What is a common characteristic of overheating holes in titanium during drilling?

A common characteristic of overheating holes in titanium during drilling is the increased risk of cracking. When titanium is overheated, the material undergoes changes in its microstructure that can lead to brittleness in the region surrounding the hole. This increased brittleness makes the titanium more susceptible to cracking, especially under stress or during subsequent machining processes.

Additionally, overheating can diminish the overall integrity and fatigue strength of the titanium, making it less capable of withstanding loads without developing critical flaws. The correct answer emphasizes the importance of controlling temperature during drilling operations to maintain material properties and avoid damaging effects, such as cracking, which is a significant concern in aerospace applications where material reliability is crucial.