4.2 Article

Influence of microstructural defects and the surface topography on the fatigue behavior of additively-subtractively manufactured specimens made of AISI 316LEinfluss mikrostruktureller Defekte und der Oberflachentopographie auf das Ermudungsverhalten additiv-subtraktiv gefertigter Proben aus AISI 316L

期刊

MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK
卷 52, 期 5, 页码 561-577

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/mawe.202000266

关键词

Laser-based powder bed fusion; process-induced defects; subtractive manufacturing; fatigue behavior; AISI 316L

资金

  1. Rhineland Palatinate Advanced Materials Engineering (AME)
  2. Projekt DEAL

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The study found that subtractive manufacturing had minimal impact on fatigue behavior, but different laser-based powder bed fusion process parameters significantly affected fatigue strength. Additionally, subtractive finishing had a significant influence on fatigue properties of defect-free continuously cast reference specimens.
As additive manufacturing offers only low surface quality, a subsequent machining of functional and highly loaded areas is required. Thus, a sound knowledge of the interrelation between the additive and subtractive manufacturing process as well as the resulting mechanical properties is indispensable. In this work, specimens were manufactured by using laser-based powder bed fusion (L-PBF) with substantially different sets of process parameters as well as subsequent grinding (G) or milling (M). Despite the substantially different surface topographies, the fatigue tests revealed only a slight influence of the subtractive manufacturing on the fatigue behavior, whereas the different laser-based powder bed fusion process parameters led to pronounced changes in fatigue strength. In contrast, a significant influence of subtractive finishing on the fatigue properties of the defect-free continuously cast (CC) reference specimens was observed. This can be explained by a dominating influence of process-induced defects in laser-based powder bed fusion material, which overruled the influence of surface machining. However, although both laser-based powder bed fusion parameter sets resulted in substantial defects, one set yielded similar fatigue strength compared to continuously cast specimens.

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