ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Grain refinement is well known to influence the mechanical properties of materials,especially the strength characteristics. The promising method for grain refinement is a SPD processand it produces the homogenized nano grain material which exhibits very high strength and limitedductility. Recently the grain refinement technique by the SPD in powder metallurgy (PM) field hasreceived much attention. The SPD-PM process is one of new processes combining mechanicalmilling (MM) or alloying (MA), heat treatment and sintering processes. Microstructure of theSPD-PM materials is easily controlled by the MM condition, and hence we can intentionally make aheterogeneous microstructure. In the present study, commercially pure titanium, Ti-6Al-4V alloyand SUS316L stainless steel powders are applied to the SPD-PM process. These MM powders aresintered by Hot Roll Sintering (HRS) process. These SPD-PM materials demonstrate aheterogeneous microstructure and high strength and advanced plastic strain. The microstructure ofmaterials consists of a shell and core hybrid microstructure, that is, a shell structure with nanograins and a core structure with work-hardened coarse grains. All of the materials fabricated bythese processes demonstrate not only superior strength but also enough elongation. The mechanicalproperties are strongly influenced by the shell / core microstructure. The nano / meso hybridmicrostructure by these processes has been proved to be very effective to improve mechanicalproperties
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.55.pdf
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