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利用俄歇电子能谱仪对硼微合金化钢解理断面及延性沿晶断面进行了分析,发现硼在晶界有超过300倍的极强偏聚能力,偏聚量高的地方硼的原子百分数可达38.65%。热力学分析可知,BN析出温度高,优先析出可抑制Al N析出。利用扫描电镜对常温态硼微合金化钢铸坯试样观察,发现BN仅从铁素体析出,晶界和晶内均有尺寸在2~5μm的析出物;经高温加热淬火,发现BN多与Mn S形成复合析出物,并且BN以Mn S为核心进行形核长大。
Using Auger electron spectroscopy analysis of boron micro-alloyed steel cleavage section and ductile crystal along the fracture surface was found in the grain boundary boron has strong segregation capacity of more than 300 times the high amount of segregation of boron atoms Percentage up to 38.65%. Thermodynamic analysis shows that BN precipitation temperature is high, preferential precipitation can inhibit Al N precipitation. Scanning electron microscopy was used to observe the samples of the as-cast boron microalloyed steel slab at room temperature. It was found that BN precipitated only from ferrite, and precipitates with grain sizes of 2 ~ 5μm were present in both grain boundaries and grains. After high-temperature quenching, Forms complex precipitates with Mn S, and nucleates and grows with Mn S as a nucleus.