利用TEM和EDX技术, 研究了2.25Cr-1Mo-0.25V钢焊缝中第二相在700 ℃下保温一系列时间段的转变. 结果表明, 焊后空冷焊缝中的第二相为M3C, 回火过程中第二相主要组成为M3C+M7C3+M23C6. 长时间回火后M3C发生球化并消失, 初期析出的低wCr/wFe(Cr与Fe的质量比)的M7C3是亚稳相, M23C6只能在较低的回火参数范围内存在, 后期形成了wCrwFe更高的M7C3稳定的第二相. M3C多呈球状,M7C3和M23C6多为长条状和块状.
The evolution of the second phase in 2.25Cr–1Mo–0.25V steel weld metal during holding at 700 ℃ for a series of durations was studied by TEM and EDX. The precipitates in the as– welded specimen are M3C carbides, and during tempering M7C3 and M23C6 carbides appeared. After long term tempering M3C carbides spheroidized and disappeared. In the early tempering stage M7C3 carbide with low wCr/wFe is metastable phase. M23C6 carbide can exist only under low tempering parameter, and M7C3 carbide with high wCr/wFe formed in the late stage is the stable phase. M3C carbides are often sphere–liked, M7C3 and M23C6 carbides are rod–shaped and lump–shaped.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] | |
| [12] | |
| [13] | |
| [14] | |
| [15] | |
| [16] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%