skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Cleaning of Free Machining Brass

Abstract

We have investigated four brightening treatments proposed by two cleaning vendors for cleaning free machining brass. The experimental results showed that none of the proposed brightening treatments passed the swipe test. Thus, we maintain the recommendation of not using the brightening process in the cleaning of free machining brass for NIF application.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
891391
Report Number(s):
UCRL-TR-217975
TRN: US200621%%911
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BRASS; CLEANING; MACHINING; RECOMMENDATIONS

Citation Formats

Shen, T. Cleaning of Free Machining Brass. United States: N. p., 2005. Web. doi:10.2172/891391.
Shen, T. Cleaning of Free Machining Brass. United States. doi:10.2172/891391.
Shen, T. Thu . "Cleaning of Free Machining Brass". United States. doi:10.2172/891391. https://www.osti.gov/servlets/purl/891391.
@article{osti_891391,
title = {Cleaning of Free Machining Brass},
author = {Shen, T},
abstractNote = {We have investigated four brightening treatments proposed by two cleaning vendors for cleaning free machining brass. The experimental results showed that none of the proposed brightening treatments passed the swipe test. Thus, we maintain the recommendation of not using the brightening process in the cleaning of free machining brass for NIF application.},
doi = {10.2172/891391},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Dec 29 00:00:00 EST 2005},
month = {Thu Dec 29 00:00:00 EST 2005}
}

Technical Report:

Save / Share:
  • This specification covers one type of brass in the form of forgings and forging stock. Alloy: C37700 UNS Number: C3770.
  • An x-ray photoemission spectroscopic study was undertaken to compare the cleaning of the Advanced Photon Source (APS) aluminum extrusion storage ring vacuum chambers after machining with and without water soluble coolants. While there was significant contamination left by the coolants, the cleaning process was capable of removing the residue. The variation of the surface and near surface composition of samples machined either dry or with coolants was negligible after cleaning. The use of such coolants in the machining process is therefore recommended.
  • The present depleted uranium (DU) machining process used in the production of the M774 and M833 DU penetrators incurs excessive costs due to the necessity for burial of the radioactive metal turnings (chips). The alternative to burial was the recycling of the chips to form usable depleted uranium thereby eliminating disposal problems and increasing the supply of depleted uranium. An inert atmosphere was proposed to produce contaminate-free chips that will allow remelting to required chemical specifications of the penetrator material. A lathe enclosure was designed to provide a controlled atmosphere of argon gas maintaining a positive pressure of 0.25 psimore » within. Dry argon gas was used as a coolant at the tool workpiece interface. The chips were analyzed for oxygen and carbon content; the contaminants most critical to the remelting of the chips. The chemical analysis showed consistently low oxygen and carbon pick-up. The significance of these results was substantiated by the successful melting of depleted uranium chips in an electric resistance furnace at AMMRC.« less
  • The all weld metal tensile properties from gas tungsten arc and electron beam welds in free machining austenitic stainless steels have been determined. Ten heats with sulfur contents from 0.04 to 0.4 wt.% and a wide range in Creq/Nieq ratios were studied. Tensile properties of welds with both processes were related to alloy composition and solidification microstructure. The yield and ultimate tensile strengths increased with increasing Creq/Nieq ratios and ferrite content, whereas the ductility measured by RA at fracture decreased with sulfur content. Nevertheless, a range in alloy compositions was identified that provided a good combination of both strength andmore » ductility. The solidification cracking response for the same large range of compositions are discussed, and compositions identified that would be expected to provide good performance in welded applications.« less
  • An investigation was performed to evaluate the feasibility of reducing the number of finishing lathe cuts in the machining of Be that must be free of surface damage after subsequent heat treating or etching. Tensile, impact, and bend tests were used to determine the effects of surface damage on the mechanical properties. Optical and electron microscopic examinations were used to determine the metallographic effects of surface damage. Four different machining schedules were evaluated. Results indicate that a carefully controlled one-finishing pass method is equivalent to the carefully controlled two-finishing pass method presently being used to produce damage-free Be Rocky Flatsmore » SEM show periodic sharply and deeply cracked or torn regions of metal about 1/2 mil or 10 ..mu..m wide along the machining striations, evidences of microcracking.« less