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What causes the golf-ball depressions on zinc-pot walls after usage?

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Q. We have analysed in detail the failure of our zinc pots over the last 20 years and have reasonably understood the root cause of them.
What I, and others too, fail to appreciate is the cause of the peculiar type of depressions on the walls. Is it the impurities in the near perfect ARMCO steel?
Or the localised heating? But why such sporadic hemispherical depressions? There must be some metallurgical /physical reasons to it.

Can you throw some light upon this please?
Two photos from a failed zinc pot (ARMCO steel) are attached:

61556-1a

61556-1b

Shantanu Chakrabarti
- Jamshedpur INDIA
June 17, 2023

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