【摘要】：實驗用鋼在低碳錳鋼基礎上采用鋯脫氧及鈦微合金化,研究了連續(xù)冷卻和等溫熱處理條件下的組織轉變行為,分析了夾雜物的析出類型及對組織轉變的影響機理.統(tǒng)計結果表明:夾雜物在0.2~1μm尺寸范圍內有較高的數(shù)量密度,主要為Zr O2·Mn S和Zr O2·Mn S·Ti N復相夾雜,與熱力學分析結果一致.實驗鋼以1℃/s連續(xù)冷卻及500℃等溫時均得到晶內針狀鐵素體組織,促進鐵素體形核的主要夾雜物類型為Zr O2·Mn S·Ti N.Mn S以Zr O2為核心復合析出形成貧錳區(qū)是促進鐵素體形核的重要因素,Ti N的復合析出降低了鐵素體形核界面能,進一步促進了針狀鐵素體轉變.
[Abstract]:On the basis of low carbon manganese steel, zirconium deoxidation and titanium microalloying were used to study the microstructure transformation behavior under continuous cooling and isothermal heat treatment. The results show that the number density of inclusions is higher in the range of 0.2 渭 m, mainly composed of ZrO 2 mn S and ZrO 2 Mn S Ti N multiphase inclusions, which is consistent with the thermodynamic analysis. The acicular ferrite microstructure was obtained by continuous cooling at 1 鈩，

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