Search for dissertations about: "brittle to ductile transition"

Showing result 1 - 5 of 29 swedish dissertations containing the words brittle to ductile transition.

  2. 1. Microstructural aspects of the ductile-to-brittle transition in pressure vessel steels

    Author : Torbjörn Narström; KTH; []
    Keywords : dectile-to-brittele transition; cleavage fracture; ductile fracture; fracture mechanics; constraint; initiation; pressure vessel steel; cleavage fracture stress;

    Abstract : .... READ MORE

  4. 2. Experiments and modelling of fracture initiation at impact

    Author : Ola Wall; Hållfasthetslära; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vibration and acoustic engineering; vacuum technology; hydraulics; Viscoplasticity; Mechanical engineering; Ductile; Brittle; Dynamic; Fracture; Maskinteknik; hydraulik; vakuumteknik; vibrationer; akustik; Material technology; Materiallära; materialteknik;

    Abstract : The thesis addresses different questions, each necessary in the understanding of dynamic fracture initiation and crack propagation in steel. Emphasis lays on dynamic crack propagation experiments performed in the ductile to brittle transition region and possible conclusions, that can be drawn from them. READ MORE

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

    Author : Karin Hansson; KTH; []
    Keywords : 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;

    Abstract : 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. READ MORE

  6. 4. Ab initio Investigation of Al-doped CrMnFeCoNi High-Entropy Alloys

    Author : Xun Sun; Levente Vitos; Andreas Blomqvist; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; High-entropy alloys; Phase stability; Elastic anisotropy; Brittle ductile transition; Pugh criterion; First-principles calculation; Teknisk materialvetenskap; Materials Science and Engineering;

    Abstract : High-entropy alloys (HEAs) represent a special group of solid solutions containing five or more principal elements. The new design strategy has attracted extensive attention from the materials science community. The design and development of HEAs with desired properties have become an important subject in materials science and technology. READ MORE

  7. 5. Micromechanical modeling of cleavage fracture in polycrystalline materials

    Author : Mateusz Stec; Jonas Faleskog; Andre Pineau; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cleavage fracture; probabilistic modeling; brittle to ductile transition; cohesive zone; visco-plastic material; Engineering mechanics; Teknisk mekanik; Other technology; Övriga teknikvetenskaper;

    Abstract : Cleavage fracture in ferritic steels can be defined as a sequence of few critical steps. At first nucleation of a microcrack takes place, often in a hard inclusion. This microcrack then propagates into the surrounding matrix material. The last obstacle before failure is the encounter of grain boundaries. READ MORE