Equipment that is temper embrittled may be susceptible to _______ during start-up and shutdown.

In most cases, brittle fracture occurs only at temperatures below the Charpy impact transition temperature. Steel cleanliness and ________ have a significant influence on toughness and resistance to brittle fracture.

Mechanical fatigue can cause cracks that initiate from the surface and often form a:

Nickel based alloys usually contain ________ nickel.

___________ is the result of cyclic stresses caused by variations in temperature.