采用热力学相计算、光学显微镜、扫描电镜、透射电镜及化学相分析等手段研究了一种新 型变形高温合金标准热处理状态的基本组织, 并通过与Waspaloy合金组织的对比, 揭示了这种 合金既具有较高的高温蠕变强度, 又具有良好的加工性能的内在原因. 结果表明, 标准热处理状 态的实验合金由大小不均匀的等轴晶组成, 平均晶粒尺寸约为80 μm. 合金中除基体γ外, 晶界和 晶内还分布着颗粒状的Cr23C3和少量(Ti, Mo)C相; γ'强化相弥散分布于基体中, 其平均尺寸约 为25 nm, 质量分数为16.9 %. 适当增大固溶强化元素Mo的含量, 减少γ'形成元素Al或Ti的含量, 可得到既具有较高蠕变强度又具有良好加工性能的镍基变形高温合金.
The microstructure of a new wrought superalloy under standard heat treatment condition was studied by means of thermodynamic calculation, optical microscope, scanning electron microscopy, transmission electron microscopy and chemical phase analysis. The main mechanical properties were given for comprehensively understanding the tested alloy. The results indicate that the tested alloy under standard heat treatment condition is composed of equiaxed grains with different sizes. The spheric γ′(Ni3（Al，Ti）) is the main strengthening phase of the alloy and distribute dispersedly in the matrix whose size is very small.Cr23C6 and a few （Ti，Mo）C mainly precipitate on the grain boundaries and some of them precipitate in intracrystalline. Besides, There are very few M6C in the tested alloy. The tested alloy under standard heat treatment condition not only has higher strength but has better plasticity and ductility, has higher creep strength than that of Waspaloy alloy.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%