Comparative Study on Precipitation Behavior and Texture Formation of Ti-IF Steel and Nb+Ti-IF Steel during Batch Annealing
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摘要: 采用X-衍射仪技术并结合金相显微镜、扫描电子显微镜(SEM)、透射电镜(TEM),研究了加Nb和不加Nb两种罩式退火的无间隙原子钢的金相组织、析出行为及织构。试验结果表明:Nb没有明显改善再结晶织构,但通过Nb增加Ti在点阵中的有效固溶度,在形成TiN、TiC、TiS析出物的同时增加了TiN的数量和尺寸;Nb作为细化晶粒元素在卷曲过程和再结晶退火过程中抑制了晶粒长大,同时使碳氮化物析出颗粒粗大并且降低了γ纤维中的{111}〈110〉织构组分。Abstract: Precipitation behavior and texture formation of the two interstitial-free steels with Nb and without Nb addition during cold rolling-batch annealing process were investigated by using metallographic microscope,scanning electron microscope(SEM),transmission electron microscope(TEM) and X-ray diffraction(XRD) instrument.The results show that Nb does not significantly improve the recrystallization texture;however,it promotes the formation of TiN,TiC and TiS and increases the number and size of TiN precipitate by increasing the effective solid solubility of Ti in the matrix;as a good grain refiner,Nb inhibits grain growth during coiling and recrystallization annealing;the addition of Nb tends to coarsen the carbonitride precipitates and reduce the volume fraction of the {111}<110> texture component in the γ fiber.
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Key words:
- Ti-IF steel /
- Nb+Ti-IF steel /
- microstructure /
- precipitate /
- texture
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