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Wear Resistance Investigation Of TiC/TiC-TiB2 Particle Locally Reinforced Low Cr Steel Matrix Composites

Posted on:2010-06-06Degree:MasterType:Thesis
Country:ChinaCandidate:W D ChenFull Text:PDF
GTID:2121360272497106Subject:Materials Processing Engineering
Abstract/Summary:PDF Full Text Request
Wear is the indivisibility part of the tradition material science as the important offshoot of tribology,due to the complexity problem of the wear.No matter what of it from the material or tribology subject,It is yet immaturity field,because of the practice and theory significance.It have been well regard from the industry and academe field.Wear is one of the three mostly invaildation form of the material. It have cause terribly greatness of our economy loss.To research and exploit wear-resistant material of well performance and improve the using life of the wear-easy part have now became well concern question which needed to solve. Thanks to the high speed development of the modern industry and agriculture. It also take more request of the wear-resistant material.Wear-resistant material in common use generally demand that the material have high rigidity and high toughness, The part made of onefold material is difficult to satisfy with the inconsistency require.How to keep the high rigidity as well as high toughness is always the hotspot and difficulty in wear-resistant material research. Therefore.people make lots of research works.boffin exploit wear-resistant composites.But they are all emphasize particularly on whole composite. It improve the strength large-scale but at the same time reduce the tenacity and it is unable to reduce the facture cost;thus,To seek logical design structure of composites and exploit simple-applied facture technics is always the hotspot and keystone in wear-resistant material research field.The metal matrix composites (MMCs) have obtained the widespread concern of the materials researchers in the world owing to their unique properties, such as high specific strength, high specific modulus, excellent wear-resistant and high-temperature resistant, and become one of the most attractive materials in aerospace, automotive, mining, metallurgy and coal industry.The technology to research and exploit new pattern of metal matrix composites have become one of the most competitive hotspot in the industry field of the world.It shows that in experiment,banding together with the SHS and casting .to fabricate particulate in local reinforced steel matrix composites in the high temperature SHS reaction can integrate the high strength and high wear-resistant of the ceramic phase , high tenacity and high ductibility of the metal phase.it can provide the high quality synthesis performance of strength and tenacity which tradition material can not provide.It is preferable to solve the contradiction of rigidity and tenacity.thus,adopting local reinforced composites can meet different condition request,It have became together notion of material boffinThis research select Ni-Ti-C and Ni-Ti-B4C system to fabricate TiC and TiC-TiB2 particulate in situ reinforced low Cr steel matrix composites using SHS-casting route.Through the elementary investigate of composites wear performance in different condition and analysis on the worn and debris surfaces to elementary discuss wear-resistant mechanism of composites.If it can be used in practice produce, it is no doubt that it would be a magnitude progress in research domain and have a great of economy benefit and learning value.Look forward that this article research will pioneer a new thought for the design and produce of particulate in situ reinforced metal matrix wear-resistant composites,Providing theory foundation and practical technique for the industrialization and practicality of wear-resistant composites.The main research results are as follows:(1) Low Cr steel matrix composites consist of two area: particulate reinforced area and matrix area. In the particulate reinforced area.the sizes of TiB2 is a little large rather that TiC.Producetion of composites reinforced area is comparatively purity.With the content of particulate increasing, the sizes of TiC and TiB2 decrease gradually in composites reinforced area;It show that in the rigidity test in low Cr steel matrix composites reinforced area:with the change of Ni content,It have a great effect on the rigidity of particulate reinforced area in Ni-Ti-C and Ni-Ti-B4C system.thereinto,The rigidity of 10vol.%Ni content of Ni-Ti-B4C system particulate reinforced area is the biggest.Rigidity of particulate reinforced area is affect more greater by Double phases particulate of TiC-TiB2 than that of TiC.(2) The increase of particulate content can resist the abrasion on the matrix by abrasive grain and improved wear resistance of composites.With the granularity of abrasive grain and load increasing,the volume abrasion loss of composites increase and the wear resistance become bad.(3) Through the analysis of the,we can find that, in the condition of low load and small granularity of abrasive grain, debris surfaces of particulate reinforced area mostly present shape of piece and block,the size is small ,the manner of wear invalidation mostly is plough wear, the grooves of worn surfaces were shallow and narrow;in the condition of high load and large granularity of abrasive grain,the manner of wear invalidation mainly is the plough wear as well as cutting, the grooves of worn surfaces become more and more deep and wide;debris surfaces of low Cr steel matrix composites mostly present shape of strip or twist.the manner of wear invalidation mainly is the cutting wear, the grooves of worn surfaces become the most deepest and widest.
Keywords/Search Tags:TiC/TiB2, Metal matrix composites, Combustion synthesis, Wear, Mechanisms
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