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Contrary to a pure mechanical fatigue, there is no _________ load in corrosion-assistant fatigue. Corrosion promotes failure at a lower stress and number of cycles than the materials normal endurance.
Contrary to a pure mechanical fatigue, there is no _________ load in corrosion-assistant fatigue. Corrosion promotes failure at a lower stress and number of cycles than the materials normal endurance.A . TensileB . StressC . DuctileD . Fatigue limitView AnswerAnswer: D
Sigma phase in welds can be minimized by controlling ferrite in the range of _________ for Type 347 SS.
Sigma phase in welds can be minimized by controlling ferrite in the range of _________ for Type 347 SS.A . 3%-5%B . 5%-7%C . 7%-9%D . 5%-9%View AnswerAnswer: D
___________ is the result of cyclic stresses caused by variations in temperature.
___________ is the result of cyclic stresses caused by variations in temperature.A . Cyclic crackingB . Stress crackingC . Stress fatigueD . Thermal fatigueView AnswerAnswer: D
________ is a form of erosion caused by the formation and instantaneous collapse of innumerable tiny vapor bubbles.
________ is a form of erosion caused by the formation and instantaneous collapse of innumerable tiny vapor bubbles.A . Condensate corrosionB . CavitationC . Dew-Point corrosionD . Atmospheric corrosionView AnswerAnswer: B
SSC is a form of hydrogen stress cracking resulting from the absorption of ________ that is produced by the sulfide corrosion process on the metal surface.
SSC is a form of hydrogen stress cracking resulting from the absorption of ________ that is produced by the sulfide corrosion process on the metal surface.A . Sulfur dioxideB . Hydrogen sulfideC . Atomic hydrogenD . Hydrogen chlorideView AnswerAnswer: C
Which of the following materials is susceptible to carburization?
Which of the following materials is susceptible to carburization?A . Low alloy steelsB . 300 Series SSC . 400 Series SSD . All of the aboveView AnswerAnswer: D
Corrosion under insulation is more severe between ________ and ____________.
Corrosion under insulation is more severe between ________ and ____________.A . 175º F, 212º FB . 212º F, 250º FC . 250º F, 300º FD . 25º F, 250º FView AnswerAnswer: B
A form of fatigue cracking in which cracks develop under the combined effects of cyclic loading and corrosion is called _______. Cracking often initiates at stress concentrations such as a pit in the surface.
A form of fatigue cracking in which cracks develop under the combined effects of cyclic loading and corrosion is called _______. Cracking often initiates at stress concentrations such as a pit in the surface.A . Cyclic crackingB . Corrosion fatigueC . Stress fatigueD . Stress crackingView AnswerAnswer: B
With CUI, corrosion rates __________ with increasing metal temperatures up to the point where the water evaporates quickly.
With CUI, corrosion rates __________ with increasing metal temperatures up to the point where the water evaporates quickly.A . DecreaseB . IncreaseC . Stay the sameD . None of the aboveView AnswerAnswer: B
Corrosion rates of the anode will be less affected if there is a _________ anode to cathode ratio.
Corrosion rates of the anode will be less affected if there is a _________ anode to cathode ratio.A . LargeB . SmallC . SevereD . None of the aboveView AnswerAnswer: A
