Abstract
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Temperature field has been widely used to predict the deformation of the blade castings
during a heat treatment process. However, it is difficult to predict distortion of the
castings. In this article, a new parameter, surface temperature difference of the castings
along the thickness direction, has been proposed to analyze distortion of the thin-walled
heavy castings with weak rigidity. The parameter was applied to the analysis of
distortion of a heavy blade casting under various air speeds of the fans during heat
treatment. The calculated minimum temperature in the blade casting was in good
agreement with the actual measured value. The surface temperature differences result
in the distortion process of the blade during the heat treatment process.