Mechanical Surface Treatment Technologies for Improving HCF Strength and Surface Roughness of Blisk-Rotors

Abstract

The manufacturing of electron beam welded blade integrated disk (blisk) rotors sets new demands on mechanical surface treatment technologies. High durability and high efficiency of the blades are in general strict requirements for the component and have ideally to be increased by a mechanical surface treatment. The high complex 3D shape of the blades and the need to treat the blades on the rotor caused by a post weld heat treatment are additional challenges to solve. Limited clearance between the blades and low space between the individual blisk’s increase as well the requirements on the technology. Conventional technologies reach their limits and have to be improved. This paper gives an insight into the capabilities of different mechanical surface treatments regarding the treatment of blades on blisk-rotors. Compared with the benchmark shot peening, surface roughness, residual stress depth distribution and high cycle fatigue (HCF) are investigated on deep rolled and vibropeened specimen. Assets and drawbacks are shown and discussed.