Engineering Materials
Recrystallization temperature is one

At which change of allotropic form takes place
At which crystals first start forming from molten metal when it is cooled
At which crystals grow bigger in size
At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated

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Engineering Materials
Points of arrest for iron correspond to

Stages at which properties do not change with increase in temperature
There is nothing like points of arrest
Stages at which further heating does not increase temperature for some time
Stages at which allotropic forms change

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Engineering Materials
Inconel contains

68% nickel, 29% copper and 3% other constituents
80% nickel and 20% chromium
80% nickel, 14% chromium and 6% iron
65% nickel, 15% chromium and 20% iron

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