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马氏体时效钢的韧性随其强度的提高而下降。本文着重研究影响马氏体时效钢韧性与塑性下降的因素,也研究了真空感应冶炼、真空电弧重熔与电子束精炼工艺对排除马氏体时效钢中杂质的影响。研究结果表明,间隙元素C、S、N、O与其它杂质元素对马氏体时效钢的韧性与塑性的影响很大。马氏体时效钢中Ti(C、N)含量的增加会降低其断裂韧性与面缩率。真空感应冶炼加真空电弧重熔不仅能准确地控制马氏体时效钢中的化学成分,还能有效地排除其中有害杂质元素。电子束重熔工艺能更有效地排除马氏体时效钢中锑、铅、锡及其它杂质元素,也能进一步脱除马氏体时效钢中的碳与氧含量,因此能提高马氏体时效钢的断裂韧性与塑性。
The toughness of martensitic steel decreases with its strength. This paper focuses on the factors that affect the ductility and ductility of martensitic steel, and also studies the effects of vacuum induction melting, vacuum arc remelting and electron beam refining on the exclusion of martensitic steel. The results show that the interstitial elements C, S, N, O and other impurity elements have a great influence on the ductility and plasticity of the martensitic steel. The increase of Ti (C, N) content in martensitic steel will decrease its fracture toughness and reduction ratio. Vacuum induction smelting plus vacuum arc remelting can not only accurately control the chemical composition of martensitic aging steel, but also effectively exclude the harmful impurity elements. Electron beam remelting process can be more effective in the elimination of martensitic steel antimony, lead, tin and other impurity elements, but also can be further removed martensitic steel carbon and oxygen content, it can improve the martensite aging Steel fracture toughness and plasticity.