高建钢不同位置铁素体相变析出行为研究

Study on the Transformation and Precipitation Behavior of Ferrite at Different Positions in High-rise Building Steel

利用高温激光共聚焦显微镜对高建钢针状铁素体的相变析出行为进行原位观察,并将其分类为晶界面、晶界棱和夹杂物析出铁素体,就其形核位置及长大速率进行理论分析。发现晶界铁素体存在生长速率不均匀与生长过程发生偏转两个普遍的生长特性;发现了铁素体的三种形核位置析出铁素体的先后顺序;最后通过原为观察揭示了不同位置析出铁素体的生长特性。

The phase transformation and precipitation behavior of acicular ferrite in high-rise construction steel was observed in situ by high temperature laser confocal microscope.According to its nucleation site the ferrite can be classified into crystal interface,grain boundary edge and inclusions.The nucleation position and growth rate of acicular ferrite were analyzed theoretically. The following conclusions are drawn:1) the growth rate of grain boundary ferrite is inhomogeneous and the growth process deflects;2) Three kinds of nucleation positions of ferrite and the sequence of ferrite precipitation were found;3) finally,the growth characteristics of ferrite precipitated at different positions were revealed by in-site observation.