Sökning: "influence of the mechanism of metal"

Visar resultat 1 - 5 av 78 avhandlingar innehållade orden influence of the mechanism of metal.

1. 1. Mechanisms of Metal Dusting

   Författare :Peter Szakálos; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; metal dusting; mechanism; driving force; kinetics; high temperature corrosion; carburization; stainlesssteel; Ni-base alloys; iron; alumina formers; FeCrAl; oxidation; carbon nanotubes; discontinuous precipitation; Materials science; Teknisk materialvetenskap;

   Sammanfattning : The primary intention with this Doctoral thesis is to fillin the knowledge gaps and raise the level of understandingregarding the different metal dusting mechanisms in general andexplain the process in detail for high alloyed materials.Considerable effort is put into identifying the driving forcesand elucidating the diffusional processes in metal dusting. LÄS MER

3. 2. The Positive Effect of Nitrogen Alloying of Tool Steels Used in Sheet Metal Forming

   Författare :Irma Heikkilä; Staffan Jacobson; Sture Hogmark; Pavel Krakhmalev; Uppsala universitet; []
   Nyckelord :galling; nitrogen; tool steel; sliding contact; metal forming; Teknisk fysik med inriktning mot tribomaterial; Engineering Science with specialization in Tribo Materials;

   Sammanfattning : Sheet metal forming processes are mechanical processes, designed to make products from metal sheet without material removal. These processes are applied extensively by the manufacturing industry to produce commodities such as heat exchangers or panels for automotive applications. They are suitable for production in large volumes. LÄS MER

4. 3. The reactive formation of TiSi2in the presence of refractory metals

   Författare :Aliette Mouroux; KTH; []
   Nyckelord :;

   Sammanfattning : Titanium disilicide (TiSi2) has been the favoured material for contactmetallisation in recent Si devices. The formation of TiSi2usually begins with the high resistivity C49 phaseas a result of the Ti-Si interaction at about 300-550 °Cand finishes with the low resistivity C54 phase through theC49-C54 phase transformation at about 700 °C. LÄS MER

5. 4. A Study on Desulfurization of Hot Metal Using Different Agents

   Författare :David Lindström; Du Sichen; Nortier Patrice; Shin-ya Kitamura; KTH; []
   Nyckelord :desulfurization; hot metal; CaO; Mg; CaC2; ZnO; reaction mechanism; desulfurization abilities; Teknisk materialvetenskap; Materials Science and Engineering;

   Sammanfattning : This thesis deals with desulfurization of hot metal using different agents. The aim of this study was to improve the understanding of commonly used desulfurization agents such as fluidized CaO, CaC2, commercial-CaO, Mg, and mixtures of commercial-CaO-Mg. The possibility to use ZnO for desulfurization of hot metal was also investigated. LÄS MER

7. 5. Workpiece steels protecting cutting tools from wear : A study of the effects of alloying elements on material transfer and coating damage mechanisms

   Författare :Toshiharu Aiso; Staffan Jacobson; Urban Wiklund; Staffan Söderberg; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Metal cutting; Steel; Cutting tools; Transfer; Coating; Sliding; Teknisk fysik med inriktning mot tribomaterial; Engineering Science with specialization in Tribo Materials;

   Sammanfattning : The vision of this thesis is to improve the machinability of workpiece steels. Workpiece material frequently transfers to the cutting tools during machining, and the transfer layers then forming on the tools may give both good and bad effects on machining performance and tool life. LÄS MER