利用OM, SEM, TEM, EDS和SAEDP等方法对4种不同Ti含量的低碳Ti-Mo全铁素体基体微合金钢中析出相的尺寸、形貌、分布特征和类型进行了研究. 结果表明, 钢中存在2种尺寸差异明显的析出相: 一种为纳米尺度粒子, 是 Ti和Mo的复合碳氮化物, 尺寸小于10 nm, 呈球形, 主要为晶内析出, 呈链状或弥散分布, 位错节点和位错网是纳米尺度析出相的优先形核位置: 另一种为大颗粒析出相, 是Ti的碳氮化物, 数量很少, 尺寸为200-300 nm, 呈方形, 带有“帽口”. 常温和高温拉伸实验表明, 全铁素体纳米尺度析出钢具有良好的力学性能, 其中No.4钢在600℃屈服强度仍然维持在约300 MPa, 具有良好的高温性能.
The morphology, size, distribution and types of precipitate particles were studied by using OM, SEM, TEM, EDS and SAEDP for Ti-Mo low-carbon ferrite matrix micro-alloy steel with four different titanium contents. Experimental results indicated that there were two kinds of particles with obvious different sizes in ferrite matrix, one was nanometer sized particles, which were smaller than 10 nm, the composition of these particles was compound carbonitride of Ti and Mo. These particles precipitated in chains or dispersed in the interior of grains. Dislocation nodes and the dislocation network were preferential nucleation sites for these particles. Another kind of particles was titanium carbonitride larger particles with a “cap” and few in number in ferrite matrix. Their size was about 200 to 300 nm and morphology was square. Tensile experimental results at room temperature and high temperatures showed that ferrite matrix micro-alloy steel with nanometer sized had good mechanical properties. No.4 steel had good performance at 600 ℃ with a yield strength of about\linebreak 300 MPa.
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