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首页> 外文期刊>ISIJ international >Effects of Alloying Elements on Sigma Phase Precipitation in Duplex Stainless Steel (2) - Effects of Alloying Chromium, Molybdenum and Tungsten on C-curve of Sigma Phase Precipitation in Duplex Stainless Steel
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Effects of Alloying Elements on Sigma Phase Precipitation in Duplex Stainless Steel (2) - Effects of Alloying Chromium, Molybdenum and Tungsten on C-curve of Sigma Phase Precipitation in Duplex Stainless Steel

机译：合金元素对双相不锈钢西格玛相析出的影响（2）-铬，钼和钨合金化对双相不锈钢西格玛相析出的C曲线的影响

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摘要

The time-temperature-precipitation (TTP) diagram called as C-curve of the sigma phase in duplex stainless steel was investigated to clarify the effect of each amount of alloying elements. Because of the trade-off between the improvement for corrosion resistance and avoiding the sigma phase precipitation regarding the increase of Cr and Mo, it is important to clarify the effect of each alloying elements on the nose temperature and time of the TTP curve which indicates the critical heating condition to be free from harmful phase precipitation. By using 25/28%Cr duplex stainless steel containing various levels of Cr, Mo and W, the TTP curve was obtained experimentally via the microstructure observation test with an optical microscope after heating at various temperatures. The calculated TTP curves were also obtained from the physical model of sigma phase growth rate which has been proposed in the previous work by the authors of this work. Those calculated TTP curves almost agreed with the experimental results. It was possible to explain the influence of alloying elements of Cr, Mo and W on the TTP curve from the effect on the parameters in the kinetic model proposed.
机译：研究了双相不锈钢中被称为σ相的C曲线的时间-温度-沉淀（TTP）图，以阐明每种合金元素的影响。由于要提高耐蚀性并避免Cr和Mo的增加而避免σ相析出之间的权衡取舍，因此重要的是弄清每种合金元素对TTP曲线鼻温和时间的影响，这表明关键的加热条件应避免有害相的沉淀。通过使用含有25、28％Cr，Mo和W含量不同的Cr双相不锈钢，在不同温度下加热后，通过光学显微镜的显微组织观察试验，通过实验获得了TTP曲线。 TTP曲线的计算也是从sigma相生长速率的物理模型获得的，该模型是该工作的作者在先前的工作中提出的。这些计算的TTP曲线几乎与实验结果一致。从对动力学模型参数的影响可以解释Cr，Mo和W合金元素对TTP曲线的影响。

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