Effects of HIP on microstructural heterogeneity, defect distribution and mechanical properties of additively manufactured EBM Ti-48Al-2Cr-2Nb

Seifi, Mohsen; Salem, Ayman A.; Satko, Daniel P.; Ackelid, U.; Semiatin, S. L.; Lewandowski, John J.

doi:10.1016/j.jallcom.2017.09.163

Cited by 112 publications

(52 citation statements)

References 51 publications

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“…78,79 Other applications can be to monitor the efficiency of pore closure in HIP treatment and the effect of heat treatments on pores. 14,52,53,80 Surface roughness or topography AM parts require surface roughness assessment, but traditional tools such as tactile and optical profilometers and laser scanners work only on the exterior surfaces of parts, and often only in lines or on flat surfaces. 81,82 It was shown previously that individual line profiles in CT images can be related to surface roughness, especially useful for complex parts such as struts in lattices.…”

Section: Deformation or 4d Microctmentioning

confidence: 99%

“…One of the latest developments is helical scanning as demonstrated in Seifi et al, 14 which effectively removes some types of image artifacts and allows acquisition of single volumes of elongated samples, instead of stitching multiple scans. Another new development, which can be very useful in practice, is offaxis CT: rotation around an arbitrary selected point in the sample.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

X-Ray Microcomputed Tomography in Additive Manufacturing: A Review of the Current Technology and Applications

Plessis

Yadroitsev

Yadroitsava

et al. 2018

3D Printing and Additive Manufacturing

375

147

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X-ray microcomputed tomography (microCT) has become an established method of testing and analyzing additively manufactured parts in recent years, being especially useful and accurate for dimensional measurement and porosity analysis. While this nondestructive analysis method is gaining traction among additive manufacturing (AM) researchers and engineers, the capabilities of the method are not yet fully appreciated and are still being developed. This review aims to summarize the many diverse ways this technique has been applied to AM, including new and specialized applications. Examples are shown of many of these newly developed methods, while also discussing the practicality and limitations of each. The review ends with perspectives on the most time-and cost-effective ways to make use of microCT for various AM applications from R&D up to industrial production, with suggestions for scan strategies for different types of analyses.

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Section: Deformation or 4d Microctmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

X-Ray Microcomputed Tomography in Additive Manufacturing: A Review of the Current Technology and Applications

Plessis

Yadroitsev

Yadroitsava

et al. 2018

3D Printing and Additive Manufacturing

375

147

View full text Add to dashboard Cite

show abstract

“…Among many deficiencies inherent to additively manufacturing (AM), the lack-of-fusion pores (LFPs) are perhaps most detrimental to metals' fatigue resistance, as they are slit-shaped with high aspect ratio, serving as strong stress risers. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Due to the AM's layer-by-layer fabrication strategy, the LFPs tend to be aligned and concentrated near the interlayer fusion regions, 15 creating strong anisotropy in the parts fatigue strength. The processing parameters of AM platforms can be adjusted to minimize the size and volume fraction of the defects.…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatments on pore morphology and microstructure of laser additive manufactured parts

Zhang

Meng

Shao

et al. 2019

Mat Design & Process Comms

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The slit‐shaped, lack‐of‐fusion pores (LFPs) persistent in the additively manufactured (AM) metals are detrimental to their fatigue resistance due to the associated stress concentrations at the edges. Postbuild treatments, such as hot isostatic pressing (HIP), are routinely used to eliminate pores resulting in, however, inconsistent improvements in fatigue performance. This work critically examines the effectiveness of HIP to eliminate such pores in AM Ti‐6Al‐4V. In addition, conventional heat treatment (HT) is proposed as a candidate remedial process to alleviate the harmful effects of the LFPs. Specifically, the spheroidization effect of HT on the sharp edges of the LFPs is investigated. Lastly, the effect of HT and HIP on the microstructure is carefully analyzed, safeguarding the beneficial refined microstructure of AM Ti‐6Al‐4V.

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“…Durch eine Herstellung über die additive Formgebung kann diese Größenbarriere aufgrund der kleinen Schmelzpoolgröße im additiven Herstellprozess auf die Dimension des Bauraums der 3D Drucker erhöht und gleichzeitig eine größere Formenvielfalt erreicht werden. Bei dieser Herstellungsart kommt es jedoch aufgrund der Pulverqualität und der noch mangelnden Erfahrung hinsichtlich der Prozessparameter zur Ausbildung von unterschiedlichen Defekten [8][9][10]. Um den zyklischen Belastungen innerhalb der geplanten Lebensdauer eines Triebwerks standzuhalten, dürfen die Gefüge jedoch keinesfalls größere Defekte aufweisen, als dies bei konventionell erzeugten Bauteilen der Fall ist.…”

Section: Introductionunclassified

Mikrostrukturelle Charakterisierung einer pulvermetallurgisch hergestellten mehrphasigen TiAl-Legierung

Burtscher

Pürstl

Schloffer

et al. 2019

Berg Huettenmaenn Monatsh

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Zusammenfassung: Intermetallische Titanaluminide werden bei erhöhten Temperaturen als Turbinenschaufeln in Flugzeugtriebwerken, als Laufräder in Turboladern sowie als Ventile im Rennsport eingesetzt. Um neue Herstellungswege zu nutzen und endkonturnahe 3D gedruckte Teile produzieren zu können, müssen geeignete Pulver für additive Fertigungsprozesse verfügbar sein. Dazu wurden zwei vielversprechende Legierungsvarianten herangezogen und entsprechende Pulver hergestellt. Anschließend wurden die Pulver heißisostatisch verdichtet. Um die Qualität der Pulver sicherzustellen und mögliche mikrostrukturelle Inhomogenitäten des Materials auszuschließen, erfolgte eine Defektanalyse mittels Lichtmikroskopie in Kombination mit Rasterelektronenmikroskopie. Dazu wurden einzelne Defekte im Lichtmikroskop mittels Härteeindrücken markiert und deren lokale chemische Information über detaillierte Flächenscans im Rasterelektronenmikroskop ermittelt. Die Ergebnisse dieser Untersuchung können dazu verwendet werden, Fehlerquellen bei der Herstellung sensibler Titanaluminid-Pulver zu vermeiden und so die Qualität der erzeugten Bauteile zu steigern.

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Effects of HIP on microstructural heterogeneity, defect distribution and mechanical properties of additively manufactured EBM Ti-48Al-2Cr-2Nb

Cited by 112 publications

References 51 publications

X-Ray Microcomputed Tomography in Additive Manufacturing: A Review of the Current Technology and Applications

X-Ray Microcomputed Tomography in Additive Manufacturing: A Review of the Current Technology and Applications

Effect of heat treatments on pore morphology and microstructure of laser additive manufactured parts

Mikrostrukturelle Charakterisierung einer pulvermetallurgisch hergestellten mehrphasigen TiAl-Legierung

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