Adoption of speeded changing could reduce the degree of carbide segregation more than 3 grades whereas repeated upsetting and drawing-out could only reduce 1-1.5 grades.

本文通过大量试验和机理的研究，高速钢锻件经过反复镦拔。 只能降低炭化物偏析度1～1.5级。

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The effective measures are presented bo avoid zonal segregation of carbide.

提出了避免碳化物带状偏析的有效措施。

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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.

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。

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