A sample of polymer III reduced in the above manner (0.0091 g.) was dissolved in 7 ml. of wet dioxane in a weighing flask; 1.75 ml. of 0.1 N sodium hydroxide was added and the solution warmed to 65°for 1.5 hours. It was then cooled and back-titrated potentiometrically with 0.1 N HC1; neut. equiv. caled. 86.0, found 84.6.Copolymerization of --Methylbenzyl Methacrylate and Maleic Anhydride.-/-a-Methylbenzyl methacrylate ([a]®D -41.48, 0.349 g., 1.83 X 10-3 mole), maleic anhydride (0.535 g., 5.46 X 10~3 mole) and a,a'-azobisisobutyronitrile (0.020 g., 0.12 X 10-3 mole) were dissolved in 3 ml. of dioxane, processed as before and irradiated for 80 hours at BO-SS0. The resulting viscous solution was precipitated four times in petroleum ether to remove unreacted maleic anhydride, freeze-dried from dioxane for 24-48 hours and dried to constant weight in a 60°vacuum oven; 0.2126 g. of copolymer was obtained. The copolymer showed characteristic peaks of absorption at 252, 258 and 263 µ (Fig. 2); [oJ25d -50.2°( c 2.1 in dioxane, l 0.5) and [M] -128°.A dioxane solution cast film showed no evidence of crystallinity by X-ray diffraction.Anal. Caled, for (CH2C(CH3)COOCH(CH3)C6H5),.5"-ÍC4H203
Enhanced P/M processing encompasses powder preparation, hot isostatic pressing (HIP) consolidation of powder, extrusion, isothermal forging, ultrasonic inspection, and machining technologies. This combination of technologies is being evaluated for producing P/M UDIMET alloy 720 turbine disks with improved quality at reduced cost.The three modeling studies reported here were undertaken to support process optimization efforts to meet the project quality and cost objectives. Defect migration modeling supports the selective ultrasonic concept that can, once validated, reduce the "buy-to-fly" weight of P/M billets and also the cost of ultrasonic inspection. HIP modeling can be used to identify the most cost-effective path to achieve the desired as-HIPed density. Simulation of the machining processes used to convert a near-net shape isothermal forging to a fmished disk can help to define the optimum machining sequence' to minimize machining cost and disk rejects. This report describes the results of efforts to develop and apply these modeling and simulation techniques.
Superalloys 2cKIoEdited byT.
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