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Direct selective laser sintering of ...
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Das, Suman.
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Direct selective laser sintering of high performance metals: Machine design, process development and process control.
紀錄類型:
書目-語言資料,印刷品 : Monograph/item
正題名/作者:
Direct selective laser sintering of high performance metals: Machine design, process development and process control./
作者:
Das, Suman.
面頁冊數:
307 p.
附註:
Source: Dissertation Abstracts International, Volume: 60-12, Section: B, page: 6336.
Contained By:
Dissertation Abstracts International60-12B.
標題:
Engineering, Materials Science. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9956974
ISBN:
9780599605640
Direct selective laser sintering of high performance metals: Machine design, process development and process control.
Das, Suman.
Direct selective laser sintering of high performance metals: Machine design, process development and process control.
- 307 p.
Source: Dissertation Abstracts International, Volume: 60-12, Section: B, page: 6336.
Thesis (Ph.D.)--The University of Texas at Austin, 1998.
Biasing the temperature of the feedstock powder via radiant preheat prior to and during SLS processing was shown to be beneficial. Preheating the powder significantly influenced the flow and wetting characteristics of the melt.
ISBN: 9780599605640Subjects--Topical Terms:
1017759
Engineering, Materials Science.
Direct selective laser sintering of high performance metals: Machine design, process development and process control.
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Source: Dissertation Abstracts International, Volume: 60-12, Section: B, page: 6336.
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Supervisor: Joseph J. Beaman.
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Thesis (Ph.D.)--The University of Texas at Austin, 1998.
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Biasing the temperature of the feedstock powder via radiant preheat prior to and during SLS processing was shown to be beneficial. Preheating the powder significantly influenced the flow and wetting characteristics of the melt.
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Several processing requirements differentiate direct SLS of metals from SLS of polymers or polymer coated powders. Perhaps the most important distinguishing characteristic is the regime of high temperatures involved in direct SLS of metals.
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The development of machine, processing and control technologies during this research effort enabled successful production of a number of integrally canned test specimens in Alloy 625 (InconelRTM 625 superalloy) and Ti-6Al-4V alloy.
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This dissertation describes the development of an advanced manufacturing technology known as Direct Selective Laser Sintering (Direct SLS). Direct SLS is a laser based rapid manufacturing technology that enables production of functional, fully dense, metal and cermet components via the direct, layerwise consolidation of constituent powders. Specifically, this dissertation focuses on a new, hybrid net shape manufacturing technique known as Selective Laser Sintering/Hot Isostatic Pressing (SLS/HIP). The objective of research presented in this dissertation was to establish the fundamental machine technology and processing science to enable direct SLS fabrication of metal components composed of high performance, high temperature metals and alloys.
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During this work, it was conclusively established that powder cleanliness is of paramount importance for successful layerwise consolidation of metal powders by direct SLS. Sequential trials were conducted to establish optimal bake-out and degas cycles under high vacuum. These cycles agreed well with established practices in the powder metallurgy industry.
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A study of some of the important transport mechanisms in direct SLS of metals was undertaken to obtain a fundamental understanding of the underlying process physics. This study not only provides an explanation of phenomena observed during SLS processing of a variety of metallic materials but also helps in developing selection schemes for those materials that are most amenable to direct SLS processing.
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The overall goal of this research was to develop direct SLS of metals armed with a fundamental understanding of the underlying physics. The knowledge gained from experimental and analytical work is essential for three key objectives: machine design, process development and process control. (Abstract shortened by UMI.)
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http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9956974
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