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(b) A material in cold-worked condition is more prone to hydrogen embrittlement than when it is in the annealed condition. Why? I. Dislocation density is

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(b) A material in cold-worked condition is more prone to hydrogen embrittlement than when it is in the annealed condition. Why? I. Dislocation density is higher in the annealed condition. II. Dislocation density is higher in the coldworked. III. Cracks form due to dislocation intersections and hydrogen promotes fracture. IV. All of the above

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