严重的碳化物带状偏析，使拉刀产生局部淬火过热和回火不足，造成内应力急剧增高，最终导致拉刀断裂。
It was found that the broach was locally overheated due to band segregation of carbide, and under-tempered. These factors caused fracture of broach as a result of high internal stress.
龙门刨床身等关键件的回火、震动时效、超音频淬火等热处理工艺，使机床精度更稳定，使用寿命更长。
Heat treatment technics such as tempering, vibration aging, induction quenching and so on adopted on key parts like bed enable more stable accuracy and longer working life.
床身等关键件的回火、震动时效、超音频淬火等热处理工艺，使机床精度更稳定，使用寿命更长。
Heat treatment technics such as tempering, vibration aging, induction quenching and so on adopted on key parts like bed enable more stable accuracy and longer working life.
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