CYCLIC BEHAVIOR OF A SUPERFERRITIC STAINLESS STEEL AT ROOM AND INTERMEDIATE TEMPERATURES

SILVINA HEREÑÚ; MARÍA GABRIELA MOSCATO; IRIS ALVAREZ-ARMAS; ALBERTO F. ARMAS

Brno

Encuentro; XVI International Colloquium "Mechanical Fatigue of Metals"(ICMFM-XVI); 2012

Institute of Physics of Materials, Academy of Sciences of the Czech Republic

This paper studies the influence of temperature on the cyclic behavior of superferritic stainless steel UNS S 44600 in two conditions: as-received (unaged, UA) and aged (100 hours at 475ºC, AG). In some specimens a thermal treatment at 1100 ºC (TT) followed by water quenching is carried out in order to reduce the dislocation density and produce the dissolution of precipitates in UA condition. Due to this TT needled-like particles precipitate producing an even worst embrittlement that spinodal decomposition. Cyclic test at 475oC shows dynamic strain aging (DSA)manifestations in UA samples whereas enhance fatigue life in AG samples.oC shows dynamic strain aging (DSA)manifestations in UA samples whereas enhance fatigue life in AG samples.