Effects of heat treatment temperature and duration on microstructure,mechanical properties and corrosion resistance of IN718 superalloy were investigated.The results indicate that grain size of the alloy is grade 7～8 with uni-form microstructure and absence of defects after heat treatment at 810 ℃ for 30 min,and desirable comprehensive mechanical properties can be obtained,where the hardness value reaches 250.48 HV,tensile strength is greatly increased by 8.48%,and the corrosion point area reaches the minimum of 1 132.66 μm2.The minimum weight of the alloy after corrosion is 0.001 0 g after heat treatment at 900 ℃ for 30 min,followed by that of ones at 810 ℃ for 30 min,which is about 0.001 3 g.
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