利用扫描电镜研究了中碳NiCrMo钢过热断口(石状断口)的微观形态。观察结果表明,过热的石状断口为沿晶塑坑断裂。过热断口上的MnS夹杂的形态及大小变化很大,在同一个石状颗粒的各个表面上可以表现大不相同。在断口上有时直接观察到MnS夹杂的魏氏析出特征,即硫化物夹杂以极为弥散的形式均匀地析出在高温奥氏体的{100}晶面上。对各种形态的硫化物夹杂可能的形成原因及其控制因素进行了讨论。
Fractographic examination of an overheated-medium carbon NiCrMo steel hasbeen carried out by SEM. The rock-salt fracture occurred at the original austeniticgrain boundaries of the steel showed dimples, and the morphology and size ofMnS inclusions located in such dimples varied with different facets even for asingle austenite grain. The Widmannstatten precipitates of sulphide also occurredat the rock-salt fracture surfaces at times. The probable cause and the controllingfactors in regard to the formation of sulphide inclusions in various morphologieshave been discussed.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%