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in subjects: "Shot Peening"

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High power laser for peening of metals enabling production technology

Laser shot peening, a surface treatment for metals, is known to induce compressive residual stresses of over 0.040 inch depth providing improved component resistance to various forms of failure. Additionally recent information suggests that thermal relaxation of the laser induced stress is significantly less than that experienced by other forms of surface stressing that involve significantly higher levels of cold work. We have developed a unique solid state laser technology employing Nd:glass s… more

Date: June 11, 1998

Creator: Daly, J; Dane, C B; Hackel, L A & Harrison, J

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Laser peening of metals- enabling laser technology

Laser peening, a surface treatment for metals, employs laser induced shocks to create deep and intense residual stresses in critical components. In many applications this technology is proving to be superior to conventional treatments such as shot peening. The laser peening process has generated sufficiently impressive results to move it from a laboratory demonstration phase into a significant industrial process. However until now this evolution has been slowed because a laser system meeting th… more

Date: November 13, 1997

Creator: Dane, C. B.; Hackel, L. A.; Daly, J. & Harrisson, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

High-Throughput Laser Peening of Metals Using a High-Average-Power Nd: Glass Laser System

Laser shot peening, a surface treatment for metals, is known to induce residual compressive stresses to depths of over 1 mm providing improved component resistance to various forms of failure. Recent information also suggests that thermal relaxation of the laser induced stress is significantly less than that experienced by other forms of surface stressing that involve significantly higher levels of cold work. We have developed a unique solid state laser technology employing Nd:glass amplifier s… more

Date: November 1, 1999

Creator: Dane, C. B.; Hackel, L. A.; Halpin, J.; Daly, J.; Harrisson, J. & Harris, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Lasershot(sm) marking system: high-volume labeling for safety-critical parts

The Lasershot Marking System uses laser pulses to safely and permanently impress identification markings on metal components. This process does not remove material or change surface chemistry and actually increases the marked area's resistance to fatigue and corrosion failure. Lasershot marking is ideally suited for marking parts used in situations where safety is critical--from hip-joint replacements to commercial airliner components. The minimum size of the mark is limited only by the resolut… more

Date: February 16, 2001

Creator: Dane, C. B.; Hackel, L.; Honig, J.; Halpin, J.; Chen, H. L.; Mendieta, F. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

High power laser for peening of metals enabling production technology

Cryogenic energy-dispersive x-ray detectors are being developed because of their superior energy resolution ((less than or equal to) 10 eV FWHM for keV x rays) compared to semiconductor EDS systems. So far, their range of application is limited due to their comparably small size and low count rate. We present data on the development of superconducting tunnel junction (STJ) detector arrays to address both of these issues. A single STJ detector has a resolution around 10 eV below 1 keV and can be… more

Date: June 18, 1998

Creator: Daly, J.; Dane, C. B.; Hackel, L. A. & Harrison, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Science and Technology Review March 2001

This issue contains the following articles: (1) ''Safety and Security Are Enhanced by Understanding Plutonium''. (2) ''Inside the Superblock'' This area of Lawrence Livermore is home to one of just two US plutonium research and development facilities for defense. (3) ''Exploring the Fundamental Limits of Simulations'' Some of the nation's leading computer simulation experts gathered at Lawrence Livermore to discuss the common barriers facing their craft. (4) ''Plutonium Up Close...Way Close'' A… more

Date: March 1, 2001

Creator: Quong, A. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

SCC INITIATION AND GROWTH RATE STUDIES ON TITANIUM GRADE 7 AND BASE METAL, WELDED, AND AGED ALLOY 22 IN CONCENTRATED GROUNDWATER

The stress corrosion crack initiation and growth rate response was evaluated on as-received, as-welded, cold worked and aged Alloy 22 (UNS N06022) and titanium Grades 7 (UNS R52400), 28 (UNS R55323) and 29 (UNS R56404) at 105-165 C in various aerated, concentrated groundwater environments. Time-to-failure experiments on actively-loaded tensile specimens at 105 C evaluated the effects of applied stress, welding, surface finish, shot peening, cold work, crevicing, and aging treatments in Alloy 22… more

Date: August 1, 2005

Creator: Payer, J.H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Laser-matter Interaction with Submerged Samples

