Effect of soaking time on the dissolution of microalloyed elements in high-strength steel containing Ti and Nb
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摘要: 采用相分析和X射線衍射技術,研究了含Ti、Nb等微合金元素的高強鋼中碳氮化物的溶解行為.結果表明,加熱到1250℃,未均熱時,主要是面心立方結構的Ti(CN)、(TiNb)(CN)、TiC析出相;均熱時間為45min,部分Ti和Nb繼續溶解,析出相轉為Ti(CN)、TiC為主,平均顆粒尺寸由300nm增大為323nm,此時Ti、Nb固溶已經達到平衡,固溶率分別為64.2%和85.8%.當保溫80min時,析出相含量基本沒有變化,但顆粒尺寸有所增加.Abstract: Dissolution of carbonitride in high-strength steel containing Ti and Nb was investigated by means of phase analysis and X-ray diffraction. The results show that the precipitation phases are fcc Ti(CN), (TiNb) (CN) and TiC when heated to 1250℃ without soaking; but mainly Ti(CN) and TiC when heated to 1250℃ and preserved for 45 min, their size increased from 300 nm to 323 nm, and the dissolution rates of Ti and Nb were 64.2% and 85.8% respectively. The content of precipitates extracted from the sample soaked for 80 min was almost the same with that for 45 min, whereas the particle size increased. It indicated that the dissolution process was apparently approaching thermodynamic equilibrium.
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Key words:
- high-strength steel /
- carbonitride /
- soaking time /
- precipitation phase /
- X-ray diffraction analysis
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