Improvement of wear resistance for engine valve: introducing cold upsetting treatment on valve seating face
journal contribution
posted on 2025-01-29, 17:21authored byFuqiang Lai, Changsheng Cao, Chuangwei Shi, Ge Sun, Rong Qu, Dongqiang Mo, Youxi Lin, Shengguan Qu, Roger Lewis, Tom SlatterTom Slatter, Xin Xue
This study presents a new surface strengthening technique (cold upsetting manufacturing process) for engine valve seating face (VSF). The properties of the Ni30 superalloy VSF were characterized before and after cold upsetting. Compared to the solution-aging treatment (SAT) valve, the solution-cold upsetting-aging treatment (SCUAT) valve hardness was increased by 60 HV0.2. SCUAT valves exhibited higher internal dislocation degrees and local misorientation than SAT valves. Bench-top wear tests at 650 °C and 750 °C were conducted. The valve wear loss at 650 °C was higher than that at 750 °C. SCUAT valves show better wear resistance, with a total wear loss reduction up to 26.76 %. The SCUAT valve-seat insert contact pair wear mechanisms are adhesive and fatigue wear.
Funding
National Natural Science Foundation of China (Grant No.52205185 and No.12272094)
History
School
Mechanical, Electrical and Manufacturing Engineering