Gm Global Technolgoy Operations, Inc.

Purushotham Kunduru

Qigui Wang

Devin R Hess

Cherng-Chi Chang

Yi Liu

Richard L Metcalf

Angela Zsidi Alksninis

An engine block for a vehicle includes a bore surface defining a cylinder bore. The bore surface exhibits a first microstructure and includes a pattern of a plurality of cycloidal features formed in the bore surface. The plurality of cycloidal features each exhibit a first length in a first axis and a second length in a second axis arranged 90 degrees from the first axis. The plurality of cycloidal features also exhibit a ratio of the first length to the second length in a range of 1:1.5 to 1.5:1. The plurality of cycloidal features further exhibit a second microstructure including tempered martensite, wherein the second microstructure is different from the first microstructure. The engine block is included in a vehicle. The cycloidal features are formed with a laser.

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Macomb, MI, United States of America

Purushotham Kunduru