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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Development of a New High-Strength Steel for Low Pressure Steam Turbine End-Stage Blades
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Development of a New High-Strength Steel for Low Pressure Steam Turbine End-Stage Blades

机译：开发用于低压汽轮机末级叶片的新型高强度钢

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摘要

Influenced by the growing share of Renewable Energies, higher flexibility and increased efficiency of fossil power plants as well as improved cost efficiency in production of turbine components are evident market trends. Daily cycling in turbine operations leads to advanced requirements for robust design especially of rotating parts. Low pressure (LP) steam turbine end-stage blades with larger exhaust areas are one lever to increase the efficiency of the turbine by reduction of exhaust losses and also to realize cost-efficient single flow exhaust applications. Consequently, blade steels with improved mechanical properties are required. The results of the development of a new high-strength precipitation-hardening (PH) steel for LP end-stage blade application with significantly enhanced material properties are reported. The paper covers the testing strategy applied and information on crucial material parameters like improved low cycle and high cycle fatigue (HCF) behavior while keeping good stress corrosion cracking (SCC) resistance and corrosion fatigue (CF) properties. Furthermore, first manufacturing experiences and validation results from a full-scale component test rig are presented.
机译：受可再生能源份额增长的影响，化石电厂更高的灵活性和更高的效率以及涡轮组件生产中更高的成本效率是显而易见的市场趋势。涡轮机运行中的日常循环导致对坚固设计（尤其是旋转零件）的高级要求。具有较大排气面积的低压（LP）蒸汽轮机末级叶片是一种通过减少排气损失来提高涡轮效率并实现具有成本效益的单流排气应用的杠杆。因此，需要具有改善的机械性能的刀片钢。报道了用于LP末级叶片应用的新型高强度沉淀硬化（PH）钢的开发结果，该材料具有显着增强的材料性能。本文涵盖了所应用的测试策略以及有关关键材料参数的信息，例如改进的低循环和高循环疲劳（HCF）行为，同时保持了良好的抗应力腐蚀开裂（SCC）和腐蚀疲劳（CF）性能。此外，还介绍了全尺寸组件测试台的首次制造经验和验证结果。

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