To provide a friction-welded member having an excellent fatigue resistant property, and further to provide a method for improving the fatigue resistant property.
The friction-welded member is made of a steel material containing 0.1 to 0.8 mass% of C, 0.05 to 2.5 mass% of Si, 0.2 to 3 mass% of Mn, 0.005 to 0.1 mass% of Al, 0.001 to 0.02 mass% of N, and the remainder of Fe and unavoidable impurities, and has a tensile strength of 600 MPa or higher, wherein the compressive residual stress at the surface of a welded portion 3 is 50 to 90% of the tensile strength of the steel material. Further, the stress concentration in the welded portion is relaxed by reducing uneven portions and burrs in the welded portions by peening the surface of the welded portions of the steel material with an ultrasonic vibration terminal 5 vibrating at a frequency of 10 to 60 kHz with an amplitude of 0.3 to 50 μm.
OCHI TATSURO
YOSHIDA TAKU
| JP2003053586A | 2003-02-26 | |||
| JP2003113418A | 2003-04-18 | |||
| JPH07171688A | 1995-07-11 | |||
| JPH0577063A | 1993-03-30 | |||
| JPS63286517A | 1988-11-24 | |||
| JPH0421717A | 1992-01-24 |
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Nagasaka Tomoyasu
Masaya Nishiyama