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首页> 外文期刊>Journal of Materials Engineering and Performance >Continuous Cooling Transformation in Cast Duplex Stainless Steels CD3MN and CD3MWCuN
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Continuous Cooling Transformation in Cast Duplex Stainless Steels CD3MN and CD3MWCuN

机译：铸造双相不锈钢CD3MN和CD3MWCuN的连续冷却转变

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摘要

The kinetics of brittle phase transformation in cast duplex stainless steels CD3MN and CD3MWCuN was investigated under continuous cooling conditions. Cooling rates slower than 5 °C/min. were obtained using a conventional tube furnace with a programable controller. In order to obtain controlled high cooling rates, a furnace equipped to grow crystals by means of the Bridgman method was used. Samples were soaked at 1100 °C for 30 min and cooled at different rates by changing the furnace position at various velocities. The velocity of the furnace movement was correlated to a continuous-cooling-temperature profile for the samples. Continuous-cooling-transformation (CCT) diagrams were constructed based on experimental observations through metallographic sample preparations and optical microscopy. These are compared to calculated diagrams derived from previously determined isothermal transformation diagrams. The theoretical calculations employed a modified Johnson-Mehl-Avrami (JMA) equation (or Avrami equation) under assumption of the additivity rule. Rockwell hardness tests were made to present the correlation between hardness change and the amount of brittle phases (determined by tint-etching to most likely be a combination of sigma + chi) after cooling.
机译：在连续冷却条件下，研究了铸态双相不锈钢CD3MN和CD3MWCuN的脆性相变动力学。冷却速度低于5°C / min。使用具有可编程控制器的常规管式炉获得。为了获得受控的高冷却速率，使用了配备有通过Bridgman方法生长晶体的熔炉。将样品在1100°C下浸泡30分钟，然后通过以不同的速度改变熔炉位置以不同的速率冷却。炉子移动的速度与样品的连续冷却温度曲线相关。基于金相样品制备和光学显微镜的实验观察，构建了连续冷却转变（CCT）图。将这些与从先前确定的等温转变图得出的计算图进行比较。在计算可加性规则的情况下，理论计算采用了改进的Johnson-Mehl-Avrami（JMA）方程（或Avrami方程）。进行了洛氏硬度测试，以显示冷却后硬度变化与脆性相数量（由色相蚀刻确定为最可能是sigma + chi的组合）之间的相关性。

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