Engineering

Residual stress

Software-defined radio

Metallurgy

Materials science

Cartography

Layer (electronics)

Telecommunications

Ultrasonic sensor

Universal Software Radio Peripheral

Computer science

Acoustics

Surface roughness

Physics

Geography

Microstructure

Electronic engineering

Artificial intelligence

Composite material

Tribology

Surface layer

Wireless

Bearing (navigation)

Hardness

Tribology International

To prolong service life of M50 steel for the main shaft bearing, ultrasonic surface rolling process (USRP) was utilized to improve surface performances. The effects of USRP on surface integrity and tribological behavior were investigated. The results show the effect of USRP parameters on surface performances follows the order: feed rate > load > rolling times. During the USRP treatment, plastic deformation layer with 24 µm thickness is formed, and fine grain strengthening increases the microhardness (15.56%) and residual stress (79.61%) and decreases the surface roughness (−68.09%), respectively. Friction coefficient and wear rate of USRP sample are lower than those of untreated sample, because USRP helps form a smooth tribolayer and changes the main wear mechanism to slight adhesive wear.

Microstructure and tribological performances of M50 bearing steel processed by ultrasonic surface rolling