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Development of High Fatigue-Resistance Steel Wires for Engine Valve Springs
Technical Paper
948325
Sector:
Event:
JSAE Autumn Conference
Language:
Japanese
Abstract
Market demand for reducing weight and size in engine valve
springs requires a higher anti-fatigue property in steel wires for
the springs. High strength materials are necessary to meet the
demand. However, resistance to flaw becomes lower with increasing
strength. Thus, micro flaws that are not harmful on conventional
materials act as starting points for fatigue fracture and prevent
improving the anti-fatigue properly.
We have succeeded in removing harmful micro flaws with
electropolishing and obtained steel wires having a dramatically
improved anti-fatigue properties.