DEVELOPMENT OF IMPROVED METHODS, PROCESSES, AND TECHNIQUES FOR PRODUCING STEEL EXTRUSIONS
Interim engineering rept. no. 8, 9 Mar-30 Jun 1961
NORTHROP CORP HAWTHORNE CA NORAIR DIV
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Dimensional integrity and surface qualities obtained in the 0.06-in. tee sections of Phase I ARE CONSIDERED SUFFICIENT FOR PROCEEDING TO Phase II. Low and erratic mechanical properties were noted in the evaluation of Phase I extrusions in both H-11 and PH 15-7Mo materials. Metallurgical studies indicated that these low properties resulted from diffusion of the nickel lubricant material into the surface of the extrusions. After removal of the contaminant coating by chemical etching, the resultant mechanical properties were well within specifications for the materials. The chemical etching also yields improved surface quality.
- Fabrication Metallurgy