黄崇权,刘奋成,王晓光.CMT电弧增材制造GH4169合金的组织和拉伸性能[J].精密成形工程,2019,11(4):89-96.
HUANG Chong-quan,LIU Fen-cheng,WANG Xiao-guang.Microstructure and Tensile Property of GH4169 Superalloy Fabricated by CMT-arc Additive Manufacturing[J].Journal of Netshape Forming Engineering,2019,11(4):89-96. |
| CMT电弧增材制造GH4169合金的组织和拉伸性能 |
| Microstructure and Tensile Property of GH4169 Superalloy Fabricated by CMT-arc Additive Manufacturing |
| 投稿时间：2019-06-04 修订日期：2019-07-10 |
| DOI：10.3969/j.issn.1674-6457.2019.04.012 |
| 中文关键词: 冷金属过渡 GH4169合金 CMT电弧增材制造 组织 拉伸性能 |
| 英文关键词: cold metal transfer GH4169 superalloy CMT-WAAM microstructure tensile property |
| 基金项目:国家自然科学基金（51565041）；江西省自然科学基金（20171BAB206004）；江西省教育厅科研项目（GJJ170581） |
|
| 摘要点击次数: 3142 |
| 全文下载次数: 2144 |
| 中文摘要: |
| 目的 研究冷金属过渡CMT电弧增材制造GH4169合金单道多层薄壁试样的组织和拉伸性能。方法 利用CMT增材制造成形系统进行GH4169合金的单壁墙增材制造试验，分析了成形薄壁试样的组织演化和力学性能，讨论了柱状晶组织的各向异性以及均匀化处理对合金力学性能的影响。结果 成形试样的显微组织主要为γ相和共晶（γ+Laves）相，试样沿沉积方向具有[100]择优取向。枝晶组织随着沉积层数的增加变得粗大，枝晶间距变大且二次枝晶臂变小，Laves相的取向特征越明显。从底部区域到顶部区域，试样枝晶臂间距λ1从13.76 μm增大到23.27 μm。沿柱状晶生长方向的抗拉强度最大，约为774 MPa；而沿电弧行走方向的抗拉强度随沉积层数的增加逐渐减小，断后伸长率逐渐增大，最大抗拉强度约为763 MPa。1170 ℃固溶+时效处理后，原粗大柱状晶形成较小的多边形晶粒，成形试样组织的均匀性提高，沉积方向最大抗拉强度为1222 MPa，沿电弧行走方向最大抗拉强度为1085 MPa。结论 CMT增材制造GH4169合金组织特征与激光增材制造的试样基本一致，热处理前后CMT成形GH4169合金试样抗拉强度均小于激光立体成形，但伸长率更大。 |
| 英文摘要: |
| The paper aims to study microstructure and tensile property of GH4169 superalloy single run and multi-layer thin walled samples formed by cold metal transfer wire arc additive manufacturing (CMT-WAAM). Thin-walled samples of GH4169 superalloy were formed by the system of cold metal transfer wire arc additive manufacturing. The microstructure evolution and mechanical properties of the thin-walled samples were analyzed. The influences of the anisotropy of columnar crystal structure and homogenization on the mechanical properties of the alloy were discussed. The microstructures of the formed samples were mainly γ phase, Laves phase and eutectic (γ + Laves) phase, and the sample had [100] preferred orientation along the deposition direction. With the increase of the number of deposition layers, the dendritic structure became thicker and thicker, the spacing between dendrites and the two dendrite arm were getting smaller and smaller, and the orientation characteristics of Laves phase became more and more obvious. The maximum dendrite arm spacing increased from 13.76 μm in the bottom region to 23.27 μm in the top region. The tensile strength of the specimen along the columnar crystal growth was the largest, it was about 774 MPa; the tensile strength along the arc direction gradually decreased with the increase of the number of sedimentary layers, and the elongation at post increased gradually, and the maximum tensile strength was about 763 MPa. After solid solution + aging at 1170 ℃, the coarse columnar crystals were broken into small columnar crystals. The uniformity of the microstructure was improved, the maximum tensile strength in the deposition direction was 1222 MPa, and the maximum tensile strength in the horizontal direction was 1085 MPa. The microstructural characteristics of GH4169 alloy formed by CMT are basically the same as the samples formed by the laser. The tensile strength of GH4169 alloy formed by CMT before and after heat treatment are lower than that of the samples by laser solid forming, but the elongation is higher. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
渝公网安备 50010702501719号