2011•Turbine TechnologyRequires access

Fracture Reason Analysis of Last Stage Blade of 200MW Steam Turbine

Liu Yu-zhi

Abstract

Fracture reason of last stage blade of power plant 200MW steam turbine was analyzed.The fracture surface of blade was analyzed and observed by means of metallurgical microscope test,mechanical properties test,elemental composition analysis and macro test,scanning electron microscopy together with energy dispersive spectrometry.Analysts believed that the fracture surface was typical fatigue-fracture;crack source was located in the steam side of the blade at some corrosion pits.Because the water-corrosion zone leaded to stress concentration,the blade was low toughness and Sulfur elements composition segregation.Alternating stress and residual stress together leaded to the produce and expands of fatigue crack in operation of steam turbine.

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Key concepts: Fracture (geology), Metallurgy, Blade (archaeology), Corrosion fatigue, Fracture toughness, Steam turbine, Scanning electron microscope, Materials science