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Influence of Interlayer Forced Air Cooling on Microstructure and Mechanical Properties of Wire Arc Additively Manufactured 304L Austenitic Stainless Steel
Steel Research International ( IF 2.2 ) Pub Date : 2021-07-11 , DOI: 10.1002/srin.202100175
Lavinia Tonelli 1 , Ramona Sola 1 , Vittoria Laghi 2 , Michele Palermo 2 , Tomaso Trombetti 2 , Lorella Ceschini 1
Affiliation  

Wire-and-arc additive manufacturing (WAAM) is an innovative technology that involves deposition of subsequent layers of molten materials. Due to the high deposition rates, this technology is suitable for the production of large-scale complex structures. Further enhancement in the productivity can be achieved by an interlayer cooling strategy that reduces idle time between depositions. However, the effect of the interlayer cooling on microstructure and mechanical properties has to be addressed. In this view, the present work compares microstructural features and mechanical properties of WAAM-produced plates of austenitic AISI 304 L, focusing on the effect of both active interlayer air cooling and possible anisotropy induced by the additive process. Microstructural and mechanical characterization was conducted on samples extracted along the longitudinal, transverse, and diagonal directions to the deposition layers of WAAM plates, processed with and without interlayer active cooling. Results showed no remarkable influence of cooling conditions on the microstructure and mechanical properties of WAAM plates, which are indeed affected by the anisotropy induced by the additive process. The observed anisotropy in the elastic modulus, independent from different cooling conditions, was related to the crystallographic texture consequent to the highly oriented microstructure typically induced by the process.

中文翻译:

层间强制空冷对电弧增材制造304L奥氏体不锈钢组织和力学性能的影响

线弧增材制造 (WAAM) 是一项创新技术,涉及后续熔融材料层的沉积。由于沉积速率高,该技术适用于大规模复杂结构的生产。通过减少沉积之间的空闲时间的层间冷却策略,可以进一步提高生产率。然而,必须解决层间冷却对微观结构和机械性能的影响。从这个角度来看,目前的工作比较了 WAAM 生产的奥氏体 AISI 304 L 板的微观结构特征和机械性能,重点是主动层间空气冷却的影响和由添加剂过程引起的可能的各向异性。对沿纵向、横向和对角线方向提取到 WAAM 板的沉积层的样品进行微观结构和机械表征,处理有和没有层间主动冷却。结果表明,冷却条件对 WAAM 板的微观结构和力学性能没有显着影响,这确实受到添加剂过程引起的各向异性的影响。观察到的弹性模量的各向异性,与不同的冷却条件无关,与通常由该过程引起的高度取向的微观结构导致的结晶织构有关。结果表明,冷却条件对 WAAM 板的微观结构和力学性能没有显着影响,这确实受到添加剂过程引起的各向异性的影响。观察到的弹性模量的各向异性,与不同的冷却条件无关,与通常由该过程引起的高度取向的微观结构导致的结晶织构有关。结果表明,冷却条件对 WAAM 板的微观结构和力学性能没有显着影响,这确实受到添加剂过程引起的各向异性的影响。观察到的弹性模量的各向异性,与不同的冷却条件无关,与通常由该过程引起的高度取向的微观结构导致的结晶织构有关。
更新日期:2021-07-11
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