Acta Metallurgica Sinica (English Letters) ›› 2016, Vol. 29 ›› Issue (7): 638-646.DOI: 10.1007/s40195-016-0434-x
• Orginal Article • Previous Articles Next Articles
Choongdo Lee1(), Taeil So2, Kwangseon Shin2
Received:
2016-01-08
Revised:
2016-04-18
Online:
2016-07-10
Published:
2016-07-10
Choongdo Lee, Taeil So, Kwangseon Shin. Effect of Gas Bubbling Filtration Treatment on Microporosity Variation in A356 Aluminium Alloy[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(7): 638-646.
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Si | Mg | Mn | Cu | Fe | Ti | Sr | Al |
---|---|---|---|---|---|---|---|
7.3 | 0.33 | 0.055 | 0.09 | 0.291 | 0.053 | 0.02 | Bal. |
Table 1 Chemical composition of A356 aluminium alloys
Si | Mg | Mn | Cu | Fe | Ti | Sr | Al |
---|---|---|---|---|---|---|---|
7.3 | 0.33 | 0.055 | 0.09 | 0.291 | 0.053 | 0.02 | Bal. |
Aperture/GBF time | Grain size (μm) | SDAS (μm) | Eutectic Si particles | ||||||
---|---|---|---|---|---|---|---|---|---|
Area fraction (%) | Circularity | Aspect ratio | |||||||
No GBF | 225.3 | 41.1 | 18.4 | 0.92 | 1.93 | ||||
2 mm diameter | 5 min | 196.1 | 37.4 | 18.3 | 0.76 | 2.19 | |||
10 min | 193.8 | 31.3 | 17.6 | 0.74 | 2.21 | ||||
15 min | 185.2 | 23.2 | 16.3 | 0.73 | 2.28 | ||||
1 mm diameter | 5 min | 194.5 | 34.6 | 18.3 | 0.75 | 2.09 | |||
10 min | 185.6 | 29.6 | 18.1 | 0.74 | 2.21 | ||||
15 min | 178.6 | 20.3 | 16.9 | 0.73 | 2.17 |
Table 2 Typical values for microstructural change on GBF treatment
Aperture/GBF time | Grain size (μm) | SDAS (μm) | Eutectic Si particles | ||||||
---|---|---|---|---|---|---|---|---|---|
Area fraction (%) | Circularity | Aspect ratio | |||||||
No GBF | 225.3 | 41.1 | 18.4 | 0.92 | 1.93 | ||||
2 mm diameter | 5 min | 196.1 | 37.4 | 18.3 | 0.76 | 2.19 | |||
10 min | 193.8 | 31.3 | 17.6 | 0.74 | 2.21 | ||||
15 min | 185.2 | 23.2 | 16.3 | 0.73 | 2.28 | ||||
1 mm diameter | 5 min | 194.5 | 34.6 | 18.3 | 0.75 | 2.09 | |||
10 min | 185.6 | 29.6 | 18.1 | 0.74 | 2.21 | ||||
15 min | 178.6 | 20.3 | 16.9 | 0.73 | 2.17 |
Fig. 6 Variation of tensile strength and elongation with the degassing time under difference aperture sizes of the gas inlet of 1 mm diameter a and 2 mm diameter b
Fig. 7 SEM images of the fractured specimens; no GBF a, high magnification b, c for A- and B-positions in a, 10-min GBF treatment with impeller of 2-mm-dia. aperture d and spectral results e, f of EDS analysis for A- and B-positions in a
Treatment | Defect susceptibility | Maximum values achievable in defect-free condition (f = 0) | Strain-hardening exponent | ||
---|---|---|---|---|---|
UTS | Elongation | UTS (MPa) | Elongation (%) | ||
No GBF | 1.03 | 5.27 | 190.2 | 3.7 | 0.23 |
10 min (2 mm diameter) | 0.42 | 3.72 | 209.8 | 5.1 | 0.26 |
5 min (1 mm diameter) | 0.43 | 2.38 | 212.3 | 5.1 | 0.25 |
Table 3 Defect susceptibility of the tensile properties to microporosity variation and maximum values of the tensile properties achievable under defect-free conditions
Treatment | Defect susceptibility | Maximum values achievable in defect-free condition (f = 0) | Strain-hardening exponent | ||
---|---|---|---|---|---|
UTS | Elongation | UTS (MPa) | Elongation (%) | ||
No GBF | 1.03 | 5.27 | 190.2 | 3.7 | 0.23 |
10 min (2 mm diameter) | 0.42 | 3.72 | 209.8 | 5.1 | 0.26 |
5 min (1 mm diameter) | 0.43 | 2.38 | 212.3 | 5.1 | 0.25 |
Treatment | Si | Mg | Fe | Ni | Cr | Al |
---|---|---|---|---|---|---|
No GBF | 7.31 | 0.33 | 0.291 | 0.042 | 0.026 | Bal. |
15-min GBF | 7.25 | 0.43 | 1.08 | 0.178 | 0.171 | Bal. |
Table 4 Variation of typical chemical element with GBF treatment
Treatment | Si | Mg | Fe | Ni | Cr | Al |
---|---|---|---|---|---|---|
No GBF | 7.31 | 0.33 | 0.291 | 0.042 | 0.026 | Bal. |
15-min GBF | 7.25 | 0.43 | 1.08 | 0.178 | 0.171 | Bal. |
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