Introduction
Experimental
Heat no. | Vermicularizing agent, wt.% | Fe-Ti, wt.% |
---|---|---|
I | 0.5 | … |
II | 0.5 | 0.15 |
III | 0.7 | 0.20 |
IV | 0.7 | 0.40 |
Heat no. | C, wt.% | Si, wt.% | Mn, wt.% | P, wt.% | S, wt.% | Cr, wt.% | Ni, wt.% | Cu, wt.% | V, wt.% | Al, wt.% | Ti, wt.% | Mg, wt.% |
---|---|---|---|---|---|---|---|---|---|---|---|---|
I | 3.63 | 2.47 | 0.03 | 0.026 | 0.017 | 0.03 | 0.004 | 0.045 | 0.007 | 0.010 | 0.009 | 0.010 |
II | 3.66 | 2.55 | 0.04 | 0.027 | 0.020 | 0.03 | 0.005 | 0.044 | 0.011 | 0.010 | 0.070 | 0.005 |
III | 3.65 | 2.53 | 0.05 | 0.030 | 0.010 | 0.03 | 0.030 | 0.010 | 0.010 | 0.010 | 0.095 | 0.020 |
IV | 3.60 | 2.55 | 0.05 | 0.023 | 0.018 | 0.04 | 0.040 | 0.060 | 0.010 | 0.021 | 0.133 | 0.021 |
Experimental Results and Analysis
Analysis of Microstructure
Heat no. | Graphite nodule fraction, % | Ferrite fraction, % | TiC, % | ||||
---|---|---|---|---|---|---|---|
G = 3 mm |
G = 5 mm |
G = 13 mm |
G = 3 mm |
G = 5 mm |
G = 13 mm | ||
I | 73 | 47 | 20 | 40 | 65 | 90 | Absence |
II | Absence | Absence | Absence | 15 | 85 | 90 | <1 |
III | 46 | 29 | 17 | 40 | 74 | 85 | <1 |
IV | 34 | 17 | 15 | 30 | 56 | 90 | <1 |