利用Gleeble3800热模拟实验机研究了1Cr18Ni9Ti奥氏体不锈钢从糊状区以不同速率冷却到不同温度时的高温力学性能。研究表明，零强度温度（Zero Strength Temperature）和零塑性温度（Zero Ductility Temperature）的温差小于20 ℃，大的冷却速率可以改善1Cr18Ni9Ti不锈钢在1300 ℃以上时的热塑性。凝固收缩和金属液的补缩作用对1Cr18Ni9Ti钢的高温力学性能有很大影响，随着固相率的升高，材料在拉伸破坏时由沿晶断裂转变为穿晶断裂方式。
With Gleeble3800 thermal simulation testing machine, the effect of cooling rate of specimens cooled from the temperature of mushy zone on high temperature mechanical properties of 1Cr18Ni9Ti was investigated. The experimental results showed that the interval between zero strength temperature (ZST) and zero ductility temperature(ZDT) is less than 20 ℃,and the hot ductility at 1300 ℃ could be improved by increasing cooling rate. It is deemed that this change can be attributed to the combined effect of solidification shrinkage and feeding of remained melts. With the increase of the solid fraction, the fracture is changed from the intergranular to transgranular.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%