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对00Cr12N iNbTi铁素体不锈钢进行加热、粗轧、精轧及卷取过程的模拟实验,应用扫描电镜、透射电镜、化学相分析及热模拟等方法对试样中析出物进行了定性定量分析。结果表明:加热到1140℃,保温0、45和90 m in后,粒子主要为TiN,Ti的固溶率为66.3%,N的固溶率为1.3%;从粗轧到精轧,微米级的小颗粒减少,大颗粒增多,颗粒平均尺寸由1.8μm增大到3.2μm,有聚集长大现象;在热轧过程中微米级粒子形貌为方形或球形,基本保持稳定;纳米级的(Nb,Ti)C颗粒在精轧阶段开始析出,卷取保温及缓冷至室温过程中大量析出,多分布于晶界及晶内处,在较高温度下卷取会析出较多的纳米级(Nb,Ti)C颗粒。
The experiments of heating, roughing, finishing and coiling of 00Cr12N iNbTi ferritic stainless steel were carried out. The precipitates in the sample were qualitatively and quantitatively analyzed by scanning electron microscopy, transmission electron microscopy, chemical phase analysis and thermal simulation. The results show that the solid solution rate of TiN is 66.3% and the solid solution rate of N is 1.3% after heated to 1140 ℃, holding for 0,45 and 90 mins, respectively. From rough rolling to finish rolling, The size of small particles increased, the average particle size increased from 1.8μm to 3.2μm, and the phenomenon of aggregation and growth was observed. The morphology of the micron-sized particles was square or spherical in the hot rolling process and remained basically stable. The nanoscale Nb, Ti) C particles begin to precipitate at the finish rolling stage, a great deal of precipitation occurs during coiling and slowly cooling to room temperature, which are distributed in the grain boundaries and grains. When coiled at higher temperature, more nano-scale (Nb, Ti) C particles.