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  3. studs used in a turbo pump were made from 0.35c-1.

Studs used in a turbo pump were made from 0.35C-1.5Ni-1.0Cr-0.2Mo steel, quenched and tempered to 400...

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Mechanical Engineering

Studs used in a turbo pump were made from0.35C-1.5Ni-1.0Cr-0.2Mo steel, quenched and tempered to 400 HVhardness, cadmium-plated and baked at 200°C for 2 h. The studs usedin a turbo pump failed after 3 months of assembly. A fractograph ofa failed stud revealed a predominantly intergranular mode mixedwith ductile failure features. Increasing the baking time to 12 hconsidering the low diffusivity of hydrogen across the relativelyimpervious cadmium coating solved the problem. Explain the causeand mode of this failure.

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The role played by hydrogen in premature failures of components protected by electroplated coatings can be illustrated by the following example This is because of hydrogen premature    See Answer
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