 |
| 关键词:
增材制造
钛合金
原位拉伸
变形机理
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| In-Situ SEM Study on Deformation and Failure Mechanism of TC4 Titanium Alloy by Laser Additive Manufacturing |
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| ZHANG Shuangyin, SUO Tao, LI Yulong |
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| School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China |
| Abstract: |
| The in-situ tensile test of the field emission scanning electron microscope was used to study the deformation mechanism of the TC4 titanium alloy manufactured by laser additive manufacturing along the L direction (grain growth direction) and T direction (perpendicular to the grain growth direction). The test results show that during the tensile process, as deposited specimen mainly cracks along the interfaces of α and β which is 45 ° to the tensile direction. With the increase of load, the cracking increases. The surface of the sample fluctuates until breaks. There is no obvious change in the prior β grain boundary in L direction. The microcracks along grain boundaries were observed in T direction, which is consistent with the result that the plasticity in the T direction is less than that in L direction. After heat treatment, due to the increase of α lath width compared with the as-deposition, slip bands were observed in α phase. However, a large number of slip bands appear on the equiaxed α phase of the forged specimen. |
| Key words:
additive manufacturing
titanium alloy
in-situ tension test
deformation mechanism
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| 收稿日期: 2020-01-20
修回日期:
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| DOI: 10.1051/jnwpu/20203851025 |
| 基金项目: 国家自然科学基金青年项目（11502215）资助 |
| 通讯作者:
Email： |
| 作者简介: 张霜银(1976-),女,西北工业大学工程师,主要从事增材制造材料的显微组织与力学行为研究。
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| 张霜银 在本刊中的所有文章 |
| 索涛 在本刊中的所有文章 |
| 李玉龙 在本刊中的所有文章 |
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