Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 768, Issue -, Pages 136-142Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.07.154
Keywords
Co-Ni-based superalloy; Suzuki segregation; Microstructure; Mechanical property
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Funding
- project of The Science Fund for Distinguished Young Scholars of Hunan Province, China [2016JJ1016]
- project of Innovation and Entrepreneur Team Introduced by Guangdong Province [201301G0105337290]
- Special Funds for Future Industrial Development of Shenzhen [HKHTZD20140702020004]
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Mo, as one of the most important elements in superalloy, dramatically affected the microstructure and mechanical properties via solution strengthening, forming Mo-enriched phase, and atomic segregation (Suzuki effect). To verify the influence of Mo on the microstructure and mechanical properties of Ni-Co-based superalloy, two types of alloys containing 4 wt% (A4) and 8 wt% (A8) Mo were prepared. The microstructure was examined using X-ray diffraction, scanning electron microscope, and transmission electron microscope, while the mechanical properties were evaluated using tensile tests at both room temperature and elevated temperature (700 degrees C). The segregation of Mo at stacking faults was observed in both alloys after aging with pre-cold-rolling. At the same time, in alloy A8, direct precipitation of mu phase both along grain boundary and in the interior of matrix was observed after aging. In alloy A4, segregation of Mo along stacking fault ribbons resulted in formation of quasi-mu phase. The quasi-mu phase developed into mu phase during prolonged aging. There was no precipitate along grain boundary in A4 after aging resulting in poor ductility at both room and elevated temperature. The strength was enhanced by net effect of Suzuki segregation, gamma' phase strengthening, and fine mu phase. (C) 2018 Elsevier B.V. All rights reserved.
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