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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.5; Jul 7-11, 2003; Leganes, Madrid, Spain >The Crystallization, Structure and Work Hardening of Casting Fe-N-V Alloys
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The Crystallization, Structure and Work Hardening of Casting Fe-N-V Alloys

机译：铸造Fe-N-V合金的结晶，组织和加工硬化

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摘要

The aim of the present study was to investigate the initial state of the as-cast structure of alloys of iron with alloying nitrogen, and the state of structure after their cold plastic working. Tests were carried out using micro-ingots of alloys saturated with nitrogen by the levitation metal melting method. First, Fe-N alloys with two different nitrogen contents were smelted as specimens to be used for describing the reference state (standard specimens). Then, micro-ingots of the principal alloy, i.e. Fe-N-V, were produced, which contained 12 wt.% of vanadium at nitrogen pressures of 0.0284, 0.0568, 0.100 and 0.400 MPa, respectively, and at a temperature of 1973 K. The rate of crystallization of liquid metal cast into small copper ingot moulds was determined from the inter-dendritic parameter. Precipitated nitrides were described by the X-ray method, and microhardness was measured. Then, the cold plastic deformation of those micro-ingots was done, and all tests as for the as-cast state were repeated. The metallographic examination of micro-ingots crystallizing under pressure have shown that they have a structure of highly developed dendrites. It has been shown that in the both cases of nitrogenated alloys the crystallization rate increases with increasing nitrogen pressure inside the reaction chamber. At all obtained crystallization rates in the Fe-N-V (12 wt.%) alloy, nitrides precipitate the more intensively the more nitrogen is contained in the alloy. The hardness level of the as-cast state and of the state after cold plastic working depends, in a natural manner, on the composition and structure of the alloy. The maximum cold work hardening was obtained for the Fe-N-V (12 wt.%) alloy smelted at a nitrogen pressure of 0.0284 MPa.
机译：本研究的目的是研究铁与氮合金的铸态结构的初始状态，以及冷塑性加工后的状态。通过悬浮金属熔化法，使用浸有氮的合金的微合金进行测试。首先，将具有两种不同氮含量的Fe-N合金熔炼为用于描述参考状态的试样（标准试样）。然后，制得主要合金即Fe-NV的微合金，其中分别在0.0284、0.0568、0.100和0.400 MPa的氮气压力下以及在1973 K的温度下包含12 wt％的钒。从枝晶间参数确定铸入小的铜锭模中的液态金属的结晶速率。通过X射线法描述沉淀的氮化物，并测量显微硬度。然后，对那些微锭进行冷塑性变形，并重复所有关于铸态的测试。在压力下结晶的微锭的金相检查表明，它们具有高度发达的枝晶结构。已经表明，在两种氮化合金的情况下，结晶速率都随着反应室内的氮气压力的增加而增加。在Fe-N-V（12 wt。％）合金中所有获得的结晶速率下，氮化物沉淀的强度越高，合金中所含的氮就越多。铸态和冷塑性加工后的状态的硬度水平自然取决于合金的组成和结构。对于在0.0284 MPa的氮气压力下熔化的Fe-N-V（12 wt。％）合金，可获得最大的冷作硬化。

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