Dissertation > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Steel > Microstructure and properties of steel > Analysis of the steel test

Study on Precipitation Behaviors of Carbonitride of Vanadium in HRB400 Reinforced Steel Bars

Author JiangLiPing
Tutor ShengGuangMin
School Chongqing University
Course Materials Science and Engineering
Keywords Micro-alloyed steel Precipitation kinetics Stress relaxation Reinforced
CLC TG142.15
Type Master's thesis
Year 2007
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Fully beneficial role to play the HRB400 20MnSiV reinforcement trace V stress relaxation study of vanadium carbonitride precipitation in austenite behavior in the test material , draw the corresponding percentage of sediment - temperature - time curve ( PTT curve ), using a transmission electron microscope (TEM) for the precipitation of vanadium in the specimen after stress relaxation was observed , analysis, and use of the proposed process parameters , in the production site Shuigang rolling test , observation the results showed that , V the precipitation behavior improved . The experimental results show that , in the same compression deformation amount and vanadium carbonitride precipitates kinetic curve was typical of the \When the amount of compressive deformation ε = 0.05 ( true strain e = -0.05) , the fastest precipitation temperature of approximately 850 ° C , begins to precipitate approximately 6s ; compression deformation ε = 0.20 ( e = -0.22 ) , the fastest precipitation a temperature of about 870 ° C , the deposition time of approximately 0.7s ; when the compression deformation amount of ε = 0.50 ( E = -0.69 ) , the fastest precipitation temperature of about 870 ° C , began to precipitate time about 1.2s . At the same temperature , when the compression deformation amount increases , will accelerate vanadium carbonitride precipitates . With a transmission electron microscope, the film sample is observed when the amount of deformation of the precipitation temperature of the fastest found vanadium carbonitride not only precipitation in the interior of the grains , and more is the bit near the disclination line precipitated . The experimental results obtained by thermodynamics, kinetics calculation validation , both consistent .

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