Influence of Si addition on the carbon partitioning process in martensitic-austenitic stainless steels
Influence of Si addition on the carbon partitioning process in martensitic-austenitic stainless steels
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DOI：
10.1088/1757-899x/373/1/012001
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Q. Huang;O. Volkova;BC De Cooman;H. Biermann;J. Mola
中科院分区：
文献类型：
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作者：
Q. Huang;O. Volkova;BC De Cooman;H. Biermann;J. Mola
研究了硅对不锈钢淬火分配(Q&P)过程中碳分配效率的影响。为此，在Fe-13Cr-0.47C标准钢中添加了2质量%的Si。在膨胀仪中对无硅钢(参照钢)和加硅钢进行了Q&P循环。通过测定终冷至室温时形成的二次马氏体的淬火温度与马氏体初生温度之间的温度区间，评价了两种钢中奥氏体的富碳情况。在淬火温度马氏体组分相当的Q&P循环中，两种钢的奥氏体析出后的富碳情况相似。为了比较奥氏体力学稳定性，两种钢的Q&P处理样品在20-200℃的温度范围内进行了拉伸试验，淬火温度和分配温度分别为室温和450℃。Si的加入对奥氏体力学稳定性没有显著影响。结果表明，在不锈钢中添加硅对渗碳体的形成有抑制作用，但对奥氏体富碳量没有明显影响。
The effect of Si on the efficiency of carbon partitioning during quenching and partitioning (Q&P) processing of stainless steels was studied. For this purpose, 2 mass-% Si was added to a Fe-13Cr-0.47C reference steel. The Si-free (reference) and Si-added steels were subjected to Q&P cycles in dilatometer. The carbon enrichment of austenite in both steels was evaluated by determining the temperature interval between the quench temperature and the martensite start temperature of secondary martensite formed during final cooling to room temperature. In Q&P cycles with comparable martensite fractions at the quench temperature, the carbon enrichment of austenite after partitioning was similar for both steels. To compare the mechanical stability of austenite, Q&P-processed specimens of both steels were tensile tested in the temperature range 20-200 °C. The quench and partitioning temperatures were room temperature and 450 °C, respectively. Si addition had no meaningful influence on mechanical stability of austenite. The results indicate that the suppression of cementite formation by Si addition to stainless steels, as confirmed by transmission electron microscopy examinations, has no noticeable influence on the carbon enrichment of austenite in the partitioning step.