碳化、氰化、感应淬火是局部淬火中经常使用的处理方法。
Carburizing, cyaniding, and induction hardening are some of the processes commonly used to produce the case hardening effect.
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.
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