论文部分内容阅读
通过热力学计算与SEM-EDS检测对酒钢BOFLFRHCSP工艺Ti-IF钢夹杂物形核的热力学进行了研究。结果表明,在Ti-IF钢中夹杂物形核主要是非均匀形核,最易形成TiN,其次为CaO,然后为Al_2O_3。温度升高有利于Al_2O_3、CaO的形成;TiN的形成受温度影响较小。Ti-IF钢中w([Als])控制为0.027%~0.055%时,w([Mg])只需大于0.000 015%,就会有镁铝尖晶石MgO·Al_2O_3(MA)析出。Ti-IF钢中夹杂物演变主要有3种途径,分别为尖晶石与硅酸钙的复合夹杂Al_2O_3→MA→MgAlCaSi、低熔点的铝酸钙夹杂Al_2O_3→CaO·6Al_2O_3(CA_6)→CaO·2Al_2O_3(CA_2)→CaO·Al_2O_3(CA)→3CaO·Al_2O_3(C_3A)/12CaO·7Al_2O_3(C_(12)A_7)以及钛的复合物或钛的化合物Al_2O_3→TiOx→Al_2O_3·TiOx和Ti→TiN/Ti(C,N)。
Thermodynamics calculation and SEM-EDS test were used to study the thermodynamics of inclusion nucleation of Ti-IF steel in BOF LFRHCSP process. The results show that the nucleation of inclusions in Ti-IF steel is mainly non-uniform nucleation, most likely to form TiN, followed by CaO, then Al 2 O 3. The increase of temperature is beneficial to the formation of Al 2 O 3 and CaO. The formation of TiN is less affected by the temperature. When w ([Als]) is controlled from 0.027% to 0.055% in Ti-IF steels, only MgO-Al 2 O 3 (MA) precipitates when w ([Mg] There are mainly three kinds of inclusions evolution in Ti-IF steels: Al 2 O 3 → MA → MgAlCaSi, low-melting calcium aluminate inclusions Al 2 O 3 → CaO · 6Al 2 O 3 (CA 6) → CaO · (CA_2) → CaO · Al_2O_3 (CA) → 3CaO · Al_2O_3 (C_3A) / 12CaO · 7Al_2O_3 (C_ (12) A_7) and titanium compounds or titanium compounds Al_2O_3 → TiOx → Al_2O_3 · TiOx and Ti → TiN / Ti (C, N).