ISSN:
1013-9826
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:
The microstructure and wear-resistance of the welding deposited metal of Fe-Ti-Nb-V-Cand Fe-Cr-W-Mo-C alloy system (with American MG700 as example) are studyed by using SEM ,TEM and MM200 wear testing machine. It is revealed that Ti and Nb promote the formation ofdispersed MC type carbide granules, while the carbides of Cr and W or Mo tend to precipitate alonggrain boundary. The formation of MC carbide granules depletes the carbon content in the matrix,and then low carbon martensite matrix can be achieved. The hard and tough matrix and the granularcarbides improve the wear-resistance of the deposited metal. But excessive Ti and Nb induce theformation of bigger granules with sharp corner and result too soft matrix, then the wear-resistancedecrease. As to the Fe-Cr-W-Mo-C alloy system, network carbides and high carbon martensitematrix make the deposited metal very brittle. During wearing process, the propagating ofmicrocrack in the matrix induces lots of scraps flake off, which decrease the wear-resistance of thedeposited metal. The deposited metal of Fe-0.64Ti-1.18Nb-2.18V-1.43Cr-0.97C alloy system incurrent study achieve the best wear-resistance
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.766.pdf
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