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The Research Of Influence Law Of Near-isothermal Forging Processing Parameter On Grain Size And Mechanical Behavior Of GH4169 Alloy

Posted on:2008-11-12Degree:MasterType:Thesis
Country:ChinaCandidate:W SunFull Text:PDF
GTID:2121360212478574Subject:Materials Processing Engineering
Abstract/Summary:PDF Full Text Request
In this paper, the influence laws of near-isothermal forging processing parameter to the microstructure and performance of GH4169 superalloy are researched. The method of numerical simulation is also used to analyze the filling, the distribution of effective strain and other situations the forming process, and the load of the forging of turbine disk is predicted.The results of the experiment indicate that: At the same deformation and strain rate, the grain size grade declines as the increasing of the temperature, the tensile strength and plasticity of the samples are best which are forged in the temperature of 1020℃; At the same deformation temperature and strain rate, the plasticity of samples is better which are deformed by heavy deformation; At the same deformation temperature and deformation, the samples forged at lower strain rate can obtain relatively higher grain size grade, but higher strain rate can acquire a better performance.The results of the simulation indicate that: the filling ability of cylinder billet is better than ring billet, but the load is quite higher, the flow of the metal is difficult, and has distinct calorific effect; the filling ability of the ring billet is as well as the cylinder billet, it has lower forging load, fewer calorific effect and easier flowage, but the filling cavity will be deficient if it is shortage of volume; in order to make the metal flow easier and avoid the fold, the chamfer of billet must be smooth and greater, especially the cavity.
Keywords/Search Tags:GH4169 superalloy, turbine disk forging, near-isothermal forging, grain size grade, numerical simulation
PDF Full Text Request
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