Introduction
Experimental
Parameters | Company A (Heat 1) | Company B (Heat 2) |
---|---|---|
Mold sinusoidal mode (f) | 176 cycle/min | 95 cycle/min |
Stroke (s) | ±2 mm | ±2.9 mm |
Casting speed (v) | 0.8 m/min | 0.78 m/min |
Heat | C | Si | Mn | Cr | Ni | Mo |
---|---|---|---|---|---|---|
1 | 0.231 | 0.30 | 0.67 | 1.28 | 2.88 | 0.24 |
2 | 0.16 | 0.43 | 1.52 | — | — | — |
Model Description
Thermal Model
Symbol | Value | Description |
---|---|---|
T
liq
| 1773 K (1499.85 °C) | liquidus temperature |
T
sol
| 1713 K (1439.85 °C) | solidus temperature |
T
p
| 1766 K (1492.85 °C) | peritectic temperature |
T
f
| 1746 K (1472.85 °C) | end of peritectic transformation |
k
| 33 W/m K | thermal conductivity |
C
p
| 700 J/kg K | specific heat |
ΔH
f
| 262 kJ/kg | heat of fusion |
ρ
δ
| 7876 kg/m3
| ferrite density |
ρ
γ
| 8100 kg/m3
| austenite density |
T
00
| 298.15 K (25 °C) | ambient temperature |
Mechanical Model
Results
Experimental Results
Segregated Cracks (Heat 1)
Area | Si | Mn | C | Mo | Ni | Cr |
---|---|---|---|---|---|---|
A1 | 0.36 | 0.97 | 0.20 | 0.32 | 2.81 | 1.45 |
A2 | 0.36 | 0.70 | 0.20 | 0.29 | 2.79 | 1.41 |
A3 | 0.37 | 1.00 | 0.31 | 0.36 | 2.78 | 1.48 |
A4 | 0.37 | 0.78 | 0.27 | 0.34 | 2.80 | 1.46 |
A5 | 0.36 | 0.75 | 0.29 | 0.32 | 2.81 | 1.42 |
Average (\( \bar{C} \)), wt pct | 0.36 | 0.84 | 0.25 | 0.33 | 2.80 | 1.44 |
Nominal (\( C_{0} \)), wt pct | 0.30 | 0.67 | 0.23 | 0.24 | 2.88 | 1.28 |
Area | Si | Mn | C | Mo | Ni | Cr |
---|---|---|---|---|---|---|
A6 | 0.37 | 0.83 | 0.25 | 0.45 | 2.69 | 1.73 |
A7 | 0.35 | 0.72 | 0.20 | 0.35 | 2.71 | 1.51 |
A8 | 0.36 | 0.71 | 0.21 | 0.32 | 2.72 | 1.50 |
Average (\( \bar{C} \)), wt pct | 0.36 | 0.75 | 0.22 | 0.37 | 2.71 | 1.58 |
Nominal (\( C_{0} \)), wt pct | 0.30 | 0.67 | 0.23 | 0.24 | 2.88 | 1.28 |
\( S = {\raise0.7ex\hbox{${\bar{C}}$} \!\mathord{\left/ {\vphantom {{\bar{C}} {C_{0} }}}\right.\kern-0pt} \!\lower0.7ex\hbox{${C_{0} }$}} \)
| 1.20 | 1.12 | 0.95 | 1.56 | 0.94 | 1.23 |
Elemental Mapping
Non-segregated Cracks (Heat 1)
Surface Oxidation and Non-segregated Cracks (Heat 2)
Point | O (At. Pct) | Si (At. Pct) |
---|---|---|
a | — | 0.7 |
b | 10.4 | 1.5 |
c | 12.8 | 2.0 |
d | 12.9 | 2.1 |
e | 13.5 | 2.5 |
Point | C | O | Na | Al | Si | Ca | Mn | Fe |
---|---|---|---|---|---|---|---|---|
1 | 5.3 | 31.8 | — | — | 1.8 | — | 3.2 | 57.8 |
2 | 5.8 | 15.5 | — | — | 4.4 | — | 2.0 | 72.3 |
3 | 5.6 | 15.1 | — | — | 4.4 | — | 1.8 | 73.1 |
4 | 5.5 | 19.5 | — | — | 5.7 | — | 3.0 | 66.3 |
5 | 5.6 | 20.5 | — | — | 5.5 | — | 2.9 | 65.6 |
6 | 6.0 | 23.1 | — | — | 6.2 | — | 3.5 | 61.2 |
7 | 2.5 | 46.1 | 1.8 | 1.5 | 13.6 | 3.0 | 3.3 | 28.2 |