Different deposition strategies to enhancemicrostructural and mechanical properties ofcold-spray applications
Başlık çevirisi mevcut değil.
- Tez No: 708862
- Danışmanlar: PROF. MARİO GUAGLİANO, UZMAN ANNA VALENTE
- Tez Türü: Yüksek Lisans
- Konular: Metalurji Mühendisliği, Metallurgical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2020
- Dil: İngilizce
- Üniversite: Politecnico di Milano
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 103
Özet
Özet yok.
Özet (Çeviri)
Cold spray (CS) is a convenient and cost-effective alternative to standard repair and maintenance procedures. The uniqueness of CS rests in its potential to form a coating, provide structural repair, and even create a near-net-shaped part at temperatures far below the melting point of the feedstock powders, thus preventing or reducing several detrimental high-temperature reactions which are common in thermal spray processes. This nature of CS makes it appealing as a process for surface coatings or structural repair while preserving the material's unique properties. In this study, microstructural and mechanical characteristics of multiple alternative deposition strategies on stainless steel (SS) 316L coatings produced by a low pressure cold spray (LPCS) system are investigated. The difference of this study from other studies is the usage of the LPCS system to spray high strength material with low pressure and low temperature rather than common high pressure cold spray (HPCS) systems. The first study addresses to investigate the performance of a novel LPCS device by characterizing CS coatings deposited with different combinations of spraying parameters; gas pressure, gas temperature, traverse gun speed, and powder feed rate. While the second study aims to investigate the effect of spray gun feed-powder injection angle on the characterization of SS 316L CS coatings deposited with a commercial LPCS device. In the first study, the results demonstrated that high gas pressure and high gas temperature play a major role in producing well-bonded and dense coatings while traverse gun speed and powder feed rate have an effect on the coatings' thickness and profile shape. The results of the second study showed that deposition strategy must be designed with 0° or 180° spray gun feed-powder injection angle for addressing the optimal deposition quality in terms of symmetrical and uniform coating profiles.
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