| 摘要 |
In order to provide a wear-resistant member which is excellent in wear resistance and pitting resistance, a valve train component is subjected to oxidation treatment to adjust its surface hardness to a preliminary value in a range between 550 and 800, followed by shot peening of at least a contact surface, to adjust the surface hardness to a value in a range between 800 and 1000. In a valve spring retainer, the contact surface is a seating surface against which a valve spring abuts. In a valve lifter, the contact surface is a sliding surface against which a cam lobe abuts. The components subject to the oxidation treatment are each made of a titanium alloy having an alloy composition including from 0.5 to 1.5 wt. % of Fe, from 0.2 to 0.5 wt. % of O and the balance of Ti and unavoidable impurities.
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