carbon superalloy such as inco 713 lc a typical composition of inco 713 lc is set forth below in weight percentages ______________________________________element min sup max ______________________________________carbon 0 05 0 07manganese 0 25sulfur 015silicon 0 50phosphorus 0 015chromium 11 0 13 0molybdenum 3 8 5 2columbium tantalum 1 5 2 5titanium 0 4 1 0boron 0 005 0 015aluminum 5 5 6 5zirconium 0 05 0 15iron 0 25copper 0 50nickel remaindercobalt if determined 1 0______________________________________ in a pull test simulation a pulling load on the blade 30 was gradually increased until failure also time dependency tests were conducted where load was leveled off at a particular preselected level and then maintained until failure occurred additionally as a baseline the blade was tested for failure load without installation of the insert 58 the design illustrated the following characteristics to establish its acceptability first with the insert 58 removed the test airfoil 30 failed at a pull load of about 4508 pounds well below the load for which the airfoil was designed to fail second the airfoil with filler pin installed and maintained at desired test temperature failed at a very high load 6680 pounds in the maximum load test wherein the pull load was gradually and steadily increased until failure third in the time dependency test the pull load was placed at design point which was about 5765 pounds load and at the desired design test temperature of about 650 u00b0 f in.