首页|Research on high-temperature mechanical properties and microstructure of powder metallurgical rhenium
Research on high-temperature mechanical properties and microstructure of powder metallurgical rhenium
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NSTL
Elsevier
Metallographic microscope, scanning electron microscope (SEM), electron backscatter diffraction (EBSD), X-ray diffraction analysis (XRD) and mechanical properties testing methods are used to investigate the mechanical properties and microstructure of the annealed powder metallurgical (PM) rhenium (Re) at five different tem-peratures (room temperature, 800 degrees C, 900 degrees C, 1000 degrees C, 1100 degrees C). The elongation and reduction of cross section of the annealed PM Re are found to decrease with increasing temperature. Specifically, the elongation and reduction of cross section are 12.5% and 14.28% at room temperature, and drop to 0.25% and 3.975% at 1100 degrees C. The ultimate tensile strength of the annealed PM Re is also found to decrease with the increasing temperature, while the yield strength is found to first increases and then decreases with the increasing tem-perature. The ultimate tensile strength and yield strength are 884 MPa and 220 MPa at room temperature, 643 MPa and 550 MPa at 800 degrees C, 485 MPa and 467 MPa at 1100 degrees C, respectively. Observed by SEM and metallo-graphic microscope, the fracture mode is identified to be transgranular quasi-cleavage at room temperature and 800 degrees C, and a mixed fracture of inter-particle debonding and transgranular quasi-cleavage at 900 degrees C-1100 degrees C.
NSTL
Elsevier