With the long-term goal in mind of investigating if one could possibly design a 'universal solid-sample comminution technique' for debris and rubble, we have studied pulsed-laser ablation of solid samples that were contained within a surrounding fluid. Using pulses with fluences between 2 J and 0.3 J, wavelengths of 351 and 527 nm, and samples of rock, concrete, and red brick, each submerged in water, we have observed conditions in which {micro}m-scale particles can be preferentially generated … more

Date: March 25, 2010

Creator: Mariella, R., Jr.; Rubenchik, A.; Norton, M.; Donohue, G. & Roberts, K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

3M heavy duty roto peen: Baseline report; Summary

The roto peen scaler allows for the selective removal of concrete substrates. The peen is a tungsten carbide shot brazed to a hardened steel rivet that is supported by a heavy duty flexible flap. The peens are coupled with a commercially available piece of equipment that is used to scabble or remove the concrete. The scabbled debris is then collected into 55 gallon drums by means of a vacuum system. The safety and health evaluation during the human factors assessment focused on two main areas: … more

Date: July 31, 1997

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Concrete Cleaning, Inc. centrifugal shot blaster: Baseline report; Summary

The centrifugal shot blaster is an electronically operated shot-blast machine that removes layer of concrete of varying depths. Hardened steel shot propelled at a high rate of speed abrades the surface of the concrete. The depth of material removed is determined by the rate of speed the machine is traveling and the volume of shot being fired into the blast chamber. The steel shot is reused until it is pulverized to dust, which is deposited in the waste container with the concrete being removed.… more

Date: July 31, 1997

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

CO{sub 2} pellet blasting studies

Initial tests with CO{sub 2} pellet blasting as a decontamination technique were completed in 1993 at the Idaho Chemical Processing Plant (ICPP) at the Idaho National Engineering Laboratory (INEL). During 1996, a number of additional CO{sub 2} pellet blasting studies with Alpheus Cleaning Technologies, Oak Ridge National Laboratory, and Pennsylvania State University were conducted. After the testing with Alpheus was complete, an SDI-5 shaved CO{sub 2} blasting unit was purchased by the ICPP to … more

Date: January 1, 1997

Creator: Archibald, K.E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

LTC vacuum blasting machine (metal): Baseline report; Summary

The LTC coating removal system consists of several hand tools such as a Roto Peen scaler and a needlegun. They are designed to remove coatings from steel, concrete, brick, and wood. These are used with the LTC PTC-6 vacuum system to capture dust and debris as removal of the coating takes place. The PTC-6 is a vacuum system designed to be used with surface decontamination equipment. Dust and debris are captured by a high efficiency particulate filter (HEPA) vacuum system that deposits the waste … more

Date: July 31, 1997

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

3M heavy duty roto peen: Baseline report; Greenbook (chapter)

The heavy-duty roto peen technology is being evaluated at Florida International University (FIU) as a baseline technology. It is a commercially available technology and has been used for various projects at locations throughout the country. In conjunction with FIU`s evaluation of efficiency and cost, this report covers the human factors assessment for safety and health issues. The heavy-duty roto peen allows for the selective removal of concrete substrates. The peen is a tungsten carbide shot b… more

Date: July 31, 1997

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Concrete Cleaning, Inc. centrifugal shot blaster: Baseline report

The centrifugal shot blaster technology was tested and is being evaluated at Florida International University (FIU) as a baseline technology. In conjunction with FIU`s evaluation of efficiency and cost, this report covers the evaluation conducted for safety and health issues. It is a commercially available technology and has been used for various projects at locations throughout the country. The centrifugal shot blaster is an electronically operated shot blast machine that has been modified to … more

Date: July 31, 1997

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Concrete Cleaning, Inc. centrifugal shot blaster: Baseline report; Greenbook (chapter)

Date: July 31, 1997

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

3M heavy duty roto peen: Baseline report

The heavy-duty roto peen technology was being evaluated at Florida International University (FIU) as a baseline technology. It is a commercially available technology and has been used for various projects at locations throughout the country. In conjunction with FIU`s evaluation of efficiency and cost, this report covers the human factors assessment for safety and health issues. The heavy-duty roto peen allows for the selective removal of concrete substrates. The peen is a tungsten carbide shot … more

Date: July 31, 1997

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Correlation Between Two Types of Surface Stress Mitigation and the Resistance to Corrosion of Alloy 22

