A comparative study using water atomized and gas atomized powder in laser powder bed fusion – Assessment of the fatigue performance

Richter, Julia; Torrent, Christof Johannes Jaime; Krochmal, Marcel; Wegener, Thomas; Vollmer, Malte; Niendorf, Т.

doi:10.1016/j.ijfatigue.2022.107468

Cited by 6 publications

(10 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the present study, five different Fe conditions were investigated. Further details on all materials considered are provided in previous works [27,[29][30][31][32]. All conditions experienced very distinctive thermal and mechanical histories.…”

Section: Raw Materials and Manufacturingmentioning

confidence: 99%

“…It was shown that these differences lead to different microstructural and mechanical properties [29]. Furthermore, for the sake of direct comparison, the GA powder as well as the WA powder were processed using the same PBF-LB/M parameters [27]. In PB-AM, several factors can highly impact the material's final appearance, as will be discussed in this work.…”

Section: Raw Materials and Manufacturingmentioning

confidence: 99%

“…Finally, the fracture su faces of the specimens strained until failure were characterized using the SEM mentione above, operated at a nominal voltage of 20 kV. For postmortem characterization, the spe imens were ground and polished again and analyzed by means of EBSD in these region As already mentioned before, the material conditions regarded herein have already bee investigated in other studies; thus, the authors refer to [27,[29][30][31][32] for further manufactu ing data and material characteristics.…”

Section: In Situ Tensile Testmentioning

confidence: 99%

“…This can be done, amongst others, by lowering the cost of the feedstock. Here, water atomization (WA) is more cost-efficient than gas atomization (GA) and is the subject of recent studies, e.g., [27]. Also, the use of wider powder size distributions and recycled powders can lower the material costs.…”

Section: Introductionmentioning

confidence: 99%

“…In the current review-like study, five different conditions of commercially pure (cp) iron are analyzed and directly compared: Two different cp-Fe feedstocks (i.e., GA and WA) processed via PBF-LB/M (cf. [27]); two conditions processed via PBF-EB/M but using different build plate sizes (cf. [29]); as well as hot-rolled cp-Fe.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Influence of Various Processing Routes in Additive Manufacturing on Microstructure and Monotonic Properties of Pure Iron—A Review-like Study

Torrent,

Sajadifar,

Gerstein

et al. 2024

Metals

Self Cite

View full text Add to dashboard Cite

Additive manufacturing processes have attracted broad attention in the last decades since the related freedom of design allows the manufacturing of parts with unique microstructures and unprecedented complexity in shape. Focusing on the properties of additively manufactured parts, major efforts are made to elaborate process-microstructure relationships. For instance, the inevitable thermal cycling within the process plays a significant role in microstructural evolution. Various driving forces contribute to the final grain size, boundary character, residual stress state, etc. In the present study, the properties of commercially pure iron processed on three different routes, i.e., hot rolling as a reference, electron powder bed fusion, and laser powder bed fusion, using different raw materials as well as process conditions, are compared. The manufacturing of the specimens led to five distinct microstructures, which differ significantly in terms of microstructural features and mechanical responses. Using optical and electron microscopy as well as transmission electron microscopy, the built specimens were explored in various states of a tensile test in order to reveal the microstructural evolution in the course of quasistatic loading. The grain size is found to be most influential in enhancing the material’s strength. Furthermore, substructures, i.e., low-angle grain boundaries, within the grains play an important role in terms of the homogeneity of strain distribution. On the contrary, high-angle grain boundaries are found to be regions of strain localization. In summary, a holistic macro-meso-micro-nano investigation is performed to evaluate the behavior of these specific microstructures.

show abstract