激光增材制造高温合金原位增强钛合金复合材料的组织与力学性能
Microstructure and mechanical properties of superalloy in-situ reinforced titanium alloy composites by laser additive manufacturing
查看参考文献29篇
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文摘
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采用激光选区熔化成形(selective laser melting,SLM)技术制备TCGH(TC4+GH4169)复合材料,探究TCGH钛合金复合材料的最佳成形工艺参数,并研究沉积态试样和热处理试样的显微组织与力学性能。结果表明:TCGH钛合金复合材料的最佳工艺参数为扫描速率900 mm/s、激光功率150 W,致密度达到99.5%以上。GH4169粉末的添加改变了TC4钛合金材料的固态相变行为,沉积态组织呈现明显高温凝固特征,使得逐行扫描搭接和逐层扫描堆积成形特征变得明显,沿打印方向原始粗大柱状β晶粒尺寸明显减小,复合材料抗拉强度提升。与沉积态试样相比,950 ℃热处理后,试样显微组织转变为近等轴组织,同时随着热处理温度上升,第二相的回溶导致复合材料的固溶强化作用占主导地位,使得复合材料抗拉强度和塑性均得到提升。 |
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其他语种文摘
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TCGH(TC4+GH4169)composite material was prepared by selective laser melting(SLM). The optimum forming process parameters of TCGH composite material were investigated,and the microstructure and mechanical properties of as-deposited samples and heat-treated samples were studied. The results show that the optimum process parameters for fabrication of TCGH composite material are scanning speed of 900 mm/s with laser power of 150 W, and density higher than 99.5%. The addition of GH4169 powder changes the solid phase transformation behavior of TC4 titanium alloy material,and the as-deposited structure shows obvious high temperature solidification characteristics,which makes the forming characteristics of progressive scanning overlap and layer-by-layer scanning accumulation obvious. The original coarse columnar β grain size along the printing direction is significantly reduced, and the tensile strength of the composite is improved. Compared with the as-deposited sample,the microstructure of the heat-treated sample is transformed into a near-equiaxed structure. At the same time,with the increase of heat treatment temperature,the dissolution of the second phase leads to the dominant solid solution strengthening effect of the composite material,which improves the tensile strength and plasticity of the composite material. |
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来源
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材料工程
,2024,52(3):33-43 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2023.000378
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关键词
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激光选区熔化
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TC4复合材料
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GH4169
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热处理
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地址
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1.
中国科学技术大学材料科学与工程学院, 沈阳, 110016
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中国科学院金属研究所, 师昌绪先进材料创新中心, 沈阳, 110016
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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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国家自然科学基金资助项目
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中国科学院创新交叉团队项目
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文献收藏号
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CSCD:7686356
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