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.
钢中的残余有害元素致使钢材产生红脆性表面裂纹和具有回火脆性倾向，并使耐热钢的热强性降低。
The residual deleterious elements in steel lead to products occurring red brittleness surface crack and temper brittleness, and lead to hot strength of heat resistant steel decreasing.
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.
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