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Influence of build direction and heat treatment on the microstructure and tensile characteristics of cold metal transfer based wire arc additive manufactured SS 304L
CIRP Journal of Manufacturing Science and Technology ( IF 4.8 ) Pub Date : 2023-09-14 , DOI: 10.1016/j.cirpj.2023.08.013
Sandeep O S , Basil Kuriachen

Wire arc additive manufacturing has gained a noble position in the field of manufacturing metallic structures. This paper aims to evaluate the effect of build direction and heat treatment on the tensile behaviour along three different orientations: transverse (T), longitudinal (L), and diagonal (D). Microstructural investigations have been conducted to identify the microstructural features caused by CMT-based WAAM and its relation to mechanical properties. The results revealed a fine microstructure with austenite and ferrite phases and the formation of ferrite morphologies. For the untreated and treated specimens, respectively, the ferrite percentage was greater in the middle of the samples and is 12.29% and 11.21%. The WAAM components exhibited good tensile properties with a clear indication of anisotropic behaviour with respect to building direction. The diagonal specimen from WAAM and heat-treated WAAM resulted in better tensile properties. Additionally, it demonstrates a significant rise in Young's modulus value compared to the standard value for SS304L and other directional specimens in both treated and untreated circumstances. The percentage of anisotropy in WAAM and heat-treated specimen ranges from 6.42% to 57.76%. Fine microstructure creation and directional grain growth have produced resistance to slip movement in different orientations in different ways, resulting in the anisotropic behaviour of WAAM fabricated components.



中文翻译:

构建方向和热处理对基于冷金属过渡电弧增材制造的 SS 304L 的显微组织和拉伸特性的影响

电弧增材制造在金属结构制造领域获得了崇高的地位。本文旨在评估构建方向和热处理对三个不同方向拉伸行为的影响:横向 (T)、纵向 (L) 和对角线 (D)。已经进行了微观结构研究,以确定基于 CMT 的 WAAM 引起的微观结构特征及其与机械性能的关系。结果揭示了具有奥氏体和铁素体相的精细微观结构以及铁素体形态的形成。对于未处理和处理过的样品,样品中间的铁素体百分比分别较高,分别为 12.29% 和 11.21%。WAAM 组件表现出良好的拉伸性能,并清楚地表明相对于构建方向的各向异性行为。WAAM 和热处理 WAAM 的对角线样品具有更好的拉伸性能。此外,它还表明,在经过处理和未经处理的情况下,与 SS304L 和其他定向样本的标准值相比,杨氏模量值显着上升。WAAM 和热处理样本的各向异性百分比范围为 6.42% 至 57.76%。精细微观结构的产生和定向晶粒生长以不同的方式产生了对不同方向滑移运动的抵抗力,从而导致 WAAM 制造的部件具有各向异性行为。它表明,在经过处理和未经处理的情况下,与 SS304L 和其他定向样本的标准值相比,杨氏模量值显着上升。WAAM 和热处理样本的各向异性百分比范围为 6.42% 至 57.76%。精细微观结构的产生和定向晶粒生长以不同的方式产生了对不同方向滑移运动的抵抗力,从而导致 WAAM 制造的部件具有各向异性行为。它表明,在经过处理和未经处理的情况下,与 SS304L 和其他定向样本的标准值相比,杨氏模量值显着上升。WAAM 和热处理样本的各向异性百分比范围为 6.42% 至 57.76%。精细微观结构的产生和定向晶粒生长以不同的方式产生了对不同方向滑移运动的抵抗力,从而导致 WAAM 制造的部件具有各向异性行为。

更新日期:2023-09-15
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