Machinability aspects of heat-treated Al-(6-11)%Si cast alloys :

Zedan, Yasser

doi:10.1522/030145370

Cited by 7 publications

(5 citation statements)

References 67 publications

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“…The qualitative inspection of the drilling chips obtained from the second set revealed that the form of the chips resulting from the 396 and B319.2 alloys closely approached a fan-shaped form and was by far the predominant form of all the chips formed, as shown in Figure 14. These observations are in good agreement with the work of Zedan [26], who reported that these chips are formed when conical chips are unable to curl sufficiently to follow the flute, and they thus tend to fracture prior to one complete revolution of the…”

Section: Chip Formationsupporting

confidence: 92%

Effect of Intermetallics and Drill Materials on the Machinability of Al-Si Cast Alloys

et al. 2022

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The present study was conducted on the machinability of the 396 alloy (containing approximately 11% Si) and the B319.2 alloy mainly to emphasize the effects of Fe-intermetallics, i.e., α-Fe, β-Fe, and sludge. The results demonstrate that the presence of sludge in the form of hard spots has a significant effect on cutting forces and tool life, in that it decreases drill life by 50% compared to the base alloy. The formation of the α-Fe phase in the M1 base alloy has a beneficial effect on tool life in that this alloy produces the highest number of holes drilled compared to alloys containing sludge or β-Fe; this result may be explained by the fact that the formation of the α-Fe intermetallic, with its rounded Chinese script morphology and its presence within α-Al dendrites, is expected to improve matrix homogeneity via hardening of the soft α-Al dendrites. Increasing the Fe-content from 0.5% to 1% in the 396-T6 alloy containing 0.5% Mn produces a distinct improvement in alloy machinability in terms of cutting force and tool life. The addition of Fe and/or Mn appears to have no discernible effect on the build-up edge area (BUE) and chip shape.

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Section: Chip Formationsupporting

confidence: 92%

Effect of Intermetallics and Drill Materials on the Machinability of Al-Si Cast Alloys

et al. 2022

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“…Table 7 provides the relevant data relating to T6 heat-treated mechanical properties; these include the hardness (BHN), yield strength (YS), ultimate tensile strength (UTS), and percent elongation (%El) of the Sr-modified 396 alloys after the addition of Sn and Bi [ 14 ]. The corresponding hardness data indicate that the M7 alloy containing 0.5%Bi has the highest hardness values compared with the other alloys.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 2 b displays the thread gauge that was used for conducting the Go/No-Go test. Reference diameters of 6.5024 to 6.5278 mm and 7.02056 to 7.15518 mm from the Go/No-Go gauge test were applied to the drilling and tapping processes, respectively [ 14 ].…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…Tapping was carried out immediately after drilling for the drilled holes over the full plate. The cutting conditions for drilling and tapping are listed in Table 4 [ 14 ]. Since increasing temperatures and the potential accumulation of hot chips at the bottom of the hole tend to present serious problems, a pressurized coolant was pumped through the drill to ensure adequate cooling and chip evacuation.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…The lower strength values of the alloys containing added Sn result from the distribution of soft fine particles of β-Sn, mainly on the grain boundaries, as well as from the formation of other intermetallic compounds such as Mg 2 Sn [ 14 ]. Tin and In, to a certain extent, are used most frequently as substituents.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Trace Elements on the Microstructural and Machinability Characteristics of Al–Si–Cu–Mg Castings

et al. 2022

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This study was undertaken to emphasize the influence of Sn and Bi addition on the machinability of Sr-modified, grain-refined, and heat-treated Al–Si B319 and 396 alloys. Drilling and tapping tests were conducted to examine the cutting forces, tool life, tool wear, built-up edge evolution, and chip shape. Microstructures were examined using optical and electron microscopy. Drilling test results show that the B319.2 alloy with 0.15%Sn yields the longest drill life, i.e., twice that of the B319.2 alloy containing 0.5%Bi, and one-and-a-half times that of the B319.2 alloy containing 0.15%Sn + 0.5%Bi. The presence of 0.5%Bi in the B319.2 alloy causes a deterioration of drill life (cf., 1101 holes with 2100 holes drilled in the B319.2 alloy containing 0.15%Sn). The α-Fe phase in the 396 alloy produces the highest number of holes drilled compared with alloys containing sludge or β-Fe. The presence of sludge decreases the drill life by 50%. Built-up edge (BUE) measurements and optical photographs show little change in the BUE width for different numbers of holes except for the B319.2 alloy containing 0.5%Bi, which shows a slightly lower width (0.166 mm) compared with that containing 0.15% Sn (0.184 mm) or 0.15%Sn + 0.5%Bi (0.170 mm).

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Parameters Controlling Drilling and Tapping Characteristics of Aluminum Based Alloys

Barakat,

Zedan,

Samuel

et al. 2024

The Minerals, Metals &Amp; Materials Series

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Machinability aspects of heat-treated Al-(6-11)%Si cast alloys :

Cited by 7 publications

References 67 publications

Effect of Intermetallics and Drill Materials on the Machinability of Al-Si Cast Alloys

Effect of Intermetallics and Drill Materials on the Machinability of Al-Si Cast Alloys

Effects of Trace Elements on the Microstructural and Machinability Characteristics of Al–Si–Cu–Mg Castings

Parameters Controlling Drilling and Tapping Characteristics of Aluminum Based Alloys

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