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Research Ion Nitriding And Ion Carbonizing On Ti6Al4V

Posted on:2009-01-16Degree:MasterType:Thesis
Country:ChinaCandidate:W T LiuFull Text:PDF
GTID:2121360272483291Subject:Materials Processing Engineering
Abstract/Summary:PDF Full Text Request
Titanium alloys suffer from the serious disadvantages of abrasion resistance difference and the lower high temperature oxidation resistance,in order to solve this problem this paper proposed to from surface-modified layers on Ti6A14V alloy by ion nitriding and ion carbonizing technique. The component,microhardness,tribological properties and high temperature oxidation resistance of surface-modified layers have been studied.The titanium alloy can obtain including high hard Ti2N,TiN modification layers through ion nitriding. Nitrided layer enhanced the surface strength of Ti6Al4V substrate, the hardness profile from top to inside shows a gradient characteristic. Modified layers increases along with the temperature enhancement, the time extension, and its thickness. Carries on the attrition experiment on the MM-200 frictional testing machines, the countpart is GCr15 steel loop. After the ion nitriding, the fretting-wear mechanism is adhesion and abrasion, all the modification layers can obtain the better abrasion resistance, and also greatly enhanced wear resistance.The titanium alloy can obtain including the TiC flinty modification layers through ion carbonizing. Modified layers enhanced the surface strength of Ti6AiV4 substrate, the hardness of modification layers is 2054HV, more than 5 times as that of Ti6A14V substrate. The hardness profile from top to inside shows a gradient characteristic. Modified layers increases along with the temperature enhancement, the time extension, and its thickness. Adopt the method that the intermittence is for infiltrate, avoids producing the carbon black layers. Through the heavy experimental and macroscopic superficial appearance analysis, Modified layers have good high-temperature stability, and the high temperature oxidation resistance of titanium alloy is considerably improved.
Keywords/Search Tags:titanium alloy, surface modification, ion nitriding, ion carbonizing, wear resistance, high temperature oxidation resistance
PDF Full Text Request
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