Accession Number : AD0453480


Title :   REVIEW OF RECENT DEVELOPMENTS, METALWORKING,


Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OH DEFENSE METALS INFORMATION CENTER


Personal Author(s) : Byrer, T G ; Gehrke, J H ; Boulger, F W


Report Date : Dec 1964


Pagination or Media Count : 4


Abstract : MOLYBDENUM-FORGING PROCESS DEVELOPMENT: A manufacturing process for producing closed-die forgings of TZM molybdenum alloy to aircraft and missile requirements was developed. Ingots were wage forged to forge bars. A final forging temperature of 2775 F was used. In the forging procedure that was eventually developed, shorter transfer and forging times prevented heat losses and excessive oxidation upon exposure of the parts to the air. MoS2 performed satisfactorily as a die lubricant. The forging procedure is summarized in the following steps: (1) Extrude 4-inch-diameter extruded-and-recrystallized billet stock to 3-inch-diameter bar at 2850 to 2900 F; (2) Condition and recrystallize anneal 1 hour at 3100 F; (3) Swage forge blanks starting at 2775 (must be above 1830 F); (4) Block forge at 2775 F. PERCISION FORGING OF TURBINE WHEELS AND GEARS: The feasibility of precision forging gears and turbine wheels with integral blades was demonstrated. A radial-extrusion technique was used. The process produced highquality Rene' 41, Waspalloy, and A-286 alloy turbine wheels and AISI 9310 steel and 18% nickel maraging steel gears with continuous grain-flow patterns and improved dimensional and surface quality. DEVELOPMENT OF A 2400 F FORGING DIE SYSTEM: This program was conducted with the following objectives: (1) Determine the upper temperature limit of forging dies cast from Inconel 713C alloy; (2) Minimize the required forging sequence for steel by using the hot-die system. (Author)


Descriptors :   *FORGING , DIES , EXTRUSION , CRYSTALLIZATION , HEAT TREATMENT , MOLYBDENUM ALLOYS , NICKEL ALLOYS , STEEL , MARAGING STEELS , GEARS , TURBINE WHEELS , LUBRICANTS , AIRCRAFT


Distribution Statement : APPROVED FOR PUBLIC RELEASE