Manufacturing Methods for Surface Integrity Machined Structural Components
Final rept. 15 Jul 1970-15 Oct 1971
METCUT RESEARCH ASSOCIATES INC CINCINNATI OH
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A surface integrity evaluation of several iron, titanium and nickel base structural alloys was completed. Materials investigated include AISI 4340, 4340 modified, Grade 300 Maraging Steel, Ti-6Al-6V-2Sn, Ti-6Al-2Sn-4Zr-2Mo, Inconel 718, AF95, Rene 80 and AF2-1DA. For the most part, these alloys were quenched and tempered or solution treated and aged, as appropriate, to put them into a high strength structural condition. Wide variations in fatigue strength were documented for the above mentioned alloys under the following metal removal conditions surface grinding, hand sanding, end milling-peripheral cutting, end milling-end cutting, EDM and ECM. Guidelines for processing of aerospace hardware in such a way as to assure good surface integrity have been developed and presented in this report. Control of cutting tool sharpness as well as proper selection of processing parameters are prime requirements.
- Fabrication Metallurgy