Essays about: "precipitation on grain boundaries"

Showing result 1 - 5 of 9 essays containing the words precipitation on grain boundaries.

  1. 1. Precipitation behavior of the super austenitic stainless steel SANICRO® 35 and the effect on impact toughness and pitting corrosion resistance

    University essay from KTH/Materialvetenskap

    Author : Shunyi Li; [2022]
    Keywords : Super austenitic stainless steel; solid phase transformation; TTT diagram; impact toughness; critical pitting temperature; TC PRISMA simulation; Superaustenitiskt rostfritt stål; fastfasomvandling; TTT-diagram; slaghållfasthet; kritisk punktfrätningstemperatur; TC PRISMA simulering;

    Abstract : This research extended the knowledge of the solid phase transformation and the resulting influence on impact toughness and pitting corrosion resistance in super austenitic stainless steel (SASS) SANICRO® 35. A time-temperature-transformation diagram (TTT diagram) was assembled by performing isothermal heat treatments in the temperature range of 650-1050 °C for different periods of time, ranging from 5 min to 500 min. READ MORE

  3. 2. Aluminium Nitride-containing Steels for High-Temperature Low-Pressure Carburizing Processes

    University essay from KTH/Materialvetenskap

    Author : Elias Nybacka Reiland; [2022]
    Keywords : ;

    Abstract : By increasing the temperature at which low-pressure carburizing is performed, the process time for production of case-hardened steels decrease but run a risk of abnormal grain growth occurring during carburizing. Particles present in the steel pin the grain boundaries and can prevent this growth depending on their size and volume fraction. READ MORE

  4. 3. Thermal Stability of Titanium and Niobium Stabilized Stainless Steel

    University essay from Lunds universitet/Synkrotronljusfysik; Lunds universitet/Fysiska institutionen

    Author : Oskar Darselius Berg; [2020]
    Keywords : Technology and Engineering;

    Abstract : This master thesis examined the microstructure after heat treatments in stainless steel, two conventional stainless steel (304 and 316) and two novel high temperature stainless steel. These stainless steels are for the use in high temperature heat exchangers for extended temperature range. READ MORE

  5. 4. Degradation mechanisms of UN and UN–10U3Si2 pellets of varying microstructure by comparative steam oxidation experiments

    University essay from KTH/Reaktorfysik

    Author : Selim Uygur; [2016]
    Keywords : Uranium Mononitride; Uranium Silicide; Composite; Steam degradation; corrosion mechanism;

    Abstract : During an extended LOCA in a LWR, the current UO2 fuel reaches very high temperatures and eventually melts, while the current Zircaloy fuel cladding oxidizes releasing hydrogen. These two consequences can lead to an unacceptable amount of radioactive release by presenting accident routes for containment failure. READ MORE

  6. 5. Construction of cooling rig and investigation of cooling sensitivity for aluminum crash alloy

    University essay from KTH/Materialvetenskap

    Author : Lars Björk; [2015]
    Keywords : quenching; cooling sensitivity; crash performance; aluminum alloy; cooling rates; quenching rates; precipitation on grain boundaries; Mg2Si; cooling rig; cooling equipment; bending angle;

    Abstract : The work presented in this master thesis deal with the issue of quenching, investigation regarding different cooling rates and its effect on the material properties of aluminum alloy in the 6xxx series used for crash purposes in cars, such as crash boxes, beams and other crash relevant parts. Precipitation of Mg2Si due to different cooling rates affects the material properties such as crash performance, thus the aluminum alloy used is sensitive to different cooling rates. READ MORE