Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 805, Issue -, Pages 1025-1033Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.07.181
Keywords
FeCrAl alloys; ZrC; Mechanical property; Dispersion strengthening
Categories
Funding
- National Key Research and Development Program of China [2017YFA0402800, 2017YFE0302400]
- National Natural Science Foundation of China [51671184, 51801194, 51601189, 51771181, 11775255]
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ZrC dispersion-strengthened FeCrAl alloys with enhanced high-temperature strength and good ductility were fabricated through spark plasma sintering (SPS) and hot-forging. Nanosized ZrC particles with an average particle size of 56 nm were homogeneously dispersed in the FeCrAl-ZrC alloys. The addition of a small proportion of ZrC nanoparticles effectively refines the grain size and improves the strength and hardness of FeCrAl alloys. However, the ductility of FeCrAl alloys decreases gradually when the ZrC content increases from 0 wt% to 2.0 wt%. The tensile strength of SPSed FeCrAl-1.0 wt% ZrC alloy at 800 degrees C is 91 MPa, which is about 69% higher than that of pure FeCrAl, while the percentage elongation after fracture of FeCrAl-1.0 wt% ZrC is 15.0%, which is lower than that of FeCrAl (48.2%). To improve the ductility of FeCrAl-ZrC alloys, the SPSed samples were subjected to hot forging at 1000 degrees C. Through hot-forging, significant enhancement in ductility of FeCrAl-ZrC alloys was achieved without reducing the strength. The mechanical properties and microstructure of FeCrAl-1.0 wt% ZrC are stable after annealing at 1000 degrees C for 5 h, exhibiting superior thermal stability as compared with FeCrAl. (C) 2019 Elsevier B.V. All rights reserved.
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