The microstructure and mechanical properties of different grades of micro-porosity are studied by optical microscope, scanning electron microscopy, WDW-100KN universal tensile testing machine, and PLA30050 fatigue testing machine, together with the orthogonal test with three factors and levels. The results show that the most important impact parameter on the HIP process is temperature, followed by pressure and time. The tensile strength, yield strength, elongation, Brinell hardness, axial fatigue life and Q value of ZL114A alloy within the micro-porosity of grade III are increased to 340 MPa, 280 MPa, 8%, 125HBS, 4.1×105 and 475.45, respectively after the HIP process under 540℃, 140 MPa and 4 h conditions. Cconsidering both the process cost and effect, the optimal parameters of HIP process are 540℃, 140 MPa and 2 h. Compared with the micro-porosity of grade III, the Q values of grade I and grade II are increased by 5.1% and 2.4%, respectively after the HIP process, whereas the Q values of grades IV and V are decreased by 15.98% and 25.61%, respectively.
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