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Presence of hydrogen in endothermic metals causes lattice distortion.

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in Casting-Forming-Welding I by (687k points)
Presence of hydrogen in endothermic metals causes lattice distortion.

(a) True

(b) False

The question was asked during a job interview.

My question is taken from Gases in Metals topic in section Pouring – Gating Design, Melting Furnaces, Melting and Casting Quality of Casting-Forming-Welding I

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Best answer
Correct option is (b) False

The best I can explain: Hydrogen dissolves in lattice defects of endothermic metals, hence produces no distortion. In exothermic metals, hydrogen is believed to dissolve interstitially so it produces the lattice distortion in exothermic metals. (titanium, zirconium, etc.)

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