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 通過試驗(yàn)和計(jì)算得出: sn在0 . 1swt . % c鋼中發(fā)生非平衡晶界偏聚的臨界時(shí)間為1245左右,臨界冷卻速率大約為8 / s ,與試驗(yàn)結(jié)果基本一致。