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Updated: May 20, 2025

Ultrasonic Fatigue Testing in the Tension-Compression Mode
Published on: March 7, 2018
Surface Characteristics and Fatigue Resistance of Ultrasonic Rolling-Treated 20Cr1Mo1V1A Valve Stem
Shuailing Lan1, Fan Chen2, Wenbo Bie2,3
1School of Intelligent Manufacturing, Kaifeng University, Kaifeng 475003, China.
Abstract:
The valve stem made of 20CrMo1V1A has low surface resistance and high susceptibility to corrosion, significantly curtailing its service life. To address these issues, a high-quality ultrasonic rolling (USR) technology was applied to the 20CrMo1V1A stainless steel valve stem to enhance its corrosion resistance and mechanical properties. Subsequently, fatigue and corrosion tests were conducted on the valve stem. The results indicate that USR produces surfaces with a roughness average (Ra) of 0.3 μm and a gradient nanostructure on the valve stem surface. This unique microstructural modification resulted in a 27% improvement in surface hardness and nearly a three-fold grain size reduction. Additionally, the friction coefficient and electrochemical corrosion rate dropped by 47% and 32%, respectively. Therefore, USR was applicable for enhancing multiple properties of valve components as an additional final processing step for achieving high-performance valve stems.
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