____________ is the reduction in toughness due to a metallurgical change that can occur in some low alloy steels as a result of long-term exposure in the temperature range of about 650?F to 1100?F.
A. Hardening
B. Graphitization
C. Spheroidization
D. Temper embrittlement
_________ is a mechanical form of degradation that occurs when a component is exposed to cyclical stresses for an extended period, often resulting in sudden, unexpected failure.
A. Stress fatigue
B. Mechanical fatigue
C. Thermal fatigue
D. Cyclic fatigue
Which of these materials are susceptible to brittle fracture?
A. Carbon steels
B. Low alloy steels
C. 400 Series SS
D. All of the above
Which of the following is not a method used to prevent brittle fracture?
A. Thorough inspections
B. Strict controls on selecting construction materials
C. Post weld heat treatment
D. Controlling minimum operating temperatures
What method is most used to assure boiler feed water corrosion is not occurring?
A. Spot UT readings at turbulent areas
B. Profile RT at turbulent areas
C. Profile RT at stagnant areas
D. Laboratory analysis of boiler feedwater
The level of creep damage is a function of the material and the coincident _________ level at which the creep deformation occurs.
A. Pressure/Temperature
B. Pressure/Stress
C. Temperature/Stress
D. None of the above
Susceptibility to hydrogen stress cracking __________ with __________ hardness.
A. Increases, increasing
B. Decreases, increasing
C. Decreases, Decreasing
D. Both A and C
Many thermal fatigue cracks are filled with:
A. chlorides.
B. hydroslime.
C. oxides.
D. sulfides.
__________ is usually found in aqueous environments or services where water is sometimes or always present, especially where stagnant or low-flow conditions allow the growth of microorganisms.
A. MIC
B. HIC
C. SOHIC
D. None of the above
________ and _______ damage develop without applied or residual stress so that PWHT will not prevent them from occurring.
A. SOHIC, Blistering
B. SCC, SOHIC
C. HIC, SCC
D. Blistering, HIC
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