When metallic plates are welded, residual tensile stresses may develop in the vicinity of the weld seam. Processes such as Low Plasticity Burnishing (LPB) and Laser Shock Peening (LSP) could be applied locally to eliminate the residual stresses produced by welding. In this study, Alloy 22 (N06022) plates were welded and then the above-mentioned surface treatments were applied to eliminate the residual tensile stresses. The aim of the current study was to compare the corrosion behavior of as-wel… more

Date: February 4, 2005

Creator: Yilmaz, A.; Fix, D. V.; Estill, J. C. & Rebak, R. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Rotary peening with captive shot

Roto Peen with captive shot removes coatings and surface contamination from concrete floors. The objective of treating radioactively contaminated concrete floors during the Deactivation and Decommissioning (D and D) process is to reduce the surface contamination levels to meet regulatory criteria for unrestricted use. The US Department of Energy (DOE) Chicago Operations office and DOE`s Federal Energy Technology Center (FETC) jointly sponsored a Large-Scale Demonstration Project (LSDP) at the C… more

Date: February 1, 1998

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

LTC American`s, Inc. vacuum blasting machine: Baseline report

The LTC shot blast technology was tested and is being evaluated at Florida International University (FIU) as a baseline technology. In conjunction with FIU`s evaluation of efficiency and cost, this report covers the evaluation conducted for safety and health issues. It is a commercially available technology and has been used for various projects at locations throughout the country. The LTC 1073 Vacuum Blasting Machine uses a high-capacity, direct-pressure blasting system which incorporates a co… more

Date: July 31, 1997

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

FeAl and Mo-Si-B Intermetallic Coatings Prepared by Thermal Spraying

FeAl and Mo-Si-B intermetallic coatings for elevated temperature environmental resistance were prepared using high-velocity oxy-fuel (HVOF) and air plasma spray (APS) techniques. For both coating types, the effect of coating parameters (spray particle velocity and temperature) on the microstructure and physical properties of the coatings was assessed. Fe-24Al (wt.%) coatings were prepared using HVOF thermal spraying at spray particle velocities varying from 540 m/s to 700 m/s. Mo-13.4Si-2.6B co… more

Date: April 22, 2003

Creator: Totemeier, T. C.; Wright, R. N. & Swank, W. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Effect of Surface Stress Mitigation on the Corrosion Behavior of Alloy 22

When metallic plates are welded, for example using the Gas Tungsten Arc Welding (GTAW) process, residual tensile stresses may develop in the vicinity of the weld seam. Processes such as Low Plasticity Burnishing (LPB) and Laser Shock Peening (LSP) could be applied locally to eliminate the residual stresses produced by welding. In this study, Alloy 22 (N06022) plates were welded and then the above-mentioned surface treatments were applied to eliminate the residual tensile stresses. The aim of th… more

Date: November 10, 2004

Creator: Fix, D. V.; Yilmaz, A.; Wong, L. L.; Estill, J. C. & Rebak, R. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Pentek metal coating removal system: Baseline report; Greenbook (chapter)

The Pentek coating removal technology was tested and is being evaluated at Florida International University (FIU) as a baseline technology. In conjunction with FIU`s evaluation of efficiency and cost, this report covers evaluation conducted for safety and health issues. It is a commercially available technology and has been used for various projects at locations throughout the country. The Pentek coating removal system consisted of the ROTO-PEEN Scaler, CORNER-CUTTER{reg_sign}, and VAC-PAC{reg_… more

Date: July 31, 1997

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Pentek metal coating removal system: Baseline report

Date: July 31, 1997

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Pilot-scale treatability testing -- Recycle, reuse, and disposal of materials from decontamination and decommissioning activities: Soda blasting demonstration

The US Department of Energy (DOE) is in the process of defining the nature and magnitude of decontamination and decommissioning (D and D) obligations at its sites. With disposal costs rising and available storage facilities decreasing, DOE is exploring and implementing new waste minimizing D and D techniques. Technology demonstrations are being conducted by LMES at a DOE gaseous diffusion processing plant, the K-25 Site, in Oak Ridge, Tennessee. The gaseous diffusion process employed at Oak Rid… more

Date: August 1995

Item Type: Report

Partner: UNT Libraries Government Documents Department