Scholarlink

<p>To address issues in 205C aluminum alloy components formed through wire and arc additive manufacturing (WAAM), such as coarse grains, increased porosity, and performance anisotropy, this study used CMT + P composite arc as the heat source and designed three deposition paths—S, Z, and O—to fabricate the corresponding components under room temperature conditions. The wire feed speed was set at 7.0&#xa0;m·min⁻<sup>1</sup>, and the shielding gas flow rate was 25.0 L·min⁻<sup>1</sup>. The results indicate that the primary phase in all additively manufactured samples across the three paths is α-Al, with a minor presence of the strengthening phase CuAl₂. The XRD main peak positions and relative peak intensities are largely consistent among the paths, while the macroscopic textures exhibit weak and similar characteristics. Microhardness was measured using the Vickers hardness test, with hardness values obtained via diagonal length measurement. Stability was assessed based on a statistical distribution of 75 indent points arranged in a 15-row × 5-column matrix. The results show that group O demonstrates an uneven microhardness distribution; however, it has the highest average microhardness (79.2 HV) and average tensile strength. Nevertheless, microstructural heterogeneity and local strain result in a small elongation (7.5%). Tensile tests were conducted following GB/T 228.1–2021, with two specimens tested per orientation, and the average values were used to characterize mechanical properties. The Group S exhibits a grain size of 46.20&#xa0;μm and the fewest microstructural defects, yet yields a lower average hardness (69.7 HV) and average tensile strength (244&#xa0;MPa). Its elongation is 8.1%. In contrast, the Group Z features a refined grain size of approximately 34&#xa0;μm, the most uniform macrostructure, the finest and most uniform CuAl₂ precipitates, the most stable microhardness profile, and the smallest differences between transverse and longitudinal mechanical properties. This group achieves an average tensile strength of 260&#xa0;MPa and an average elongation of 10.7%, demonstrating the best comprehensive performance by ensuring both higher strength and the largest elongation and property stability. This study provides a quantitative basis for deposition path selection in the CMT + P WAAM of 205C aluminum alloy.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Influence of deposition strategy on the microstructure and mechanical properties of CMT + P WAAM-based 205C aluminum alloy

  • 期刊论文

  • 发表日期：

    2026年2月6日

查看全文
  • Peng Yin,
  • Zekai Wang,
  • Lin Wang,
  • Zhu Ming

摘要

To address issues in 205C aluminum alloy components formed through wire and arc additive manufacturing (WAAM), such as coarse grains, increased porosity, and performance anisotropy, this study used CMT + P composite arc as the heat source and designed three deposition paths—S, Z, and O—to fabricate the corresponding components under room temperature conditions. The wire feed speed was set at 7.0 m·min⁻1, and the shielding gas flow rate was 25.0 L·min⁻1. The results indicate that the primary phase in all additively manufactured samples across the three paths is α-Al, with a minor presence of the strengthening phase CuAl₂. The XRD main peak positions and relative peak intensities are largely consistent among the paths, while the macroscopic textures exhibit weak and similar characteristics. Microhardness was measured using the Vickers hardness test, with hardness values obtained via diagonal length measurement. Stability was assessed based on a statistical distribution of 75 indent points arranged in a 15-row × 5-column matrix. The results show that group O demonstrates an uneven microhardness distribution; however, it has the highest average microhardness (79.2 HV) and average tensile strength. Nevertheless, microstructural heterogeneity and local strain result in a small elongation (7.5%). Tensile tests were conducted following GB/T 228.1–2021, with two specimens tested per orientation, and the average values were used to characterize mechanical properties. The Group S exhibits a grain size of 46.20 μm and the fewest microstructural defects, yet yields a lower average hardness (69.7 HV) and average tensile strength (244 MPa). Its elongation is 8.1%. In contrast, the Group Z features a refined grain size of approximately 34 μm, the most uniform macrostructure, the finest and most uniform CuAl₂ precipitates, the most stable microhardness profile, and the smallest differences between transverse and longitudinal mechanical properties. This group achieves an average tensile strength of 260 MPa and an average elongation of 10.7%, demonstrating the best comprehensive performance by ensuring both higher strength and the largest elongation and property stability. This study provides a quantitative basis for deposition path selection in the CMT + P WAAM of 205C aluminum alloy.