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Distortion Behavior of a Heavy Hydro Turbine Blade Casting During Forced Air Cooling in Normalizing Treatment Process

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Abstract

Distortion behavior of blade castings in heat treatment process determines their geometrical accuracy, and improper control of it may result in additional repair, shape righting, or even rejection. This article presents a novel approach for discovering the distortion behavior of heavy blade castings during heat treatment process in production. Real-time measurements of distortion and temperature field of a heavy hydro turbine blade casting weighted 17 ton during forced air cooling in normalizing treatment process were carried out by using deformation measurement instruments and an infrared thermal imaging camera. The distortion processes of the typical locations of blade and the temperature field of the blade were obtained. One corner on the blade outlet edge side exhibits variation of distortion with two peaks and a valley. The range reaches 97 mm and the final distortion value is 76 mm. The maximum temperature difference on blade surface reaches 460 °C after 80 min of cooling. Influences of thermal stress and phase transformation stress on the distortion of the blade were elucidated and discussed. The results are of great significance for the understanding and control of the distortion behavior of hydro turbine blades in heat treatment.

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Acknowledgments

The authors gratefully acknowledge the financial supports from the National Eleventh Five-Year Science and Technology Support Program of China through Grant No. 2007BAF02B07, and the State Basic Research Key Projects (973) of China through Grant No. 2005CB724105.

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Authors and Affiliations

  1. Key Laboratory for Advanced Materials Processing Technology of Ministry of Education, Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China

    Hai-liang Yu, Jin-wu Kang, Tian-jiao Wang, Ji-yu Ma, Yong-yi Hu & Tian-you Huang

  2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110004, China

    Hai-liang Yu

  3. Harbin Electric Machinery Company Limited, Harbin, 150040, China

    Shi-bin Wang, Ying Wu, Cheng-chun Zhang, Yan-tao Dai & Peng Li

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  1. Hai-liang Yu
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  2. Jin-wu Kang
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  3. Tian-jiao Wang
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  9. Cheng-chun Zhang
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  10. Yan-tao Dai
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  11. Peng Li
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Correspondence to Hai-liang Yu or Jin-wu Kang.

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Yu, Hl., Kang, Jw., Wang, Tj. et al. Distortion Behavior of a Heavy Hydro Turbine Blade Casting During Forced Air Cooling in Normalizing Treatment Process. J. of Materi Eng and Perform 21, 55–61 (2012). https://doi.org/10.1007/s11665-010-9819-6

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  • DOI: https://doi.org/10.1007/s11665-010-9819-6

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