抄録
Fatigue performance and fracture behavior of low carbon and phosphorus-added low carbon steels have been investigated by plane bending fatigue tests at room temperature in air. For all steels, fatigue tests were carried out at a frequency of 1000 cycles per minute. After all mechanical tests, fracture surfaces were cut and examined using scanning electron microscopy to identify the fracture features. At any applied stress level, phosphorus addition further improved the fatigue life of LC steels, however, it decreased life from macrocrack generation to breaking. Cold working increased tensile strength and fatigue strength of LC and LC-P steels, however, it also decreased life from macrocrack generation to breaking, which of LC-P steels is more adversely affected. Annealing decreased tensile strength and fatigue strength of LC and LC-P steels, although, it increased fraction of fatigue limit per fatigue strength.
