Abstract
The effect of gas nitriding on fatigue behaviour has been studied in commercial pure titanium under rotating bending. Smooth specimens were nitrided at 850 °C and 1000 °C for 9 h in pure nitrogen gas. The depths of the obtained nitrided layers were approximately 20 μm and 55 μm, respectively. It was found that the fatigue strengths of the nitrided materials were superior to those of the corresponding annealed or untreated materials; in particular, fatigue strength was markedly increased by nitriding at 850 °C, and was higher than that of the material annealed at 700 °C. Based on detailed observations of crack initiation, crack growth and fracture surfaces, it is concluded that the improved fatigue strength of the nitrided materials can be attributed to enhanced resistance to both crack initiation and growth.
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