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Post-build healing of pores in metal AM: is HIP efficient?

9/3/2018

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micro-XCT reconstruction of Ti-6Al-4V powder with porosity trapped within powder particles shown in red [1]
​Post-build hot iso-static pressing (HIP) has become a common practice for the closure of some types of defects in AM metal components. Assuming your products lend themselves to HIPing, can this post-processing method get rid of all porosity?

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Particles properties inducing porosity in metal AM

2/3/2018

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Images of gas atomized MAR-M-247 powder, sample1, size range: 45–106um [ref 15]
Some defects found in parts built using AM are related to processing parameters or to the composition of alloys optimised for more conventional, slow-cooling manufacturing process. These defects – such as porosity or cracking – can sometimes be healed by post-processing such as hot isostatic pressing (HIP). Yet, the formation of pores during AM is also linked to the quality of virgin powder.

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A novel micro-additive manufacturing technique for flexible electronics printing

23/2/2018

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PictureSchematic of the new setup [1] by N. Holt et al.

​​Researchers in the AM3 lab, at the university of Arkansas, have demonstrated the potential for a new low-costs powder bed AM technique for the manufacturing of micro-components made of low-melting temperature (~600C) powders [1]. Unlike Selective Laser Sintering and Selective Laser Melting that employ a laser beam scanned across the powder bed, the new concept, referred to as MAPS for Micro-Array Powder Sintering, employs arrays of micro-heaters as energy sources. This proof-of-concept could increase build speeds and reduce powder waste and running costs.


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Particles characteristics impact on granular media behaviour in powder bed fusion AM

16/2/2018

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Powder bed fusion additive manufacturing promotes material efficiency as a unique selling point. Unfused particles are in effect recyclable after processing operation and reused [link]. Powder characteristics however tend to vary following different stages of the AM process and these variations could affect powder behaviour and final part quality. Specifically, feedstock quality must be tightly controlled due to their influence on powder flow and packing density.
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Operability, functionality and maintenance of LB-PBFAM

9/2/2018

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[2] laser based powder bed fusion AM
There are no fundamental processing differences between laser-based powder bed fusion systems, yet not all machines are created equal. So how do choose and invest in the right equipment? In the first part, we listed what you should be looking for in the hardware equipment. In this second part of a 3-part series, we review different functional and maintenance aspects.

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