Based on these experiments , it may be claimed that there is segregation of sn to grain boundaries in 0 . 15 % c steel during cooling from a high solution treatment temperature . this segregation reduces grain boundary cohesion , which results in low hot ductility and intergranular fracture 通过试验和计算得出: sn在0 . 1swt . % c钢中发生非平衡晶界偏聚的临界时间为1245左右,临界冷却速率大约为8 / s ,与试验结果基本一致。