Anisotropy of the process of fission of U238 by 14 Mev neutrons

The double ionization-chamber method is used to study the angular distribution of the fragments produced by the fission of U²³⁸ by neutrons with energy 14.4 Mev. It is found that to an accuracy of 3 percent the angular distributions of the light and heavy fragments are symmetric with respect to the direction perpendicular to the neutron beam. Furthermore, it is shown that the directions of emergence of the light and heavy fragment are equally privileged, both in symmetric and in asymmetric fissions. It is found that for ratios of the masses of the fragments less than 1.7–1.8, the angular anisotropy increases with increase of the asymmetry of the masses. The results are discussed from the point of view of the statistical theory of V. M. Strutinskii.In conclusion the authors express their gratitude to M. I. Kuznetsov, who helped with building the pulse analyzer, and to all the group operating the accelerator.     

Profile grinding of single-cutter bit leg races

Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 6, p. 34, June, 1992.     

An investigation of bars of an Mg-Y-Cd system alloy after a strengthening heat treatment

Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp. 39–40, September, 1988.     

Effects of carbide-forming elements on the response to thermal treatment of the X45Cr13 martensitic stainless steel

The effects of carbide-forming elements on the response to thermal treatment of the X45Cr13 martensitic stainless steel have been investigated. Heat treatments consisted of austenitizing for 60 s at temperatures ranging from 1000–1250 °C. The higher is the solution treatment temperature, the less M23C6 carbide is left out of solution in the austenite. As a result, the concentration of carbon and alloying elements in the martensite increases and, therefore, an increase in the hardness until a maximum value of 710 HV was found at austenitizing temperatures of 1120 and 1130 °C for the steels X45Cr13 and X45CrMoV14, respectively. At higher austenitizing temperatures, the presence of retained austenite was observed, which leads to a lowering of the hardness value. The higher amount of carbide-forming elements in the X45CrMoV14 determines an increase in retained austenite from 3 vol% to about 30 vol%. Thus, a drop in the hardness value from 710 to 680 and 585 for the steels X45Cr13 and X45CrMoV14, respectively, was found. © 1998 Kluwer Academic Publishers