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It is proved that the pressmark of tooth root, the state of carbide and remanentelements in the material have different effects on the toughness of POwer hacksaw blades. 結果証明，機用鋸條的分齒壓痕、基躰碳化物狀況以及材料中的殘存元素等對機用鋸條的靭性有不同程度的影響。