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High temperature hydrogen attack results from exposure to hydrogen at elevated temperatures and pressures. The hydrogen reacts with __________ in steel to produce _________, which cannot diffuse through the steel. The loss of carbides causes an overall loss in strength.
High temperature hydrogen attack results from exposure to hydrogen at elevated temperatures and pressures. The hydrogen reacts with __________ in steel to produce _________, which cannot diffuse through the steel. The loss of carbides causes an overall loss in strength.A . Carbides, oxygenB . Alloys, hydrogen dioxideC . Carbides, methaneD...
What type of damage can be expected to be found when the furnace is brought down for maintenance and inspection?
A steam actuated soot blower has condensate in the first steam exiting the soot blower. What type of damage can be expected to be found when the furnace is brought down for maintenance and inspection?A . Thermal fatigueB . Steam blanketingC . CreepD . Stress ruptureView AnswerAnswer: A
Corrosion rates of the anode can be high if there is a _______ anode to cathode ratio.
Corrosion rates of the anode can be high if there is a _______ anode to cathode ratio.A . LargeB . SmallC . SevereD . None of the aboveView AnswerAnswer: B
Thermal fatigue cracks usually:
Thermal fatigue cracks usually:A . Initiate on the surface of the component.B . Initiate in the subsurface of the component.C . Grow very rapidly (at the speed of sound in the material).D . Are very tight and narrow.View AnswerAnswer: A
Steel hardness, __________ and stress are critical factors in causing hydrogen stress cracking.
Steel hardness, __________ and stress are critical factors in causing hydrogen stress cracking.A . TemperatureB . Alloy compositionC . StrengthD . None of the aboveView AnswerAnswer: C
Thermal fatigue cracks propagate ________ to the stress and are usually dagger shaped, transgranular and oxide-filled.
Thermal fatigue cracks propagate ________ to the stress and are usually dagger shaped, transgranular and oxide-filled.A . AxialB . DiagonalC . TransverseD . AngularView AnswerAnswer: C
Which of the following is not a primary factor contributing to erosion-corrosion?
Which of the following is not a primary factor contributing to erosion-corrosion?A . Impact angle (angle that impacting particles strike metal)B . Tensile strength of the metalC . Velocity of impacting particlesD . Corrosiveness of the environmentView AnswerAnswer: B
Most brittle failures appear as:
Most brittle failures appear as:A . Branched cracking.B . Intergranular cracking.C . Ductile tears.D . Cleveage.View AnswerAnswer: D
Hydrogen permeation or diffusion rates have been found to be minimal at pH _______ and increase at both higher and lower pH’s.
Hydrogen permeation or diffusion rates have been found to be minimal at pH _______ and increase at both higher and lower pH’s.A . 4B . 5C . 6D . 7View AnswerAnswer: D
Application of a post-fabrication stress relieving heat treatment of about ______ is a proven method of preventing carbonate cracking.
Application of a post-fabrication stress relieving heat treatment of about ______ is a proven method of preventing carbonate cracking.A . 1100º FB . 1150º FC . 1200º FD . 1250º FView AnswerAnswer: B
