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首页> 外文期刊>Journal of Materials Engineering and Performance >Inoculated Slightly Hypereutectic Gray Cast Irons
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Inoculated Slightly Hypereutectic Gray Cast Irons

机译：接种过共晶灰口铸铁

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The current experimental investigation in this article was designed to characterize the structure of mold (M) and ladle (L) inoculated, low-S (0.025 wt.% S), low-Al (0.003 wt.% Al), slightly hypereutectic (CE = 4.4-4.5 wt.%) electric melted gray irons, typical for high performance thin-wall castings. It describes the effect of a Ca, Al, Zr-FeSi inoculant addition of 0-0.25 wt.% on structure characteristics, and compares to similar treatments with hypoeutectic irons (3.5-3.6 wt.% CE, 0.025 wt.% S, and 0.003 wt.% Al). A complex structure including primary graphite, austenite dendrites, and eutectic cells is obtained in hypereutectic irons, as the result of nonequilibrium solidification following the concept of a coexisting region. Dendrites appear to be distributed between eutectic cells at higher eutectic undercooling, while in inoculated irons and for lower undercooling, the eutectic cells are "reinforced" by eutectic austenite dendrites. A Zr, Ca, Al-FeSi alloy appears to be an effective inoculant in low S, low Al, gray cast irons, especially for a late inoculation technique, with beneficial effects on both graphite and austenite phases. First, inoculation influenced the nucleation of graphite/eutectic cell, and then their characteristics. A further role of these active elements directly contributed to form nucleation sites for austenite, as complex (Mn,X)S particles.
机译：本文中的当前实验研究旨在表征接种过的低硫（0.025 wt。％S），低铝（0.003 wt。％Al），低共晶（M）和钢包（L）的结构CE = 4.4-4.5 wt。％）电熔灰铸铁，通常用于高性能薄壁铸件。它描述了添加0-0.25 wt。％的Ca，Al，Zr-FeSi孕育剂对结构特性的影响，并与使用亚共晶铁（3.5-3.6 wt。％CE，0.025 wt。％S和0.003重量％的Al）。由于共存区域概念的不平衡凝固，在过共晶铁中获得了包括一次石墨，奥氏体枝晶和共晶晶胞的复杂结构。在较高的共晶过冷度下，枝晶似乎分布在共晶孔之间，而在接种的铁中，对于较低的过冷度，共晶奥氏体枝晶会“强化”共晶孔。 Zr，Ca，Al-FeSi合金似乎是低硫，低铝，灰口铸铁中的有效孕育剂，特别是对于后期接种技术而言，对石墨和奥氏体相都有有益作用。首先，接种影响了石墨/共晶电池的成核，进而影响了它们的特性。这些活性元素的进一步作用是直接形成复杂的（Mn，X）S颗粒，形成奥氏体的形核部位。

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