Thesis
Investigation of the structure and corrosive properties of additively manufactured stainless steel 316L by binder jetting and supersolidus liquid phase sintering
Master of Science (M.S.), Drexel University
Sep 2016
DOI:
https://doi.org/10.17918/etd-7577
Abstract
Additive Manufacturing(AM) has seen a great deal of growth and adaptation since its emergence in the 1970s. Through AM's constituent techniques freeform fabrication with an unprecedented degree of geometric freedom is possible. Originally reserved for small scale prototyping AM has recently seen a push for application in a production setting, it is of of particular flexibility in material and application is binder. One common material for use in AM is stainless steel 316L due to its wide use in bio-materials, automotive parts, nuclear reactors, and anywhere corrosion resistance in required. Despite is wide application across many materials; the complex interaction of as-printed structures with post-printing processing is not well understood. This is particularly true for complex post printing processes such as supersolidus liquid phase sintering of metals such as 316L with boron. As binder jetting (BJ) provides several potential advantages over other forms of AM further exploration of the effects of BJ on sintering and therefore resultant material properties, such as corrosion resistance, is a promising avenue for improvement of the process. In this study, a range of standard BJ process parameters were employed in order to print various sample geometries with pre-alloyed 316L Stainless steel powder. The resultant structure was then examined with particular attention given to porosity and microstructure. Samples were also subjected to corrosion testing in a sulfuric acid environment in order to clarify how the observed structure would affect the material's performance in extreme environments. It was found that that variation in printing parameters had a quantifiable effect on corrosion resistance.
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Details
- Title
- Investigation of the structure and corrosive properties of additively manufactured stainless steel 316L by binder jetting and supersolidus liquid phase sintering
- Creators
- Christopher P. Allen - DU
- Contributors
- Mitra Taheri (Advisor) - Drexel University (1970-)
- Awarding Institution
- Drexel University
- Degree Awarded
- Master of Science (M.S.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- 125 pages
- Resource Type
- Thesis
- Language
- English
- Academic Unit
- Materials (Science and) Engineering (Metallurgical Engineering) (1970-2026); College of Engineering (1970-2026); Drexel University
- Other Identifier
- 7577; 991014632192204721