Thermomechanical properties of type 316LN stainless steel

Tensile, low cycle fatigue, and thermomechanical tests were conducted at RT∼600 .deg. C for type 316LN stainless steel. Tensile strength decreased with temperature and elongation decreased, was minimum at 400 .deg. C, and increased with temperature. Low cycle fatigue life was almost same up to 300 .deg. C and decreases abruptly with temperature at above 300 .deg. C. Thermomechanical fatigue test was conducted at 300∼600 .deg. C, 2% strain range, in or out of phase, 100 or 50% constraint. Thermomechanical fatigue life of in phase was higher than low cycle fatigue life at 600 .deg. C but that of out of phase was lower than LCF life at 600 .deg. C. This behavior is considered that austenitic stainless steel has high thermal expansion