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Title of Journal: Sci China Technol Sci

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Abbravation: Science China Technological Sciences

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SP Science China Press

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DOI

10.1007/bf02705671

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1862-281X

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Distortion behavior of hydro turbine blade casting

Authors: HaiLiang Yu JinWu Kang TianYou Huang
Publish Date: 2010/12/30
Volume: 54, Issue: 1, Pages: 81-87
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Abstract

Distortion often appears at the corners of heavy turbine blade castings during heat treatment processes so a great machining allowance is generally set in production which directly results in cost increase In this paper a novel realtime measuring technology is developed for noncontact measuring the deformation behavior of heavy steel castings in heat treatment process It was employed to measure the distortion and the temperature field of a batch of heavy turbine blade castings at cooling stage in normalizing process Three inflection points appear in the distortiontime curves and the residual distortion is affected by the regional area of not finished martensite transformation when the second inflection point appears When the mean air temperature falls into the range of 10°C–20°C the residual distortion is small when it is lower than 10°C positive distortion appears when it is higher than 20°C negative distortion appears The distortion varies with seasonal temperature which is directly responsible for the great machining allowance given in production

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