求翻译：and core area, respectively. Approximately over 200 Hv increase in surface hardness with Ti-nitriding treatment was observed, regardless of prior heat treatment condition. It was also observed that the overall hardness values for the Q/CT/T specimens, with and without Ti-nitriding, are slightly higher than that for Q/T counterparts. Such a change in hardness with different heat treatment processes would affect the fatigue behavior of tool steel.是什么意思？

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