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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure Evolution and Mechanical Property Anisotropy of Wire and Arc-Additive-Manufactured Wall Structure Using ER2319 Welding Wires
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Microstructure Evolution and Mechanical Property Anisotropy of Wire and Arc-Additive-Manufactured Wall Structure Using ER2319 Welding Wires

机译：使用ER2319焊丝电线和电弧添加制造墙壁结构的微观结构演化与机械性能各向异性

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摘要

ER2319 welding wires were used to fabricate a wall structure using CMT-PAdv-based wire and arc additive manufacturing (WAAM). Heat treatment was used after the WAAM process. The microstructure and mechanical property anisotropy before and after the heat treatment were studied. There were three areas with different grain morphology along building direction in the as-deposited wall structure. Microstructure difference was clear between interlayer regions and intra-layer regions both in as-deposited and heat-treated state. Netlike second phases became discontinuous after heat treatment, but pores and Fe-rich phases basically unchanged. Mechanical property presented isotropy before heat treatment because alpha-Al with lower Cu content had low resistance on crack initiation or growth and crack mainly grew via netlike second phases which had no directionality. Mechanical property presented anisotropy after heat treatment because alpha-Al was strengthened and brittle Fe-rich phases which concentrated in interlayer regions played a leading role in crack initiation. Moreover, the tensile loading force along the building direction was perpendicular to interlayer regions. Thus, mechanical properties in building direction were lower than that in deposition direction.
机译：ER2319焊丝用于使用基于CMT PAdv的焊丝和电弧添加剂制造（WAAM）制造墙壁结构。在WAAM工艺之后进行热处理。研究了热处理前后的显微组织和力学性能各向异性。在沉积态的壁结构中，有三个区域沿构建方向具有不同的晶粒形态。在沉积态和热处理态下，层间区和层内区的显微结构差异明显。网状第二相在热处理后变得不连续，但孔隙和富铁相基本不变。由于Cu含量较低的α-Al对裂纹萌生或扩展的阻力较低，且裂纹主要通过无方向性的网状第二相长大，因此热处理前力学性能呈现各向同性。热处理后的力学性能呈现各向异性，因为α-Al得到了强化，而集中在层间区域的脆性富铁相在裂纹萌生中起主导作用。此外，沿建筑方向的拉伸载荷垂直于层间区域。因此，建筑方向的力学性能低于沉积方向。

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