Effects of small amount of additional elements on control of interstitial impurities and mechanical properties of V–4Cr–4Ti–Si–Al–Y alloys
Effects of small amount of additional elements on control of interstitial impurities and mechanical properties of V–4Cr–4Ti–Si–Al–Y alloys
复制标题
少量添加元素对V-4Cr-4Ti-Si-Al-Y合金间隙杂质控制及力学性能的影响
DOI：
10.1016/j.jnucmat.2003.01.001
复制
发表时间：
2004
影响因子：
3.1
通讯作者：
N. Yamamoto
中科院分区：
文献类型：
--
作者：
T. Chuto;M. Satou;A. Hasegawa;K. Abe;T. Muroga;N. Yamamoto
为了提高低活化钒合金的力学性能，研究了悬浮熔炼法制备的几种V-4Cr-4Ti-Si-Al-Y合金中微量Si、Al和Y的加入对合金制造过程中间隙杂质（O、C和N）控制的影响。采用小型化试样对5种V-4Cr-4Ti-Si-Al-Y合金进行了夏比冲击试验和拉伸试验，探讨了这些元素对合金力学性能的影响。在熔化过程中，氧浓度几乎随钇损失的增加而线性下降。在熔化过程中，这种氧还原和钇的损失可能是通过两种机制实现的，它们是：(i)抑制氧气从环境中渗透到熔融材料中；（ii）通过形成Y2O3从基体中获得氧气，Y2O3在熔化过程中漂浮到表面。硅和铝的加入对控制间隙杂质的浓度没有影响。其中，V-4Cr-4Ti-0.1Si-0.1Al-0.1Y合金的冲击性能最好。合金的上层能随钇含量的增加而降低。高数量密度的含钇粗夹杂物会导致合金的冲击性能下降，但对合金的拉伸性能影响不大。即使在较高的钇含量下，未添加Si和Al的V-4Cr-4Ti-Y合金也表现出较高的上层能。
In order to improve the mechanical properties of low activation vanadium alloys for fusion structural applications, effects of small addition of Si, Al and Y on the control of interstitial impurities (O, C and N) during the fabrication process were examined for several V–4Cr–4Ti–Si–Al–Y alloys produced by the levitation melting method. Charpy impact tests and tensile tests were carried out for five kinds of V–4Cr–4Ti–Si–Al–Y alloys using miniaturized specimens for the purpose of evaluating the effects of these elements on mechanical properties. Oxygen concentration decreased almost linearly with increasing loss of yttrium during melting. This oxygen reduction with yttrium loss during the melting process may have been achieved by two types of mechanisms, they are, (i) suppression of oxygen penetration into the molten materials from the environment and (ii) getting of oxygen from the matrix by forming Y2O3, which floats to the surface during the melting. There was no effect of Si and Al addition to control the concentration of interstitial impurities. V–4Cr–4Ti–0.1Si–0.1Al–0.1Y alloy showed the best impact properties out of the alloys investigated. Upper-shelf energy of the alloys decreased with increasing yttrium content. High number density of coarse inclusions containing yttrium could cause the degradation of impact properties, though they hardly affect tensile properties of the alloys. Even at higher yttrium contents, V–4Cr–4Ti–Y alloys without addition of Si and Al showed relatively high upper-shelf energy.