Plastic deformation of metals subjected to intensive sources
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The elastoplastic strain of metals being formed when they melt under the effect of a point heat source with a pulse duration greater than 10−6 sec is considered in this paper. The time development of the plastic strain and pressure domains in the melt is investigated. It is shown that two plastic strain domains occur during the interaction under consideration: a relatively broad domain of “mechanical” influence and a narrow domain of “thermal” influence. The stress-strain distributions as well as the hydrostatic pressure in the fluid are determined by a quasistationary temperature distribution starting with times corresponding to half (of the quasistationary) the value of the melt radius X∼ 0.5. It is shown that the dimensions of the weak and strong plastic strain domains formed by heat and acoustic waves grow continuously to the quasistationary values, while the hydrostatic pressure in the fluid reaches the maximum value for X ∼ 0.3...0.4. The ratio between the radii of the plastic strain zones and of the liquid bath for a quasistationary temperature distribution in the first domain lies within the range 10–50, and does not exceed 1.7 for Cu, Ni, and Fe in the second. The anomalous nature of the development of the strong plastic strain domain in Al, because of migration of the metal grain boundaries to result in “collapse” of the domain for the values X ∼ 0.5 accompanied by a jumplike diminution in the hydrostatic pressure in the fluid, is noted.
KeywordsMigration Plastic Deformation Plastic Strain Heat Source Pulse Duration
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