發(fā)布時(shí)間：2018-10-08 20:39

【摘要】：采用ICP-MS電感耦合等離子質(zhì)譜儀、JEM-2100透射電鏡及L78淬火熱膨脹儀等設(shè)備,結(jié)合對(duì)La界面擴(kuò)散系數(shù)的測(cè)定,研究了固溶稀土元素在鋼中的存在及對(duì)過(guò)冷奧氏體轉(zhuǎn)變的影響。結(jié)果表明,稀土在鋼中有一定固溶量。微量的固溶稀土存在于晶界、位錯(cuò)等晶體缺陷處。固溶稀土元素可推遲過(guò)冷奧氏體的轉(zhuǎn)變,使CCT曲線向右下方移動(dòng)。固溶稀土原子塞集于晶界等缺陷處,阻礙擴(kuò)散或熱激活過(guò)程,延遲了新相的形核-長(zhǎng)大,是推遲過(guò)冷奧氏體轉(zhuǎn)變的主要原因。
[Abstract]:By means of ICP-MS inductively coupled plasma mass spectrometer, JEM-2100 transmission electron microscope and L78 quenching thermal expansion instrument, the existence of solid solution rare earth elements in steel and its effect on the transformation of undercooled austenite were studied by combining with the measurement of the diffusion coefficient of La interface. The results show that rare earth has a certain amount of solid solution in steel. Trace amount of solid solution rare earth exists in grain boundary, dislocation and other crystal defects. Solid solution of rare earth elements can delay the transformation of subcooled austenite and make the CCT curve move to the lower right. The solid solution rare earth atoms are concentrated at the grain boundary, which hinders the process of diffusion or thermal activation, and delays the nucleation and growth of the new phase, which is the main reason for delaying the transformation of undercooled austenite.
【作者單位】： 內(nèi)蒙古科技大學(xué)材料與冶金學(xué)院;內(nèi)蒙古自治區(qū)白云鄂博礦多金屬資源綜合利用重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51261018) 內(nèi)蒙古自然科學(xué)基金資助項(xiàng)目(2012MS0805) 內(nèi)蒙古科技大學(xué)創(chuàng)新基金資助項(xiàng)目(2011NCL037)
【分類(lèi)號(hào)】：TG142.1

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