Sökning: "intragranular ferrite"

Hittade 5 avhandlingar innehållade orden intragranular ferrite.

1. 1. Formation of Bainite in Steels

   Författare :Jiaqing Yin; Annika Borgenstam; Bevis Hutchinson; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fe-C alloys; Bainitic transformation; Proeutectoid ferrite; Upper bainite; Lower bainite; Morphology; Steels.; Teknisk materialvetenskap; Materials Science and Engineering;

   Sammanfattning : A systematic survey of morphology of bainite and proeutectoid ferrite was carried out in order to validate some old thoughts of bainite transformation mechanism. It is confirmed that there is no morphological evidence supporting a sharp change neither between Widmanstätten ferrite and the ferritic component of upper bainite, nor between upper and lower bainite. LÄS MER

3. 2. Microstructure and Inclusion Characteristics in Steels with Ti-oxide and TiN Additions

   Författare :Wangzhong Mu; Pär Jönsson; Keiji Nakajima; Casper Van der Eijk; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; intragranular ferrite; oxide metallurgy; inclusion engineering; titanium nitride; titanium oxide; inclusion size; heterogeneous nucleation; critical diameter; confocal laser scanning microscopy CLSM ; differential scanning calorimetry DSC ; continuous cooling transformation CCT diagram.; Materials Science and Engineering; Teknisk materialvetenskap;

   Sammanfattning : Non-metallic inclusions in steels are generally considered to be detrimental for mechanical properties. However, it has been recognized that certain inclusions, such as Ti-oxide and TiN, can serve as potent nucleation sites for the formation of intragranular ferrite (IGF) in low-alloy steels. LÄS MER

4. 3. Precipitation in Advanced Stainless Steels

   Författare :Niklas Holländer Pettersson; Annika Borgenstam; Sten Wessman; Joacim Hagström; Jacques Charles; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk materialvetenskap; Materials Science and Engineering;

   Sammanfattning : Advanced stainless steels often suffer from complex precipitation behaviour due to the high levels of alloying elements needed to obtain their attractive properties. This demands a correct handling of the material to avoid formation of harmful phases during production, manufacturing and service. LÄS MER

5. 4. Influence of carbides and nitrides on corrosion initiation of advanced alloys : A local probing study

   Författare :Eleonora Bettini; Jinshan Pan; Thomas Ladwein; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; carbides; nitrides; microstructure; CoCrMo alloys; duplex stainless steels; localized corrosion; transpassive dissoluti on; elemental depletion; AFM; TEM; SEM.;

   Sammanfattning : Advanced alloys often present precipitated carbides and nitrides in their microstructure following exposure to elevated temperatures. These secondary phases are usually undesirable, because potentially deleterious for the corrosion and mechanical performances of the material. LÄS MER

7. 5. Fracture behaviour and related microstructures of tool steels parted-off at high rates of strain

   Författare :Kristina Ryttberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; high-velocity parting-off; adiabatic cutting; high strain-rate deformation; TEM; steel; adiabatic shear band;

   Sammanfattning : Increasing steel prices and environmental aspects have put forward the demand to reduce material consumption in manufacturing industry and near-net-shape manufacturing techniques have thus become increasingly important. High-velocity parting-off, or adiabatic cutting, has shown to result in very low material waste as well as narrow dimensional tolerances of parted-off samples. LÄS MER