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首页> 外文期刊>ISIJ international >Grain Refinement of Heat Affected Zone in High Heat Input Welding by Liquid Phase Pinning of Oxy-Sulfide
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Grain Refinement of Heat Affected Zone in High Heat Input Welding by Liquid Phase Pinning of Oxy-Sulfide

机译：液相硫化氧硫化法精制高热输入焊接热影响区的晶粒

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摘要

The effect of REM (Ce,La,Nd) addition on austenite grain refinement in the heat affected zone in Fe-0.07/C-0.05/Si-1.5/Mn-0.003/S (mass%) steel was investigated by microstructural observation by SEM/EDS and thermodynamic analysis. It was found that the 30 ppm of REM addition is most effective for reducing the austenite grain size in annealing at 1450°C for 10 sec, but the grain size increases with increasing REM contents of more than 30 ppm. Since the total numbers of precipitates of oxides, sulfides and oxysulfides increase with increasing REM contents, this austenite grain growth cannot be explained by Zener’s pinning model. A thermodynamic calculation showed that REM oxides and MnS in oxysulfides are formed by the miscibility gap in 30 ppm REM steel, which results in the formation of liquid MnS-rich precipitates due to eutectic reaction. On the other hand, the melting temperature of MnS-rich precipitates increases with increasing REM in oxysulfides, and the solid precipitate particles are not effective for inhibiting grain growth. It is suggested that austenite grain growth is suppressed by the liquid phase pinning effect of MnS-rich precipitates.
机译：通过显微组织观察，研究了添加REM（Ce，La，Nd）对Fe-0.07 / C-0.05 / Si-1.5 / Mn-0.003 / S（质量％）钢热影响区奥氏体晶粒细化的影响。 SEM / EDS和热力学分析。已经发现，在1450℃下退火10秒时，添加30ppm的REM最有效地减小奥氏体晶粒尺寸，但是当REM含量超过30ppm时，晶粒尺寸增加。由于氧化物，硫化物和氧硫化物的析出物总数随REM含量的增加而增加，因此这种奥氏体晶粒长大不能用齐纳的钉扎模型来解释。热力学计算表明，氧硫化物中的REM氧化物和MnS是由30 ppm REM钢中的混溶间隙形成的，这导致由于共晶反应而形成富含MnS的液态沉淀。另一方面，随着含氧硫化物中REM的增加，富含MnS的沉淀物的熔融温度升高，并且固体沉淀物颗粒对于抑制晶粒生长无效。建议通过富MnS析出物的液相钉扎效应抑制奥氏体晶粒的生长。

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