A nickel–titanium alloy is used to make components for jet turbine aircraft engines

A nickel–titanium alloy is used to make components for jet turbine aircraft engines. Cracking is a potentially serious problem in the final part, because it can lead to nonrecoverable failure. A test is run at the parts producer to determine the effect of four factors on cracks. The four factors are pouring temperature (A), titanium content (B), heat treatment method (C), and amount of grain refiner used (D). A single replicate of a 24 design is run, and the lengths (in millimeters) of three cracks induced in a sample coupon subjected to a standard test are measured.


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