BENEFICIAL EFFECTS INDUCED BY HIGH TEMPERATURE CYCLING

A. F. ARMAS; S. DEGALLAIX; G. DEGALLAIX; S. HEREÑÚ; M. C. MARINELLI; I.ALVAREZ-ARMAS

BEXCO, Busan, Korea

Conferencia; 10th International Conference on The Mechanical Behavior of Materials; 2007

Korean Institute of Metals and Materials

Keywords: Duplex stainless steel, fatigue, embrittlement, high temperature.Duplex stainless steel, fatigue, embrittlement, high temperature. Abstract The cyclic behavior of type DIN 1.4460 duplex stainless steels in as-received and aged conditions was investigated at room temperature and at 500oC. At room temperature, the aged samples showed embrittlement effects such as loss of toughness and reduction of fatigue life. At 500oC, beneficial effects of the synergy between temperature and strain cycling were observed. It is proposed that at high temperature in the ferrite the strain cycling can decompose the chemical composition fluctuations, promoting a demodulation of the spinodal decomposition formed by aging.The cyclic behavior of type DIN 1.4460 duplex stainless steels in as-received and aged conditions was investigated at room temperature and at 500oC. At room temperature, the aged samples showed embrittlement effects such as loss of toughness and reduction of fatigue life. At 500oC, beneficial effects of the synergy between temperature and strain cycling were observed. It is proposed that at high temperature in the ferrite the strain cycling can decompose the chemical composition fluctuations, promoting a demodulation of the spinodal decomposition formed by aging.