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首页> 外文期刊>Journal of Materials Engineering and Performance >Titanium in the Rapidly Cooled Hypereutectic Gray Iron
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Titanium in the Rapidly Cooled Hypereutectic Gray Iron

机译：快速冷却的过共晶灰铁中的钛

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The effect of titanium on the structure and properties of a rapidly cooled hypereutectic cast gray iron has been studied on the example of permanent mold (PM) casting. A microstructure study showed that titanium is a relatively strong element in controlling solidification structure by increasing undercooling and thus promoting type D graphite. The effectiveness of titanium additions depends on the base iron carbon equivalent (CE) with more pronounced changes in iron with a lower CE. The undercooling ability of the titanium decreases after exceeding a certain level. Increasing titanium from 0.09-0.12 percent slightly increases undercooling in iron with lower CE, but this effect was reduced in a more strongly hypereutectic iron. Alloying with titanium generally improves tensile strength, but the effectiveness of titanium additions also depends on the base iron CE range. Scanning electon microscope (SEM) studies revealed that most of the titanium-containing compounds were located in the metallic matrix: titanium carbides have been found in pearlite, while titanium nitrides and carbonitrides were located in ferrite. The presence of large amounts of extremely hard titanium-containing compounds, which often appear with steadite in a relatively high phosphorous content PM gray iron, amplifies the negative effect of titanium on machinability. This study suggests that for optimal combination of tensile strength/microstructure with good machinability, the titanium content in PM gray iron should not exceed 0.075 percent.
机译：在永久铸模（PM）铸造的实例上，已经研究了钛对快速冷却的过共晶铸铁的组织和性能的影响。显微组织研究表明，钛是通过增加过冷度从而促进D型石墨来控制凝固组织的相对强元素。钛添加的有效性取决于基础铁碳当量（CE）以及具有较低CE的铁的更明显变化。超过一定水平后，钛的过冷能力降低。钛从0.09％到0.12％的增加会稍微降低CE较低的铁的过冷度，但是在更强的过共晶铁中这种作用会降低。与钛合金化通常可以提高抗拉强度，但是添加钛的有效性还取决于母材CE的范围。扫描电子显微镜（SEM）研究表明，大多数含钛化合物位于金属基质中：在珠光体中发现碳化钛，而氮化钛和碳氮化物位于铁素体中。大量极硬的含钛化​​合物的存在（通常在较高磷含量的PM灰铁中与硬铁矿一起出现）放大了钛对可加工性的负面影响。这项研究表明，为使​​拉伸强度/微观结构与良好的可加工性达到最佳组合，PM灰铁中的钛含量不应超过0.075％。

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