ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The critical times of phosphorus segregation in low alloy steel 12Cr1MoV at different solutiontemperatures, 1050°C and 1300°C, are studied and the diffusion coefficient of complexes, Dc, anddiffusion coefficient of phosphorus, Di, are calculated. Results show that the calculated result with thekinetic equations perfectly fits with the experimental observations. And that the higher the solutiontemperature, the higher is the segregation level of phosphorus, and also the longer is the critical time. Italso shows that in the segregation process, the rate of phosphorus segregation at first is high due to a largediffusivity of the complex, Dc. Then the segregation rate decreases due to decreasing complexconcentration gradient. In the de-segregation process, the level of phosphorus segregation decreases withincreasing holding time t. But the rate of phosphorus desegregation from grain boundaries to centre isslower compared with that in segregation for the diffusion coefficient of phosphorus atoms, Di, is farlower than that of the complexes, Dc
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2369.pdf
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