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上期我们谈了如何通过锻造降低高速钢的碳化物偏析(不均匀度)问题。但是,高速钢锻造中首先碰到的问题却是如何防止裂纹的产生,如果得不到一件完整的锻件,那么提高锻件的內在质量就变成一句空话。高速钢锻件报废的主要原因是裂纹(当然还有碳化物达不到规定的等级),而且数量很多、很普遍,研究产生裂纹的原因,提出防止措施,对于降低废品率,减少这种贵重材料的损失是很有意义的。
In the previous issue we talked about how to reduce the problem of carbide segregation (non-uniformity) in HSS by forging. However, the first problem encountered in high-speed steel forging is how to prevent the occurrence of cracks. If a complete forging can not be obtained, improving the inherent quality of the forging becomes an empty talk. High-speed steel forgings scrap is mainly due to cracks (of course there are still less than the prescribed level of carbide), but also a large number, very common, to study the causes of cracks, put forward preventive measures to reduce the rejection rate, reduce the precious materials The loss is very significant.