Precipitation behavior of Ti(C,N) in CSP low carbon steel with small amount of Ti addition
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摘要: 通過實驗觀察及熱力學計算,研究了CSP低碳微Ti鋼中的Ti(C,N)析出.實驗觀察到大量15~30nm的Ti(C,N)第二相粒子,它們在鑄坯均熱保溫和前兩道次的熱軋中析出并長大充分;均熱前CSP鑄坯中只有很少量尺寸約大于50nm的TiN粒子析出,鑄坯中觀察不到微米級的大塊TiN夾雜.研究結果表明,CSP工藝下粒子析出行為同傳統工藝相比發生了變化,所以微量Ti在鋼中的作用也有很大不同.Abstract: The precipitation behavior of Ti(C,N) particles in CSP low carbon steel with Ti addition was studied by experimental observation and thermodynamic calculation. Large amount of fine Ti(C,N) particles with 15-30 nm in size were observed, which were precipitated and grew up during the soaking and in the first two hot rolling process. There were only a few TiN particles of more than 50 nm in size precipitated in the slabs before soaking, and no TiN inclusions larger than 1 μm were observed. The results show that the precipitation behavior in the steel produced by the CSP technology is different from that in the conventional one. The effects of small amount of Ti addition on the properties of steels are also different.
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Key words:
- CSP /
- precipitation /
- austenite recrystallization /
- grain refinement
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