【摘要】：實(shí)驗(yàn)用鋼在低碳錳鋼基礎(chǔ)上采用鋯脫氧及鈦微合金化,研究了連續(xù)冷卻和等溫?zé)崽幚項(xiàng)l件下的組織轉(zhuǎn)變行為,分析了夾雜物的析出類(lèi)型及對(duì)組織轉(zhuǎn)變的影響機(jī)理.統(tǒng)計(jì)結(jié)果表明:夾雜物在0.2~1μm尺寸范圍內(nèi)有較高的數(shù)量密度,主要為Zr O2·Mn S和Zr O2·Mn S·Ti N復(fù)相夾雜,與熱力學(xué)分析結(jié)果一致.實(shí)驗(yàn)鋼以1℃/s連續(xù)冷卻及500℃等溫時(shí)均得到晶內(nèi)針狀鐵素體組織,促進(jìn)鐵素體形核的主要夾雜物類(lèi)型為Zr O2·Mn S·Ti N.Mn S以Zr O2為核心復(fù)合析出形成貧錳區(qū)是促進(jìn)鐵素體形核的重要因素,Ti N的復(fù)合析出降低了鐵素體形核界面能,進(jìn)一步促進(jìn)了針狀鐵素體轉(zhuǎn)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，

本文編號(hào)：2145168