Abrasion-Resistant White Cast Iron 21
-ASTM A532_A532M
- C. Effects of modification on grain boundary metallurgical quality of high chromium white cast iron
First of all there are many factors that affect the grain boundary metallurgical quality of high chromium white cast iron. Furthermore the content and morphology of inclusions seems like the most influential factors. The analysis results show that the main inclusions are sulfide and oxide or silicate. Which are in the grain boundary of high chromium white cast iron. In addition sulfide and oxide are most sensitive to the mechanical properties. Furthermore it is not difficult to see from table 11 that SI and S III modifiers significantly reduce oxygen and sulfur content. Thus seems like significantly reducing the grain boundary inclusions.
Especially relevant in table 12 shows the effect of different modifiers on impact value and probably small energy impact value also.
Table 12 Effect of different modifiers on impact value and small energy impact value
| Batch No. | Chemical composition % | Modifier type | Impact value
αk / J. ·cm – 2 |
Small energy multiple shocks / times
(impact power is 117J) |
Grinding ball
Test / times |
Hardness
HRC |
|||||
| C | S | Si | Mn | Cr | Cu | ||||||
| 0-1 | 2.49 | 0.047 | 0.85 | 1.55 | 15.6 | – | Fe – Mg – Ba – Ca | 7.08, 8.75 | — | — | 56 |
| 1-1 | 2.75 | 0.047 | 1.18 | 1.47 | 15.5 | – | 7.9 , 7 , 7.9 | — | — | 57 | |
| 2-1 | 2.61 | 0.048 | 0.83 | 1.55 | 16.3 | 0.73 | SiC | 7.2 , 5.6 | — | — | 57 |
| 2-2 | 2.52 | 0.048 | 0.91 | 0.39 | 10.9 | 0.32 | 8.5 , 8 | — | — | 56 | |
| 2-3 | 2.49 | 0.047 | 0.85 | 1.55 | 15.6 | 0.53 | 9 , 10.5 | — | — | 56 | |
| 3-1 | 2.49 | 0.047 | 0.85 | 1.55 | 15.6 | – | SI | — | — | — | 56 |
| 3-2 | 2.49 | 0.047 | 0.85 | 1.55 | 15.6 | – | 11.4, 12.4 | — | — | 56 | |
| 3-3 | 2.49 | 0.047 | 0.85 | 1.55 | 15.6 | 0.71 | 9.5 ,12.6 ,12.3 | — | — | 56 | |
| 3-4 | 2.49 | 0.047 | 0.85 | 1.55 | 15.6 | 0.32 | 12.2, 13.2 | — | — | 56 | |
| 3-5 | 2.49 | 0.047 | 0.85 | 1.55 | 15.6 | 0.51 | 11.5, 9.5, 13.2 | 34100 | 3250 | 56 | |
| 4-1 | 2.49 | 0.047 | 0.85 | 1.55 | 15.6 | – | S Ⅲ | 8.3 , 10 , 10 | — | — | 56 |
| 4-2 | 2.49 | 0.047 | 0.85 | 1.55 | 15.6 | 0.71 | — | — | — | 56 | |
| 4-3 | 2.49 | 0.047 | 0.85 | 1.55 | 15.6 | 0.32 | 10.6 , 9.6 | — | — | 56 | |
| 4-4 | 2.49 | 0.047 | 0.85 | 1.55 | 15.6 | 0.57 | 11 , 10.4 | — | — | 56 | |
| 4-5 | 2.49 | 0.047 | 0.85 | 1.55 | 15.6 | 0.53 | 11 , 12.4 | — | — | 56 | |
| 5-1 | 2.49 | 0.047 | 0.85 | 1.55 | 15.6 | 0.51 | Molten iron | 5.3 , 6.3 | 20500 | 1350 | 56 |
| 5-2 | 2.49 | 0.047 | 0.85 | 1.55 | 15.6 | 0.53 | 5.4 , 5.7 | 56 | |||
