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Grain Size Forecastion And Technology Optimization Of Complicated Workp Iece In Partial Forging Process

Posted on:2012-05-11Degree:MasterType:Thesis
Country:ChinaCandidate:C MaoFull Text:PDF
GTID:2211330362950851Subject:Materials science
Abstract/Summary:PDF Full Text Request
There are two steps on complicated 316L stainless steel workpiece which used in nuclear power station , but the two steps have some disadvantages that their grain size is big, processing is difficulty ,performance is relatively poor. This artical first establishs the mathematic model and physical model about the forging process of 316L stainless steel, and then simulates the forging process used of the DRFORM-3D sofrware. This artical dtailely analyses the relationship between technological patameters and temperature,effective stress, grain size according to the simulated results. This article also realizes minishing the grain size and improving the performance.The simulated results of temperature display that the temperature of the first step is higher than the second step. If the velocity of forging is a constant, when the initial forging raise, the final forging raise. If the initial temperature is a constant, when the velocity of forging increase, the final temperature of the two steps increase. The simulated results of effective stress display that the effective stress of the first step is lower than the second step. If the velocity of forging is a constant, when the initial temperature raises, the effective stress of the two steps reduces. If the initial temperature is a constant, when the velocity of forging increase, the effective stress reduces. When the initial forging temperature lower than 1000℃,the grain size of the two steps is very small, and difference of grain size is small in different forging techonology.When the forging velocity is 50mm/s, initial temperature is 1000℃, and the lubrication is good, the grain size of the two steps will remarkably reduced to 40~50μm, then the performance of the workpiece will remarkably increase.
Keywords/Search Tags:316L stainless steel, Forging technology, Numerical simulation, Grain size
PDF Full Text Request
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