本文在Gleeble——1500动态热-力模拟实验机上,采用凝固法和加热法,对0.11%C钢在凝固后的高温力学性能进行了研究。发现两种方法获得的结果有很大差异,确认凝固法研究钢的液态模锻过程产生的热裂纹,与实际更接近。结果表明,0.11%C钢在凝固后至900℃的冷却过程中存在两个脆性区,即凝固结束后到1450℃和1000～1250℃。它们分别和钢在凝固点下凝固组织脆性或奥氏体晶界析出大量细小夹杂物而造成晶界脆性有关。 In this paper, on the Gleeble - 1500 dynamic thermo - force simulator, the mechanical properties of 0.11% C steel after solidification at high temperature were studied by solidification and heating methods. It is found that the results obtained by the two methods are quite different. It is confirmed that the hot cracking caused by the liquid die forging process of the solidification method is closer to the actual one. The results show that there are two brittle zones in 0.11% C steel after cooling to 900 ℃, that is, 1450 ℃ and 1000 ~ 1250 ℃ after solidification. They are respectively related to the brittleness of the grain boundary caused by the brittleness of the solidified structure of the steel at the freezing point or the precipitation of a large number of small inclusions in the grain boundary of austenite.