Micro MIM Japan

2,Mar,2021

Technical Newsletter vol.26 : Paper review; AM co-researching work using FDMet

Paper review; AM co-researching work using FDMet

   

    

  We have published literature to Materials, regarding the FEMet additive manufacturing, with Prof. Hiroshi Ito, Graduate School of Organic Materials Science, Yamagata University, in May 2020 and Jan 2021. In this issue, we will introduce an overview of those researching work.

 

Background

 

    Metal additive manufacturing (Metal AM) realises any design of forming from 3D-CAD data as we published the technical newsletter before. There are various method of forming the component in metal AM, but in our co-researching work, fused deposition of metals (FDMet) is deployed. The FDMet employs filament for forming material, which has a diameter of 1.7 mm wire shape. This filament is made from metal powder and binder mixture and Micro MIM Japan and Taisei Kogyo were responsible for this filament development.

 

 

Forming parameter and mechanical properties

 

    It is well known that any type of metal AM components have anisotropy properties. In these papers, the clear relationship between the layer stacking direction, layer thickness and tensile properties. The stacking layer is perpendicular to the tensile direction, the tensile strength is lower than the stacking layer is parallel to the tensile direction. Also 0.1 mm the layer thickness specimen gives higher density and mechanical strength than the 0.3 mm specimen.

 

3D printer

Fig. 1 Overview of the 3D-printing system

(T. Kurose et al., Influence of the Layer Directions on the Properties of 316L Stainless Steel Parts Fabricated through Fused Deposition of Metals,Materials)

 

Feedstock effects

 

     Unlike the MIM process, there is no compaction process of the feedstock in the FEMet, therefore, the filament properties affect significantly the mechanical properties in the final sintered component. In these researches, 2 types of stainless steel (316L and 17-4PH) with the powder size distribution class were deployed. However, the density is increased in 17-4PH paper even the FEMet parameters were the same as the 316L work. This is due to our filament development. The density increment will lead to mechanical property improvement surely in  the  metal AM process. In FDMet filament, it is required not only the density improvement but also the the processability, chemical and physical stabilities. Our µ-MIM® technology will enhance the possibility of the Metal AM manufacturing field too.

 

2 Cross section SEM images of the filament

Fig. 2 Cross section SEM images of the filament (Left; stainless steel 316L, Right; 17-4PH)

(Left; T. Kurose et al., Influence of the Layer Directions on the Properties of 316L Stainless Steel Parts Fabricated through Fused Deposition of Metals,Materials

Right; Y. Abe et al., Effect of Layer Directions on Internal Structures and Tensile Properties of 17-4PH Stainless Steel Parts Fabricated by Fused Deposition of Metals.)

 

 

 

Reference

Influence of the Layer Directions on the Properties of 316L Stainless Steel Parts Fabricated through Fused Deposition of Metals,Materials, 13, 2493, 12 pages, (2020).

DOI: 10.3390/ma13112493

Effect of Layer Directions on Internal Structures and Tensile Properties of 17-4PH Stainless Steel Parts Fabricated by Fused Deposition of Metals. Materials,14, 243, (2021).

DOI: 10.3390/ma14020243

 

 

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COLUMN

  

 

 

     Hello. I am Nakagawa from the quality control department. I am responsible for optical dimensional measurement in both trial and mass production. I started playing the guitar 2 years ago and foam my own band to play rock music. Unfortunately, my band already broke up and now I am interested in jazz and blues. I am practising hard to be able to enjoy jazz and blues and whenever I could play the new phrase, the music makes my heart sing. Also whenever I could measure the difficult specimen, I feel delightful.

    

   

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