PROBLEMS 9.30 shows the grains near a bullet hole in a sheet of tin. Explairn 1.

Question

PROBLEMS 9.30 shows the grains near a bullet hole in a sheet of tin. Explairn 1. Figure why the grain size increases with distance from the hole and then sud- denly decreases , Assume that grains have the shape of Kelvin tetrakaidecahedra (See Appendix Al for a description of a Kelvin tetrakaidecahedra). If, during recrystallization, new grains are nucleated at every corner and only at corners, what is the ratio of the number of recrystallized grains to old grains? What is the ratio of new grain diameter to old grain diameter? CURE 9.30 ed, Addison-Wesley, 1974. With permission.) 0 Grains in a tin sheet near a bullet hole revealed by etching several days after the was shot. (From A. G. Guy and J. J. Hren, Elements of Physical Metallurgy, p. 439

Explanation / Answer

1)

It happen because, grains near the bullet shot try to reduce the impact given by the bullet to the material and in doing so, they increase the grain length as to have more strength against failure. But after some point, where impact of bullet is not present, grains size reduces to become to earlier one.

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