| 1. | Addition of sn deteriorates the hot ductility , deepens the ductility trough , and shifts the ductility region to higher temperatures
Sn的存在恶化了钢的热塑性，导致第类塑性谷底加深，塑性凹槽上限向高温扩展。 |
| 2. | In the third ductility region , the reduction in area of the sn - undoped steel is larger than that of the sn - doped steel . this means that the hot ductility of the sn - undoped steel is better than that of the sn - doped steel
在第类脆性温度区内，不含sn钢的断面收缩率大于含sn钢的断面收缩率，即不含sn钢的热塑性要比含sn钢的热塑性好。 |
| 3. | The results of auger electron spectroscopy indicate that sn segregation occurs during continuous cooling and the degrees of segregation are different for different cooling rates . at a cooling rate of 10 / s , the maximum sn segregation and the worst hot ductility occur
俄歇能谱表明， sn不仅在连续冷却过程中发生了晶界偏聚，而且sn的晶界偏聚量随着连续冷却速率的变化而变化。 |
| 4. | 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。 |
| 5. | The segregation mechanism of tramp element sn during continuous cooling and isothermal aging and its influence on the hot ductility of low carbon steel are discussed and the brittleness during continuous casting of the sn - doped low carbon steel is forecasted . at a strain rate of 10 - 2s - 1 and a cooling rate of 10 / s , there exists a third ductility trough for both steels at 750
在应变速率和冷却速率分别为10 ~ ( - 2 ) s和10 s的条件下进行热模拟拉伸时，两种试验钢均在750时出现由先共析铁素体沿奥氏体晶界呈薄膜网状析出所引起的第类脆性谷底。 |
| 6. | Based on the hot tensile test results , there exists a cooling rate at which a minimum reduction in area occurs and the hot ductility of the sn - doped steel is worse than that of the sn - undoped steel . when the cooling rate is lower or higher than 10 / s , the hot ductility is increased
连续冷却到750 800范围内拉伸时，存在一个冷却速率( 10 s ) ，以这个冷却速率进行冷却，试样的断面收缩率最小，热塑性最差；当冷却速率大于或者小于这个冷却速率时，试样的断面收缩率均会增大，热塑性增强。 |
