激光增材连接TC4-DT钛合金的组织及力学性能
Structure and mechanical properties of TC4-DT titanium alloy by laser additive joining
查看参考文献31篇
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文摘
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采用激光增材连接技术对"X"型坡口TC4-DT钛合金锻件进行连接,利用OM和SEM对连接后TC4-DT钛合金基材、热影响区和连接区三个区域的宏微观组织形貌进行表征分析;采用维氏硬度计测量三个区域的显微硬度;采用万能试验机和摆锤冲击仪对不同取样类型的试样进行室温拉伸和冲击实验。结果表明:激光增材连接区与基体形成致密的冶金结合;显微硬度分布从基材到连接区呈递增趋势;随着拉伸试样中连接区占比的降低,TC4-DT钛合金的强度表现为先升高后降低,而塑性却呈现降低的趋势;冲击韧性akU均在55 J/cm~2以上,U型缺口开口方向对连接区冲击韧性影响较大,对结合区冲击韧性无明显影响。 |
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其他语种文摘
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TC4-DT titanium alloy forgings with X-type groove were joined by laser additive joining technology. OM and SEM were used to characterize the macro and micro morphology of TC4-DT titanium alloy base metal,heat affected zone and joining zone. The microhardness of the three regions was measured by Vickers hardness tester. The tensile and impact tests of different samples were carried out at room temperature with universal testing machine and pendulum impactor. The results show that there is a dense metallurgical bond between the joining zone and the base metal. Distribution of microhardness from the base metal to the joining zone shows an increasing trend. The strength of TC4-DT alloy increases first and then decreases with the decrease of the proportion of the joining zone in tensile specimen, while the plasticity decreases. The impact toughness akU is above 55 J/cm~2. The position of U-shaped notch opening has a great effect on the impact toughness of the joining zone but not the bond zone. |
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来源
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材料工程
,2023,51(5):27-35 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2022.000612
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关键词
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激光增材连接
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TC4-DT钛合金
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显微组织
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力学性能
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地址
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1.
北京航空航天大学, 大型金属构件增材制造国家工程实验室, 北京, 100191
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北京航空航天大学材料科学与工程学院, 北京, 100191
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北京航空航天大学前沿科学技术创新研究院, 北京, 100191
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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国家重大科技专项
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国家自然科学基金
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文献收藏号
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CSCD:7480419
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