Competitive precipitation law of nitrides during continuous casting cooling process of boron-containing steel
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摘要: 含硼钢连铸冷却过程中BN析出不仅会减少钢中有效硼含量，削弱硼合金化的有益效果，而且还会导致铸坯裂纹敏感性增强。探明氮化物的竞争析出规律对含硼钢连铸冷却过程BN析出相的精准调控具有重要的意义。针对含硼钢连铸冷却过程，通过热力学计算研究了BN、TiN、AlN间的竞争析出行为，并探究了钢中Ti、Al、N含量对BN析出抑制效果的影响规律。结果表明，随着钢中Ti、Al含量增高，TiN、AlN析出时机提前，增大到一定程度时TiN、AlN会先于BN析出，从而抑制BN析出；进一步提高钢中Ti、Al含量，最终使得BN完全不析出；相较于Al元素，通过调节钢中Ti元素含量来调控BN析出行为更为经济可靠；抑制BN完全不析出的临界钛添加量与钢中硼、氮元素含量的关系式为：${w_{{\text{Ti(no BN)}}}} = \left( {3.3{w_{\text{N}}} + 3.22} \right){w_{\text{B}}} + 3.36{w_{\text{N}}}$，临界钛添加量$ {w_{{\text{Ti(no BN)}}}} $随钢中氮、硼元素含量的增大而增大。研究结果为含硼钢成分设计和连铸坯质量控制提供了重要的理论依据。Abstract: During continuous casting cooling process of boron-containing steel, the precipitation of BN not only reduces the effective boron content, weakening the beneficial effects of boron alloying, but also increases the crack sensitivity of the as-cast billet. Clarifying the competitive precipitation law of nitrides is crucial for precise control of BN precipitation during the continuous casting cooling process of boron containing steel. This study focuses on the continuous casting cooling process of boron containing steel, and investigates the competitive precipitation behavior among BN, TiN, and AlN through thermodynamic calculations. The influence of Ti, Al, and N content in steel on the suppression effect of BN precipitation is also explored. The results indicate that as the content of Ti and Al in steel increases, the timing of TiN and AlN precipitation advances. When the content reaches a certain level, TiN and AlN precipitate before BN, thereby inhibiting BN precipitation. Further increasing Ti and Al content in the steel ultimately prevents the precipitation of BN completely. Compared to Al element, regulating the precipitation behavior of BN by adjusting Ti content in steel is more economical and reliable. The critical Ti addition that completely suppress BN precipitation follows the relationship :${w_{{\text{Ti(no BN)}}}} = \left( {3.3{w_{\text{N}}} + 3.22} \right) $$ {w_{\text{B}}} + 3.36{w_{\text{N}}}$, where the critical Ti addition $ {w_{{\text{Ti(no BN)}}}} $increases with higher nitrogen and boron content in the steel. The results provide an important theoretical basis for the compositional design of boron-containing steel and quality control of continuous casting billets.
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图 1 BN、TiN、AlN在奥氏体中的固溶度对比
Figure 1. Comparison of solid solubility of BN, TiN and AlN in austenite
图 2 TiN 优先于BN析出的临界钛添加量
Figure 2. Critical Ti addition for preferential precipitation of TiN over BN
图 3 各温度下BN不析出的临界Ti含量
Figure 3. Critical Ti content for complete suppression of BN precipitation at various temperatures
图 4 AlN 优先于BN析出的临界钛添加量
Figure 4. The critical aluminum addition required for preferential precipitation of AlN over BN
图 5 各温度下BN不析出的临界Al含量
Figure 5. Critical Al content for complete suppression of BN precipitation at various temperatures
图 6 铸坯中不析出BN的临界Ti添加量
(a) 氮含量对$ {w_{{\text{Ti(no BN)}}}} $的影响; (b) 氮含量对(a)中直线斜率和截距的影响
Figure 6. Critical Ti addition amount to completely suppress BN precipitation in the as-cast billet
图 7 铸坯中不析出BN的临界Al添加量
(a) 氮含量对$ {w_{{\text{Al(no BN)}}}} $的影响; (b) 氮含量对(a)中直线斜率和截距的影响
Figure 7. Critical Al addition amount to completely suppress BN precipitation in the as-cast billet
图 8 22MnB5钢中第二相的表征结果
Figure 8. Characterization results of second phases in 22MnB5 steel
(a)Ti(N,C)；(b) Cu2S；(c) TiC；(d) Al2O3；(e) MnS；(f) TiN
表 1 22MnB5钢的主要化学成分
Table 1. Main chemical compositions of 22MnB5 steel
% 试样 C Si Mn P S Cr Al Ti B N Ⅰ 0.21 0.27 1.18 0.008 0.001 0.23 0.0298 0.033 0.0027 0.0028 Ⅱ 0.23 0.034 1.47 0.010 0.003 0.18 0.0400 0.040 0.0020 0.0030 
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