Sökning: "Solidification cracking"

Visar resultat 1 - 5 av 11 avhandlingar innehållade orden Solidification cracking.

  1. 1. On the hot crack formation during solidification of iron-base alloys

    Detta är en avhandling från Stockholm : Industriell produktion

    Författare :Karin Hansson; KTH.; [2001]
    Nyckelord :hot cracking; hot tearing; cracking fracturing ; tearing; ductility; brittleness; embrittlement; fractures; ductile brittle transition; solidification; iron; copper; nickel; Invar; steels; free machining steels; stainless steels; penetration; crack;

    Sammanfattning : Hot cracking during solidification is a severe problem inmany casting processes, for example in continuous casting.Combinations of low strength and low ductility of the materialat high temperatures and applied tensile stress can cause hotcracking. LÄS MER

  2. 2. Weldability of Precipitation Hardening Superalloys – Influence of Microstructure

    Detta är en avhandling från Stockholm : Industriell produktion

    Författare :Joel Håkan Andersson; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hot cracking; GTAW; Transvarestraint testing; Varestraint testing; Gleeble testing; Solidification cracking; HAZ liquation cracking; Repair welding; Strain age cracking; EBW; DSC thermal analysis;

    Sammanfattning : Superalloys and in particular the precipitation hardened Ni-based superalloys havealways been used extensively in the hot sections of jet engines. Large hot structuralengine components with complex geometry have preferably been cast as single piececomponents since the large scale vacuum investment casting process becameavailable about fifty years ago. LÄS MER

  3. 3. Weld Cracking in Precipitation Hardening Ni-based Superalloys

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :Fabian Hanning; [2018]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; welding; post weld heat treatment; weldability; Nickel based superalloys; strain age cracking; weld cracking;

    Sammanfattning : Manufacturing of hot structural components for aero engines requires the materials being used to be weldable. The high demands on strength and temperature resistance make nickel based superalloys the material of choice for this application. LÄS MER

  4. 4. Modeling and Simulation of Weld Hot Cracking

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Joar Draxler; Luleå tekniska universitet.; [2019]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material Mechanics; Materialmekanik;

    Sammanfattning : Several alloy systems are susceptible to weld hot cracking. Weld hot cracking occurs by fracture of liquid films, normally grain boundary liquid films, at the late stage of the solidification of the weld. The cracks can be small and therefore difficult to detect by nondestructive test methods. LÄS MER

  5. 5. On the Experimental Determination of Damping of Metals and Calculation of Thermal Stresses in Solidifying Shells

    Detta är en avhandling från Stockholm : KTH

    Författare :Jonas Åberg; KTH.; [2006]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; material damping; measurement methods; calorimetric methods; optical strain gauge measurements; hot cracking; stress in solid shells; ALE; TECHNOLOGY Materials science; TEKNIKVETENSKAP Teknisk materialvetenskap;

    Sammanfattning : This thesis explores experimentally and theoretically two different aspects of the properties and behaviour of metals: their ability to damp noise and their susceptibility to crack when solidifying.The first part concerns intrinsic material damping, and is motivated by increased demands from society for reductions in noise emissions. LÄS MER