Freckling of superalloy ingots. Refer to the Journal of Metallurgy (Sept. 2004) study of freckling of superalloy ingots, presented in Exercise. Recall that freckles are defects that sometimes form during the solidification of the ingot. The freckle index for each of n = 18 superalloy ingots is shown in the next table and saved in the FRECKLE file. In the population of superalloy ingots, is there evidence to say that 50% of the ingots have a freckle index of 10 or higher? Test, using α =.01
30.1 | 22.0 | 14.6 | 16.4 | 12.0 | 2.4 | 22.2 | 10.0 | 15.1 |
12.6 | 6.8 | 4.1 | 2.5 | 1.4 | 33.4 | 16.8 | 8.1 | 3.2 |
Freckling of superalloy ingots. Freckles are defects that sometimes form during the solidification of alloy ingots. A freckle index has been developed to measure the level of freckling on the ingot. A team of engineers conducted several experiments to measure the freckle index of a certain type of superalloy ( Journal of Metallurgy , Sept. 2004). The data for n = 18 alloy tests are shown in the table and saved in the FRECKLE file.
12.6 | 22.0 | 4.1 | 16.4 | 1.4 | 2.4 |
16.8 | 10.0 | 3.2 | 30.1 | 6.8 | 14.6 |
2.5 | 12.0 | 33.4 | 22.2 | 8.1 | 15.1 |
Based on Yang, W. H. “A freckle criterion for the solidification of superalloys with a tilted solidification front." JOM: Journal of the Minerals, Metals and Materials Society, Vol. 56, No. 9, Sept. 2004.
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