This paper carries out research on grain growth behaviour of the IN718Plus alloy while holding at 960～1140℃ for 0.5～3 h to analyze the influence of heating temperature on grain size,and to derive and fit the grain growth kinetic model of IN718Plus alloy. The results show that when the heating temperature is lower than 1060℃,grain growth rate is slow and the grain size changes slightly;when the heating temperature is higher than 1060 ℃,the grain size grows significantly. A two-stage grain growth kinetic model of IN718Plus alloy is obtained by linear fitting,and proves that the calculation results and experimental results are in high consistence.
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