期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 735, 期 -, 页码 1520-1535出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.11.299
关键词
Nickel-base superalloy; Dynamic recrystallization; Grain growth; Finite element simulation
资金
- National Key Research and Development Program of China [2017YFB0305201]
- Fundamental Research Funds for the Central Universities [FRF-TP-17-002A1]
The recrystallization behavior of alloy 617B is investigated by isothermal hot compression tests in a temperature range of 1120-1210 degrees C with a strain rate scope of 0.01-20 s(-1). The effect of deformation parameters on DRX behavior is studied by optical microscopy and electron backscatter diffraction (EBSD) technique. The major dynamic recrystallization (DRX) mechanism of alloy 617B is confirmed to be discontinuous dynamic recrystallization (DDRX), accompanied by some characteristics of continuous dynamic recrystallization (CDRX). The DRX process is apparently influenced by strain rate and is accelerated in high strain rate condition, which is different from traditional awareness that high strain rate can inhibit DRX. As a result, a segmented model of strain rate is proposed to describe the DRX kinetics of alloy 617B. Furthermore, a grain growth model is also developed for the simulation of actual manufacture process. DEFORM-2D software is adopted for hot extrusion simulation and FORTRAN language is used for secondary development to invoke the developed model effectively. The simulated microstructure agrees well with the actual manufactured pipe of alloy 617B, demonstrating that the models and simulation method proposed in present study can be used for microstructure prediction and optimization for alloy 617B during hot deformation. (C) 2017 Elsevier B.V. All rights reserved.
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