Transactions of Materials and Heat Treatment

Title：Research and optimization on thermal forming process for a steam turbine blade

Authors： Luo Yingna

Unit： School of Mechanical Engineering and Automation Chongqing Industry Polytechnic College

KeyWords： turbine blades thermal compression Hansel-Spittel model thermal stamping springback thinning

ClassificationCode：TG316；TG146.4

year,vol(issue):pagenumber：2023,48(12):63-71

Abstract：

To improve the thermal stamping quality of a certain steam turbine blade and reduce trial-and-error costs, the stress-strain curves of X2Cr11 steel at different temperatures and strain rates were obtained by isothermal thermal compression tests, and a high-precision Hansel-Spittel constitutive model was constructed. Isothermal compression results indicate that the temperature and strain rate have significant effects on stress in material. Then,based on the established constitutive equation, a numerical simulation model of thermal forming for a specific steam turbine blade was constructed. The problem existing in the original process was preliminarily analyzed including uneven sheet thickness and considerable springback effect. Finally, an optimization strategy based on Latin hypercube, finite element simulation, Kriging model and genetic algorithm was proposed. The maximum springback amount is successfully controlled within 1.5 mm, and the maximum thinning rate is controlled within 3.3%. Production trial production shows that this strategy significantly improves the forming quality of steam turbine blades and reduces the trial-and-error costs. Thus, the research results provide an effective guarantee for the high-quality production of steam turbine blades.

Funds：

重庆市自然科学基金面上项目（CSTB2022NSCQ-MSX1029）；重庆市教育委员会科学技术研究计划青年项目（KJQN202203204）

作者简介：罗应娜（1979-），女，学士，副教授 E-mail：lyn3796@163.com

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