Garrett Transportation I Inc.

Franklin Allen

Philippe Renaud

Quentin Roberts

Xiaodong Li

Petr Skara

Michael John Morrissey

Peter Mavrosakis

Michael Morrissey

Li Xiaodong

A process for treating a centrifugal compressor wheel includes a combination of cold expansion of at least part of the bore of the wheel to induce residual compressive stresses in a region around the bore, and surface peening at least parts of the compressor wheel such as the back disk and portions of the blades.

Treatment process for a centrifugal compressor wheel to extend low-cycle fatigue life

A process for cold working of the inner surface of a bore in a centrifugal compressor wheel along only a fractional portion of the bore length (i.e., along less than a full axial length of the bore), thereby creating a zone of compressive residual hoop stress in the metal surrounding the bore where the wheel needs the beneficial residual stress. The process purposefully avoids cold working of the bore at locations adjacent to high-stress areas and features of the wheel, where cold working in such locations could negatively impact the wheel's overall life.

Treatment process for a central bore through a centrifugal compressor wheel to create a deep cylindrical zone of compressive residual hoop stress on a fractional portion of the bore length, and compressor wheel resulting therefrom

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Torrance, CA, United States of America

Franklin Allen