求翻译：In order to understand the reason for the reduced resistance to fatigue for the Ti-nitrided specimens, the fracture surface of fatigue failed specimens was observed by using an SEM. Figure 4 shows the SEM fractographs of fatigued (a) Q/T, (b) Q/CT/T,(c) Q/T + Ti-nitriding and (d) Q/CT/T + Ti-nitriding specimen, respectively. For the specimens without Ti-nitriding treatment, failed carbide particle near surface area tend to是什么意思？

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