Search for dissertations about: "Pore Defects"

Showing result 1 - 5 of 25 swedish dissertations containing the words Pore Defects.

  2. 1. Detection and 3-D positioning of small defects using digital radiography, 3-D point reconstruction, and tracking

    Author : Erik Lindgren; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Pore Defects; Radiographic Testing; Nondestructive Evaluation; Laser Welded Titanium; Multiple Hypothesis Tracking; X-ray Testing;

    Abstract : The weight and quality concerned aero industry is constantly trying to decrease the excess material in their components. With decreased weight the fuel consumption can be lowered and the negative environmental effects from aviation decreased. READ MORE

  4. 2. Structural study of nano-structured materials: electron crystallography approaches

    Author : Yanhang Ma; Peter Oleynikov; Osamu Terasaki; Reine Wallenberg; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; structural analysis; electron crystallography; 3D EDT; HRTEM imaging; defects; Inorganic Chemistry; oorganisk kemi;

    Abstract : The structural analysis serves as a bridge to link the structure of materials to their properties. Revealing the structure details allows a better understanding on the growth mechanisms and properties of materials, and a further designed synthesis of functional materials. READ MORE

  5. 3. Laser welding and cladding : the effects of defects on fatigue behaviour

    Author : Md. Minhaj Alam; Stewart Williams; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Manufacturing Systems Engineering; Produktionsutveckling;

    Abstract : The thesis focuses on weld defects in laser processed materials (for laser welding, laser hybrid arc welding and laser cladding) and their effect on the fatigue life of components. Component properties were studied with particular emphasis on the macro and micro surface geometry, weld defects and clad defects. READ MORE

  6. 4. Modelling of Radiographic Testing to Derive a Detection Positioning and Sizing Algorithm for Pore Defects

    Author : Erik Lindgren; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : When laser welding light weight materials, e.g. aluminium and titanium based alloys, small sub-millimeter pore defects occasionally forms. Due to their small sizes, less than some 0. READ MORE

  7. 5. Mechanical Properties, Microstructures and Defects of Tool Steels Fabricated by Additive Manufacturing

    Author : Yuan Miwen; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Additive manufacturing; Carbides; Post heat treatment; Directed energy deposition; Softening resistance; Pores; Laser beam powder bed fusion; Solidification cracking; Tool steels;

    Abstract : Additive Manufacturing (AM) has been gaining significant interest in the manufacturing of metallic materials in the recent years. From a techno-commercial standpoint, tooling is one of the areas with low production volumes but very high demands on part performance and complexity in design, all of which are characteristic for metal AM. READ MORE