Integration of spray-formed AISI H13 overspray powder in additive manufacturing to enable a circular ecosystem

M R L Zwicker, N S Tiedje, T Dahmen, V K Nadimpalli
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Abstract

Overspray powder is a bi-product of the spray forming process and is commonly considered as scrap material. This study, however, assessed the feasibility of the use of spray-formed AISI H13 overspray as powder feedstock for LPBF as part of a circular economy concept. The overspray powder presented a suitable particle size distribution for LPBF applications and showed the capability of being printed crack free. X-ray diffraction was used to show that ferritic/austenitic overspray powder transformed into a martensitic austenitic microstructure in the as-printed conditions. Furthermore, texture analysis revealed a preferred crystallographic orientation in <100> parallel to the build direction for martensite while the retained austenite presents a preferred orientation in <110> along the build direction.
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将喷射成形的 AISI H13 过喷粉末集成到增材制造中,实现循环生态系统
过喷粉末是喷射成型工艺的副产品,通常被视为废料。然而,本研究评估了将喷射成形的 AISI H13 过喷粉末作为低压成型工艺的粉末原料的可行性,这是循环经济概念的一部分。过喷粉末的粒度分布适合 LPBF 应用,并显示出无裂纹印刷的能力。X 射线衍射显示,铁素体/奥氏体过喷粉末在印刷条件下转变为马氏体奥氏体微观结构。此外,纹理分析表明,马氏体的优先结晶取向是与构建方向平行的<100>,而保留奥氏体的优先取向是沿构建方向的<110>。
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