摘要: |
以1mm厚Ti-6Al-4V合金薄板为对象,运用光学金相显微镜、电子探针、扫描电子显微镜、氮氢氧联合分析仪、显微维氏硬度计,研究了特定累积线能量下90°弯曲角弯折区显微组织。结果表明,弯折区组织与累积线能量输入有关,当累积线能量在适当范围时,材料堆积增厚,极表层出现轻微复熔铸态组织,上层为板条马氏体α′,中层为针状马氏体α′,底层为长大粗化的(α+β)组织;距表层约0.2mm范围吸收间隙元素强烈致使硬度急剧提高并呈明显梯度;累积线能量输入过大,弯折区出现大面积复熔铸态组织并伴有裂纹产生。 |
关键词: 钛合金;激光弯曲;累积线能量;显微组织;间隙元素 |
基金项目: |
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Laser Bending Microstructures of Ti-6Al-4V Titanium Alloy |
Yan Xiang Li Hu Duan Peng Xie Huijuan
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China Sanjiang Aerospace Group Hongyang Machinery Plant
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Abstract: |
The structures and properties of laser bending at the angle of 90°with accumulative line energy (ALE) in Ti-6Al-4V sheets for thickness of 1mm were investigated by the means of metallurgical microscope, EPMA, scanning electron microscope (SEM), apparatus for determination of oxygen hydrogen and nitrogen, micro hardness tester. The results show that the structures of the heated area are related to the input of ALE as such: with an appropriate reach of ALE, material accumulation appears in heated area, slight remelting foundry structure in the skin layer, lath martensite α′ in the upper layer, plate martensite in the middle layer, and open grain structure (α+β) in the base layer. Obvious hardness profile appears at 0.2mm below the skin layer, while remelting foundry structure and crack appear all over with too much ALE. |
Key words: titanium alloy;laser bending;accumulate line energy (ALE);microstructure;clearance element |