Characterization of Recrystallization and Second-Phase Particles in Solution-Treated Additively Manufactured Alloy 718

Ariaseta, Achmad; Kobayashi, Satoru; Takeyama, Masao; Wang, Yuting; Imano, Shinya

doi:10.1007/s11661-019-05560-y

Cited by 18 publications

(6 citation statements)

References 19 publications

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“…Therefore, our results suggest that, in LPBF-316L stainless steel, recrystallization is mainly controlled by particle coarsening and heterogeneous nuclei distribution. Thus, LPBF alloys, which frequently contain a fine dispersion of nanoparticles, exhibit a sluggish recrystallization kinetics when compared to a wrough counterpart (for other alloys as well [46]) due to the interaction of nanoparticles with migrating grain boundaries. Our study reports the in-depth characterization of the recrystallization kinetics and the importance of the as-built LPBF microstructure, especially nanoparticles, on this phenomenon.…”

Section: Comparison Of Recrystallization Kinetics Between Lpbf and Conventionally Manufactured Materialsmentioning

confidence: 99%

“…Most works cited above refer to the AISI 316L stainless steel, while the remaining ones refer to Ni-based superalloys. Only two works focus on the recrystallization mechanisms in AISI 316L and IN718 alloys in detail [45,46], where their sluggish kinetics have been assigned to the interaction of high angle boundaries with oxide/silicate nanoparticles. Therefore, further investigations are required to understand whether the microstructure evolution and the recrystallization mechanisms are similar between samples from different alloys or obtained under different LPBF processing conditions.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

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Recrystallization in non-conventional microstructures of 316L stainless steel produced via laser powder-bed fusion: effect of particle coarsening kinetics

et al. 2022

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Alloys processed by laser powder-bed fusion show distinct microstructures composed of dislocation cells, dispersed nanoparticles, and columnar grains. Upon post-build annealing, such alloys show sluggish recrystallization kinetics compared to the conventionally processed counterpart. To understand this behavior, AISI 316L stainless steel samples were constructed using the island scan strategy. Rhodonite-like (MnSiO3) nanoparticles and dislocation cells are found within weakly-textured grains in the as-built condition. Upon isothermal annealing at 1150 °C (up to 2880 min), the nucleation of recrystallization occurs along the center of the melt pool, where nuclei sites, high stored elastic energy, and local large misorientation are found in the as-built condition. The low value of the Avrami coefficient (n = 1.16) can be explained based on the non-random distribution of nucleation sites. The local interaction of the recrystallization front with nanoparticles speeds up their coarsening causing the decrease of the Zener-Smith pinning force. This allows the progression of recrystallization in LPBF alloys, although sluggish. These results allow us to understand the progress of recrystallization in LPBF 316L stainless steel, shedding light on the nucleation mechanisms and on the competition between driving and dragging pressures in non-conventional microstructures. They also help to understand the most relevant microstructural aspects applicable for tuning microstructures and designing new LPBF alloys. Graphical abstract

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Section: Comparison Of Recrystallization Kinetics Between Lpbf and Conventionally Manufactured Materialsmentioning

confidence: 99%

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Recrystallization in non-conventional microstructures of 316L stainless steel produced via laser powder-bed fusion: effect of particle coarsening kinetics

et al. 2022

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“…Three kinds of phases could be identified: 1) Al and O rich particles, presumably aluminum oxide; 2) Ti, Nb and C rich particles, presumably MC carbides ; 3) Nb and Ti rich particles, presumably lave phases [46]. Al and O rich particles are known to have a good thermal stability and have been characterized even after high temperature heat treatments [47]. Selected Area Electron Diffraction (SAED) rings shown in Figure 7 inset that it is composed of really fine crystallites.…”

Section: Tem Investigationsmentioning

confidence: 99%

Investigations of powder reusing on microstructure and mechanical properties of Inconel 718 obtained by additive manufacturing

Paccou

Mokhtari

Keller

et al. 2021

Materials Science and Engineering: A

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Laser powder bed fusion, largely employed for additive manufacturing, induces after each batch a large quantity of remaining powder. This study focuses on the possibility to reuse this remaining powder after a large number of production cycles and on the influence of such reusing on the microstructure and mechanical properties. Inconel 718 parts made from fresh and 50 times reused powder were processed and then characterized in the asbuilt state. The effect of powder reuse on the microstructure was assessed thanks to a multiscale study and the resulting mechanical response was evaluated using both monotonous and cyclic tests. Our results clearly show that despite a better powder flowability for the reused powder, only minor differences between the two investigated materials demonstrating the possibility of high-quality parts production from reused powders.

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“…More recently, post-built annealing treatment were performed on AM metals to improve the material performance through the modification in microstructure and texture. [6,27,28] However, they largely worked on recrystallization in highly alloyed materials (e.g., AISI 316L and IN718 alloys), where the presence of a second phase and composition inhomogeneity, to large extent, retards the grain boundary mobility (i.e., kinetics of recrystallization) and subsequently affects the extent of microstructure and texture evolution. [6,27,28] In addition, the prior studies provide limited information on the effect of post-built annealing treatment on the evolution of grain boundary network.…”

Section: Introductionmentioning

confidence: 99%

Texture and Grain Boundary Network Evolution of Laser Powder Bed Fusion Processed Pure Ni During Post-printing Annealing

Beladi

Torbati-Sarraf

Rohrer

et al. 2022

Metall Mater Trans A

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Commercially pure Ni was additively manufactured using laser powder bed fusion. The printed specimens were then subjected to annealing treatments in a range of 700 °C to 1200 °C to investigate the evolution of the microstructure using electron backscatter diffraction mapping and a five-parameter analysis of the grain boundary character distribution. The post-printing annealing treatment resulted in microstructural changes in respect to grain shape and size, the grain boundary character distribution and the overall texture. However, the extent of these changes strongly depended on the annealing temperature. The grain structure and overall texture changed only modestly when annealed below 900 °C. The grains grew by about 10 pct and this led to a small (≈ 15 pct) increase in the areas of boundaries with low energy (111) planes at the expense of higher energy grain boundary planes with the (001) orientation. Static recrystallization was the dominant microstructure evolution mechanism at annealing temperatures greater than 1000 °C, where new equiaxed grains replaced the initial printed microstructure, enhancing the relative areas of low energy grain boundaries (i.e., $$\sum 3$$ ∑ 3 and $$\sum 9$$ ∑ 9 ) by a factor of more than five. This change increased the population of boundaries with the low energy (111) plane by a factor of five and decreased the strength of the texture by more than 50 pct through twinning. The resultant microstructure is expected to ultimately improve the material properties, where the increase in the relative areas of $$\sum 3$$ ∑ 3 boundaries would enhance the corrosion resistance and fracture toughness of material, and the texture weakening diminishes the anisotropy in mechanical behaviour.

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Characterization of Recrystallization and Second-Phase Particles in Solution-Treated Additively Manufactured Alloy 718

Cited by 18 publications

References 19 publications

Recrystallization in non-conventional microstructures of 316L stainless steel produced via laser powder-bed fusion: effect of particle coarsening kinetics

Recrystallization in non-conventional microstructures of 316L stainless steel produced via laser powder-bed fusion: effect of particle coarsening kinetics

Investigations of powder reusing on microstructure and mechanical properties of Inconel 718 obtained by additive manufacturing

Texture and Grain Boundary Network Evolution of Laser Powder Bed Fusion Processed Pure Ni During Post-printing Annealing

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