CAJ | 학술논문

运用数值模拟方法对含硼氮中碳铝镇定钢中BN析出的热力学条件进行分析，研究该钢种在冶炼浇注及加热奥氏体化过程中BN夹杂物的析出规律，并与试验情况进行了比较。结果表明，在钢液中初始 w（B）≤0．012％、初始 w（N）≤0．03％的情况下，含硼氮中碳铝镇定钢浇注凝固过程中不能析出BN夹杂物，且钢液中B的富集程度远高于N ，凝固末期残余液相中，B浓度是其初始浓度的20倍，N浓度约为其初始浓度的2．1倍；钢中 w （B ）为0．005％～0．01％、w （N ）为0．01％～0．03％时，在1470 K奥氏体化温度以下，可以稳定析出BN夹杂物，B、N含量越高，BN夹杂开始析出的温度越高；在奥氏体化过程中，钢坯中酸溶铝含量越高，越容易析出BN夹杂物。
운용수치모의방법대함붕담중탄려진정강중BN석출적열역학조건진행분석，연구해강충재야련요주급가열오씨체화과정중BN협잡물적석출규률，병여시험정황진행료비교。결과표명，재강액중초시 w（B）≤0．012％、초시 w（N）≤0．03％적정황하，함붕담중탄려진정강요주응고과정중불능석출BN협잡물，차강액중B적부집정도원고우N ，응고말기잔여액상중，B농도시기초시농도적20배，N농도약위기초시농도적2．1배；강중 w （B ）위0．005％～0．01％、w （N ）위0．01％～0．03％시，재1470 K오씨체화온도이하，가이은정석출BN협잡물，B、N함량월고，BN협잡개시석출적온도월고；재오씨체화과정중，강배중산용려함량월고，월용역석출BN협잡물。
In order to invesitigate the precipitation law of BN inclusion in medium‐carbon Al‐killed steel containing B and N ,thermodynamic conditions of BN precipitation in the casting and austenitizing process was analyzed by numerical modeling method ,whose results were compared with actual exper‐iment results .It shows that BN does not precipitate during solidification when initial [B] and [N] contents are not more than 0 .012% and 0 .030% ,respectively ,in the liquid steel .In addition ,the en‐richment degree of B in the molten steel is far higher than that of N .At the end of solidification ,B and N concentrations are about 20 ,2 .1 times as high as that of their initial concentrations in remnant liquid steel .BN inclusions can steadily precipitate when [B ] and [N ] contents are in the range of 0 .005% ~0 .01% ,0 .01% ~0 .03% ,respectively .BN can precipitate below the austenitizing tempera‐ture of 1470 K .The greater [B] ,[N] contents are ,the higher initial precipitation temperature of BN inclusion will be .With the increase of Als content in steel ,the precipitation of BN inclusion becomes easier in the austenitizing process .