API 571 Certification (Corrosion & Materials) Practice Test

Which type of metal is affected by creep?

1. Only Carbon Steel

2. All metals and alloys

3. High Carbon Alloys

4. Low Alloy Steels

The correct answer is: All metals and alloys

The correct choice acknowledges that all metals and alloys can be affected by creep, given the appropriate conditions such as high temperatures and sustained loads over time. Creep is a time-dependent deformation that occurs when materials are subjected to high stress or high temperatures, leading to gradual elongation. This phenomenon is a critical consideration in engineering, particularly for materials used in high-temperature applications like power plants, gas turbines, and other applications where mechanical components may operate under continuous stress. While it is more prevalent in certain metals such as aluminum, titanium, and some high-temperature alloys due to their microstructural characteristics, the fundamental principle is that any metal or alloy can experience creep if the conditions are conducive. This understanding is essential for materials selection and the design of components in environments where creep may be a concern, ensuring longevity and safety in applications.