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| 纳米氧化物合金化对低合金高强钢熔敷金属组织和性能的影响 |
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陈翠欣1,2,3, 薛海涛1, 陈翠玲1,2, 丁静1,2, 韩啸1, 唐昊1
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1.河北工业大学 材料科学与工程学院, 天津 300130;2.天津市材料层状复合与界面控制技术重点实验室, 天津 300130;3.河北工业大学 能源装备材料技术研究院, 天津 300130
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| 摘要: |
| 针对新型钢铁材料焊缝熔敷金属的韧化问题，采用直接氧化物合金化这一新型方法，通过焊接材料实现了纳米氧化物颗粒向液态熔池中的过渡，研究了纳米氧化物对低合金高强钢焊缝熔敷金属组织性能的影响. 结果表明，纳米Al2O3，TiO2和稀土氧化物的添加使焊缝中生成了大量弥散分布、尺寸为0.2～0.8 μm的细小球形复合夹杂物，有效提高了针状铁素体的形核能力，形成了大量板条束尺寸约1～2 μm、且均匀分布的针状铁素体. 纳米氧化物的添加使熔敷金属的冲击韧性显著提高，尤其是添加二氧化钛和稀土氧化物的焊缝，其-20℃冲击韧性达到了150 J/cm2以上，比无氧化物添加的焊缝冲击韧性提高67%. |
| 关键词: 纳米氧化物 夹杂物 低合金高强钢 针状铁素体 冲击韧性 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（51304059）；国家留学基金资助项目（CSC NO.201406705011） |
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| Effect of nano oxide on microstructure and mechanical properties of low alloy high strength steel welds |
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CHEN Cuixin1,2,3, XUE Haitao1, CHEN Cuiling1,2, DING Jing1,2, HAN Xiao1, TANG Hao1
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1.School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China;2.Tianjin Key Laboratory of Laminating Fabrication and Interface Control Technology for Advanced Materials, Hebei University of Technology, Tianjin 300130, China;3.Research Institute for Equipment Materials, Hebei University of Technology, Tianjin 300130, China
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| Abstract: |
| Aimed at the improvement of mechanical properties for new generation iron and steel welds, a new method, oxide metallurgy was adopted. The adopted oxides were added into liquid welding pool through electrode and the effects on microstructure and mechanical properties were studied. The results showed that a large quantity of spherical complex inclusions with the mean size of 0.2~0.8 μm were found in Al2O3, TiO2 and Ce2O3 added weld deposits. These inclusions effectively promote the formation of acicular ferrite with mean size of 1~2 μm. The impact toughness of weld deposits increase evidently compared to that of no oxide added case, especially for TiO2 and Ce2O3 added weld deposits which have impact toughness of about 150 J/cm2 (-20℃), increasing by 67%. |
| Key words: nano oxide complex inclusion low alloy high strength steel acicular ferrite impact toughness |
