Sökning: "Tempering"

Visar resultat 21 - 25 av 37 avhandlingar innehållade ordet Tempering.

1. 21. Precipitate stability in creep resistant 9-12% chromium steels

   Författare :Ardeshir Golpayegani; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; growth; precipitates; coarsening; atom probe field ion microscopy APFIM ; energy filtered TEM EFTEM ; 9-12% chromium steel;

   Sammanfattning : 9-12% chromium steels are used extensively in modern steam power plants at service temperatures up to 600°C. These materials are subjected to creep deformation during exposure which is the limiting factor in increasing the steam temperature and thus the thermal efficiency of the plants. LÄS MER

3. 22. Precipitation Reactions at High Temperatures in 9-12% Chromium Steels

   Författare :Mats Hättestrand; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; thermo-dynamical simulations; creep resistant; 9-12% chromium steel; energy filtered TEM; precipitates; atom probe field ion microscopy; quantitative metallography;

   Sammanfattning : This thesis reports on quantitative investigations of microstructural changes, mainly precipitation reactions, occurring during heat treatment, ageing and creep of 9-12% chromium steels. Several alloys with varying composition have been investigated. LÄS MER

4. 23. Microstructure and Properties of Additively Manufactured Tool Steels for Hot Stamping

   Författare :Miwen Yuan; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Tool Steels; Wear; Hot stamping; Additive Manufacturing; Softening Resistance;

   Sammanfattning : Hot work tool steels are commonly used to produce dies for hot stamping, where the steels are exposed to cyclic thermal and mechanical loads. There is a constant demand to improve the lifetime of the dies. Additive manufacturing (AM) provides new solutions for tool design. LÄS MER

5. 24. Mechanical Properties, Microstructures and Defects of Tool Steels Fabricated by Additive Manufacturing

   Författare :Yuan Miwen; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Additive manufacturing; Carbides; Post heat treatment; Directed energy deposition; Softening resistance; Pores; Laser beam powder bed fusion; Solidification cracking; Tool steels;

   Sammanfattning : Additive Manufacturing (AM) has been gaining significant interest in the manufacturing of metallic materials in the recent years. From a techno-commercial standpoint, tooling is one of the areas with low production volumes but very high demands on part performance and complexity in design, all of which are characteristic for metal AM. LÄS MER

7. 25. Shaping an identity : Pitted Ware pottery and potters in southeast Sweden

   Författare :Ludvig Papmehl-Dufay; Kerstin Lidén; Mats Larsson; Ole Stilborg; Andrew Jones; Stockholms universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; Pitted Ware culture; pottery; middle Neolithic; Öland; Köpingsvik; Ottenby Royal Manor; cultural identity; pottery design; pottery technology; pottery use; Archaeology; Arkeologi; Archaeology; North European; Archaeology;

   Sammanfattning : The thesis is concerned with pottery and culture during the Middle Neolithic (c. 3300 – 2300 cal BC) in southeast Sweden. Its purpose is to investigate and discuss the significance of pottery in the Pitted Ware culture, particularly on the island of Öland in the Baltic Sea. LÄS MER