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  1. Combined macrosopic and microscopic approach to the fracture of metals, period July 1974--June 1975. Technical progress report No. 38 [electronic resource]

    Providence, R.I. : Brown University ; Oak Ridge, Tenn. : distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1975

    During the report period major studies have been completed on (1) the microscale fracture conditions for the brittle and ductile fracture initiation modes at a macroscopic crack tip, (2) the formulation of dilational plasticity constitutive relations for void containing materials as applied to the inception of ductile rupture, (3) cavity growth during diffusive rupture processes as encountered in creep rupture at low stress but high temperature, and (4) particle and boundary strengthening mechanisms in carbon steels. In addition, work has continued on crack tip modeling by finite elements and mechanisms of ductile void growth near a crack tip. (auth)

    Online OSTI

  2. Y-12 development organization technical progress report, Part 3 [electronic resource] : Metal processing period ending March 1, 1995

    Washington, D.C. : United States. Dept. of Energy. ; Oak Ridge, Tenn. : distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1995

    In an effort to integrate vertically the manufacturing processes at the Oak Ridge Centers for Manufacturing Technology (ORCMT) and at the same time obtain higher quality nickel-aluminium-bronze castings more quickly than outside sources were providing, a development program was started, addressing the problems of castings these types of components. Several small demonstration castings were made under vacuum and in graphite to assess the quality achievable by using this system.

    Online OSTI

  3. Y-12 development organization technical progress report [electronic resource] : Part 3 - metal processing, period ending September 1, 1994

    Washington, D.C. : United States. Dept. of Energy. ; Oak Ridge, Tenn. : distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1995

    The authors melted and cast an aluminum-uranium (Al-U) alloy by vacuum induction melting (VIM) prealloyed buttons made by arc melting. The resulting alloy casting displayed a large compositional gradient from top to bottom. The authors sampled the resulting casting for uranium to check homogeneity. The sampling revealed that the top of the casting contained 23.5 wt% uranium, and the bottom (an average of two samples) contained 42.4 wt% uranium. Although each button contained 36.5% uranium, these analyses show that the solidified casting was inhomogeneous. If the buttons were homogeneous, the segregation occurred during induction melting, and this method may not be feasible for making AL-U alloys. If the buttons were not homogeneous, perhaps arc melting the buttons more times would have helped. Bottom pouring the Al-U melt into a mold for faster cooling could also help prevent segregation.

    Online OSTI

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