Sökning: "γ′ precipitate"

Hittade 5 avhandlingar innehållade orden γ′ precipitate.

1. 1. Alloy Design and Characterization of γ′ Strengthened Nickel-based Superalloys for Additive Manufacturing

   Författare :Jinghao Xu; Johan Moverare; Ru Lin Peng; Eric Jägle; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nickel-based superalloy; Alloy design; Laser powder bed fusion; Cracking susceptibility; Additive manufacturability; Heat treatment; γ′ precipitate; High-temperature mechanical property; Creep.;

   Sammanfattning : Nickel-based superalloys, an alloy system bases on nickel as the matrix element with the addition of up to 10 more alloying elements including chromium, aluminum, cobalt, tungsten, molybdenum, titanium, and so on. Through the development and improvement of nickel-based superalloys in the past century, they are well proved to show excellent performance at the elevated service temperature. LÄS MER

3. 2. Fullerene γ-Cyclodextrin Complexes

   Författare :Thomas Andersson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; C60; a-cyclodextrin; aggregates; FAB LSIMS; Buckminsterfullerene; g-cyclodextrin; b-cyclodextrin; ring-currents; fullerene; host-guest; C70;

   Sammanfattning : The fullerenes, C60 and C70, can form inclusion complexes with .gamma.-cyclodextrin as the host. The complexes are formed by refluxing a water solution of . LÄS MER

4. 3. High-performance Nickel-based Superalloys for Additive Manufacturing

   Författare :Jinghao Xu; Johan Moverare; Ru Peng; Chinnapat Panwisawas; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nickel-based superalloy; Alloy design; Laser powder bed fusion; Cracking susceptibility; Additive manufacturability; Heat treatment; γ′ precipitate; High-temperature mechanical property; Creep; Oxidation;

   Sammanfattning : Additive manufacturing (AM), e.g., laser powder bed fusion (LPBF) technique, has become a powerful manufacturing process for producing metallic components with the advantages of design freedom, net-shape-forming flexibility, product customization, and reduced lead time to market. LÄS MER

5. 4. Evolution of Microstructure in Two Austenitic Alloys at High Temperatures

   Författare :Jenny M Erneman; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; N ; Thermo-Calc; Nb C; gamma prime; DICTRA; APFIM; quantitative metallography; AISI 347; Alloy 800; energy filtered TEM; sigma phase;

   Sammanfattning : A niobium stabilised AISI 347 austenitic stainless steel was investigated after static ageing and creep deformation at temperatures between 500°C and 800°C for times up to 88 000 h. Coarse and fine NbX precipitates and also s-phase precipitates were formed in the temperature range 500-700°C. LÄS MER

7. 5. Stability of UO2 in systems containing radiolytic oxidants : The role of uranyl peroxide species

   Författare :Junyi Li; Mats Jonsson; Peter Burns; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; UO2; studtite; XPS; radiolysis; UO2; studtit; XPS; radiolys; Kemi; Chemistry;

   Sammanfattning : Nuclear power constitutes a major pillar on the global energy market, and it will most probably increase in importance as fossil fuels are gradually phased out. The main problem connected to nuclear power is the generation of highly radiotoxic spent nuclear fuel (95% UO2 and 5% radioactive fission products and heavier actinides). LÄS MER