Development and characterization of AISI 316L micro parts produced by metal powder hot embossing

In molding, geometric variation of molded parts is inevitable since the parts have a thermal history, including expansion and shrinkage, during the molding process. Shrinkage induces variation between the designed dimensions and locations of features on molded parts while the parts are cooled. Characterization of the variation is necessary to ensure dimensional and location integrity. Hot embossing and injection molding were performed in order to assess variation. Measurements were made using a Measurescope (MM-22, Nikon Corp., Kawasaki, Japan). The measured locations and dimensions were compared to estimates obtained using a simple model based on the linear thermal expansion coefficients (CTE) of the molded materials. The measured and the estimated shrinkage from hot embossing were incorporated in the fabrication of microtiter plate-based polymer microfluidic platforms.

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Mechanical characterization of the AISI 316L alloy exposed to boriding process

DYNA ◽

10.15446/dyna.v87n213.82924 ◽

2020 ◽

Vol 87 (213) ◽

pp. 34-41 ◽

Cited By ~ 1

Author(s):

Ricardo Andrés García-León ◽

Jose Martinez-Trinidad ◽

Ivan Campos-Silva ◽

Wilbert Wong-Angel

Keyword(s):

Sliding Wear ◽

Standard Procedure ◽

Indentation Test ◽

Boride Layer ◽

Aisi 316L ◽

Low Carbon ◽

X Ray Diffraction ◽

Boriding Process ◽

Wear Tests

In this study, the powder-pack boriding process on low-carbon stainless steel was carried out at 1273 K for 4 h of exposure to obtain a layer around ~57 μm conformed by FeB, Fe2B, and others alloying elements. Firstly, the presence of iron borides formed on the surface of borided AISI 316L alloy was confirmed by optical microscopy combined with the X-ray diffraction analysis. After, the sensed Vickers indentation test was performed on the iron boride layer to estimate the behavior of hardness and Young’s modulus. Sliding wear tests on the borided AISI 316L alloy were performed according to the ASTM G133-05 standard procedure, with the following conditions: distances of 50 and 150 m, normal loads of 5 and 20 N, and a sliding speed of 30 mm/s. Finally, the results showed that the presence of FeB-Fe2B improves the resistance to wear around 41 times compared to the untreated material.

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Fabrication and Characterization of Aluminium Matrix Composites by High Velocity Oxy-Fuel Thermal Spraying

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.585.317 ◽

2012 ◽

Vol 585 ◽

pp. 317-321

Author(s):

Gagndeep Singh ◽

Hitesh Vohra ◽

Manpreet Kaur

Keyword(s):

Metal Matrix Composites ◽

Metal Powder ◽

High Velocity ◽

Metal Matrix ◽

Aluminum Matrix Composites ◽

Matrix Composites ◽

Bulk Metal ◽

Hvof Spray ◽

Spray Technique

The High Velocity Oxy-fuel (HVOF) spray technique has been used by many researchers to deposit composite coatings, but there is less available literature discussing the fabrication of bulk metal matrix composites by this technique. In the current study, aluminum matrix composites with dispersions of alumina (Al2O3) and silicon carbide (SiC) particulates are fabricated by HVOF spray technique. The study comprises the steps of providing the substrate, preparing a mixed powder comprising a first metal powder as a matrix and a second metal powder comprising a ceramic and selected as reinforcement. The detailed procedures to prepare the bulk by using the same are reported. An in-depth characterization of the composite formed has been performed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Hardness of the composite formed is measured on Vickers microhardness tester. This study showed the possibility of fabricating bulk metal matrix composites of larger size by HVOF spray technique.

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