【摘要】 <正> 钢的连铸生产中,最严重的质量问题之一是裂纹,它是钢的凝固壳在连铸过程中受到各种应力的作用而发生变形、在塑性薄弱的地方产生的。人们对连铸裂纹的形成进行了大量的研究,发现钢在连铸温度范围内的力学行为(热塑性和热强度)是影响裂纹形成的最主要因素之一。因此,研究钢在连铸温度范围内的力学行为,对于制定合理的连铸工艺、防止裂纹的产生及提高铸坯成品率都有重要的意义。 1 实验方法试验材料是在实验室的真空感应电炉上熔炼的,先铸成钢锭,然后把钢锭热锻成φ13mm更多还原

【Abstract】 Hot ductility of low carbon steel under continuosly casting simu-lation conditions was studied by using in-situ melted and solidified method on a Gleeble-1500 thermal simulator. there exsit two low ductility troughs in the hot ductility versus testing temperature curve of low carbon steel: Tm～1300℃(Ⅰ)and1000～700℃(Ⅱ). The embrittlement in the I region is due to the existence of the segregating elements and inclusions in the interdendritic regions, which is of interdendritic failure. The embrittlement in the Ⅱ region is due to the interdendritic segregation and sulphige precipitates distributed along austenite grain boundaries, which is of interdendritic failure and inte-rgranular failure related to microvoid coalescence.更多还原