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首页> 外文会议>Materials Science amp; Technology 2003 Meeting; Nov 9-12, 2003; Chicago, Illinois, USA >PERITECTIC REACTION IN THE IRON-CARBON, IRON-NICKEL, AND IRON-CHROMIUM-NICKEL SYSTEMS
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PERITECTIC REACTION IN THE IRON-CARBON, IRON-NICKEL, AND IRON-CHROMIUM-NICKEL SYSTEMS

机译：铁-碳，铁-镍和铁-铬-镍系统中的蠕变反应

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摘要

The Confocal Scanning Laser Microscope (CSLM) at Carnegie Mellon University has been used to study austenite formation during the peritectic transition in iron-carbon, iron-nickel, and iron-chromium-nickel alloys. The CSLM is a unique tool that allows the in-situ observation of high-temperature phenomena through the combination of an image furnace, He-Ne laser, and confocal optics. The first stage of the peritectic transition - the reaction stage, involving the austenite phase growing along the ferrite/liquid boundary - has been observed. For the iron-nickel alloy it was found that for both the hypoperitectic and hyperperitectic alloys the rate of austenite growth increases with increased undercooling. As expected the austenite growth rates for the interstitial alloy (iron-carbon) are faster than those for the substitutional (iron-nickel). Finally, the reaction rate was measured for an iron-chromium-nickel alloy and it was found that the rates are comparable with those observed in the pure iron-nickel alloy. This suggests that the reaction rate might be controlled by the diffusion of nickel in both cases.
机译：卡内基梅隆大学的共聚焦扫描激光显微镜（CSLM）已用于研究铁-碳，铁-镍和铁-铬-镍合金的包晶转变过程中的奥氏体形成。 CSLM是一种独特的工具，它可以通过结合成像炉，He-Ne激光器和共焦光学器件来现场观察高温现象。已经观察到包晶转变的第一阶段-反应阶段，包括沿铁素体/液体边界生长的奥氏体相。对于铁-镍合金，发现对于过晶和过晶的合金，奥氏体的生长速率都随着过冷度的增加而增加。不出所料，间隙合金（铁碳）的奥氏体生长速度快于替代合金（铁镍）的奥氏体生长速度。最后，测量了铁铬镍合金的反应速率，发现该速率与在纯铁镍合金中观察到的速率相当。这表明在两种情况下，反应速率都可以由镍的扩散来控制。

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