Mathematical Simulation Of Billet Profile Growing Process And Structure Prediction During Spray Forming Process

The technology of spray forming that was developed in the casting and the art of powder metallurgy have not only the virtue of rapid solidification, but also conquer the defaults of high cost as well as complicated working procedure. It is hopeful to play an important part in the metallurgical industry as well as other industrial application.According to prepared GCr15 bear steel deposition billets, the thesis's major research working is simulating and analyzing every stage of spray forming. What is more, GCr15 steel's structure is predicted and analyzed in the process of spray forming.Adopted the method of coordinate tracking, the deposition billet shape model of eccentric and incline is built. The deposition billet's shape and size are predicted in different spray forming condition Through analyzing the rule about the spray forming influencing on deposition billet's shape, the conclusions are as follow: when the depositor is level installed and vertical spray , cylindrical deposition billet can't be formed:When the metal fogdrop is oblique spray and the depositor is vertical moved, the benign deposition billet can be formed.The thesis calculates the deposited billet's two dimensional transient temperature field using the method of well-rounded finite element numerical analysis. Adopted the method of life and death elements, the method can be used to simulate the process of deposition billet continuous growth process.The result show that the depositing's rate of cooling can achieve 102 Ks-1 order of magnitude in the depositing initial stage ,then the depositing's rate of cooling decrease to 101 to 100 Ks-1 order of magnitude.GCr15 steel's different structure can be received according to the curve of the steel's CCT. The remnants austenite and martensite that their hardness is high can be received because of big rate of cooling in boundary region. In the depositing's inner compartment, the mixed organize about remnants austenite,bainate and martensite that their hardness are small can be received in room temperature.