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Kinetics simulation and experimental observation of fine microstructure of 9%Ni cryogenic steel processed by QLT heat treatment |
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| Authors: | Tao Pan Jing Zhu Caifu Yang Hang Su |
| Institution: | 1. Division of Structural Steels, Central Iron and Steel Research Institute, Beijing, 100081, China 2. Beijing National Center for Electron Microscopy, Key Laboratory of Advanced Materials of Ministry of Education of China and State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China |
| Abstract: | Thermo-Calc and Dictra commercial calculation software programs have been used to simulate the formation of fine microstructure of 9%Ni cryogenic steel processed by quench–lamellarize–temper (QLT) heat treatment. The calculations show many compositional fluctuations in each single-martensite lath after QLT treatment; the peak concentrations of carbon and nickel reach about 0.40 % and 18 %, respectively. The width of the C or Ni element-enriched zone increases when the critical lamellarizing temperature decreases or the temper temperature increases. Extending the temper time has a similar effect on the element profiles. The simulation results are in accordance with the observed fine microstructures. |
| Keywords: | 9%Ni steel QLT Kinetics Reversedaustenite Composition fluctuation |
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