Search for dissertations about: "powder metallurgy steels"

Showing result 1 - 5 of 23 swedish dissertations containing the words powder metallurgy steels.

  1. 1. Novel approaches for achieving full density powder metallurgy steels

    Author : Maheswaran Vattur Sundaram; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cr- and Mo-alloyed PM steels; vacuum sintering; high density; full density; hot isostatic pressing.; cold isostatic pressing; liquid phase sintering; master alloy; double pressing-double sintering; powder metallurgy steels; sintering; water atomised powder;

    Abstract : Powder metallurgy (PM) is one of the most resource-efficient methods for manufacturing structural components with complex shapes. The utilisation of the metal powder to shape the components allows to minimise material waste and increase energy efficiency. READ MORE

  2. 2. Alloy element redistribution during sintering of powder metallurgy steels

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Abdul Malik Tahir; Gustav Amberg; Jose Manuel Torralba; [2014]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cu redistribution kinetics; diffusion; phase field modeling; powder metallurgy; swelling; liquid phase sintering; Materials Science and Engineering; Teknisk materialvetenskap; Teknisk mekanik; Engineering Mechanics;

    Abstract : Homogenization of alloying elements is desired during sintering of powder metallurgy components. The redistribution processes such as penetration of liquid phase into the interparticle/grain boundaries of solid particles and subsequent solid-state  diffusion of alloy element(s) in the base powder, are important for the effective homogenization of alloy element(s) during liquid phase sintering of the mixed powders. READ MORE

  3. 3. Delubrication of Chromium Prealloyed Powder Metallurgy Steels

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Seshendra Karamchedu; [2013]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; alloyed sintered steels; delubrication; surface oxide; sintering atmosphere; processing atmosphere control; lubricant;

    Abstract : Consolidation of steel components produced by means of powder metallurgy (PM) is achieved typically through compaction and sintering. During consolidation, final dimensions of the part are already achieved after compaction, while sintering imparts strength to the components. READ MORE

  4. 4. Critical Aspects of Delubrication and Sintering of Chromium-alloyed Powder Metallurgy Steels

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Seshendra Karamchedu; [2015]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; delubrication; oxide reduction; surface oxide; carbon control; sintering atmosphere; chromium-alloyed sintered steels;

    Abstract : The cost efficiency and performance of Powder Metallurgy (PM) steels can be improved by replacing conventionally used alloying elements such as copper and nickel with chromium. Utilizing chromium imposes a challenge in terms of processing due to its effect on powder compressibility and high oxygen affinity, the latter of which, to a certain extent, is dealt with by introducing chromium in prealloyed form that decreases its activity. READ MORE

  5. 5. Processing Methods for Reaching Full Density Powder Metallurgical Materials

    University dissertation from Gothenburg : Chalmers tekniska högskola

    Author : Maheswaran Vattur Sundaram; [2017]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; gas atomised powder; water atomised powder; high density powder metallurgical materials; high density; master alloys; liquid phase sintering; sintering; high velocity compaction; hot isostatic pressing; additive manufacturing;

    Abstract : Powder metallurgy (PM) is one of the most cost effective methods for manufacturing structural components with complex shapes. Utilisation of the metal powder to shape the components allows to minimise material waste and increase energy efficiency. READ MORE