Publications

Displaying 26 - 50 of 93

The effect of thermal oxidation on laser-induced photoelectron emission during tensile deformation of polycrystalline aluminum

April 1, 2010

Author(s)

M Cai, S C. Langford, Richard E. Ricker, Lyle E. Levine, J T. Dickinson

Many metals emit electrons when exposed to UV radiation from excimer lasers (photon energies 4 eV to 8 eV). Deformation can significantly affect the intensity of these emissions. In the case of reactive metals, these emissions are also altered by the

Interim Report on the Examination of Corrosion Damage in Homes Constructed with Imported Wallboard I. Examination of Samples Received September 28, 2009

November 30, 2009

Author(s)

David J. Pitchure, Richard E. Ricker

Since many household systems are fabricated out of metallic materials, changes to the household environment that accelerate corrosion rates will increase the frequency of failures in these systems. Recently, it has been reported that homes constructed with

Thermodynamic Evaluation of the Propensity of Niobium to Absorb Hydrogen During Fabrication of Superconducting Radio Frequency Accelerator Cavities

October 2, 2009

Author(s)

Richard E. Ricker

During the fabrication of niobium superconducting radio frequency (SRF) particle accelerator cavities procedures are used that chemically or mechanically remove the passivating surface film of niobium pentoxide (Nb2O5). Removal of this film will expose the

The Influence Of Hydrogen On The Elastic Modulus And Anelastic Response Of Cold Worked Pure Iron

July 1, 2009

Author(s)

Richard E. Ricker, David J. Pitchure

Understanding the influence of hydrogen on elastic deformation and anelastic response should contribute to our understanding of the influence of hydrogen on deformation and fracture. To accomplish this objective, samples of pure iron were cold-worked

On Using Laboratory Measurements to Predict Corrosion Service Lives for Engineering Applications

July 1, 2008

Author(s)

Richard E. Ricker

Issues concerning making corrosion service life predictions on the basis of laboratory measurements are examined. Models for corrosion service life prediction will reduce corrosion failures and operation costs by enabling better design, alloy selection

Investigations of Residual Stresses and Mechanical Properties of Single Crystal Niobium for SRF Cavities

September 1, 2007

Author(s)

Thomas H. Gnaeupel-Herold, Ganapati Rao Myneni, Richard E. Ricker

NIST Workshop on Materials Test Procedures for Hydrogen Pipelines

September 1, 2007

Author(s)

Thomas A. Siewert, Joseph D. McColskey, Richard E. Ricker

The Materials Reliability and Metallurgy Divisions have expanded their efforts to advance the technology for the construction, repair, and inspection of pipelines. One key factor is to identify and prioritize the research needs of the pipeline community

Carbon-Containing Tetragonal Defects in 316L Austenitic Stainless Steel Carburized Under Paraequilibrium Conditions: An Internal Friction Study

June 1, 2007

Author(s)

A H. Heuer, F Ernst, H Kahn, G M. Michal, David J. Pitchure, Richard E. Ricker

An internal friction study was conducted into the strengthening mechanism of low-temperature, paraequilibrium, carburization of stainless steel. Low temperature carburization of stainless steels results in hard surfaces with high residual compressive

The Recovery of Elastic Properties at 35 C in Trip 700 Steel Following Deformation

June 1, 2007

Author(s)

David J. Pitchure, Richard E. Ricker

The influence of plastic deformation on the elastic properties that determine the magnitude of springback following forming was investigated using dynamic modulus analysis. For this study, the elastic modulus of TRIP 700 steel was measured continuously at

Analysis of Pipeline Steel Corrosion Data

May 2, 2007

Author(s)

Richard E. Ricker

Currently, the U.S. has over 3.7 million kilometers (2.3 million miles) of pipelines crossing the country transporting natural gas and hazardous liquids from sources such as wells, refineries, and ports to customers. It is estimated that almost 2/3 of the

Corrosion of Intermetallics

November 1, 2005

Author(s)

P K. Datta, H L. Du, J S. Burnell-Gray, Richard E. Ricker

In many applications of structural materials - aerospace, automobiles, power generation, etc., increasing demands are being made for materials with temperature capabilities greater than those of superalloys. Intermetallics with higher melting points can

Advanced Coatings R&D for Pipelines and Related Facilities

September 1, 2005

Author(s)

Richard E. Ricker

This workshop was held at the National Institute of Standards and Technology s Gaithersburg, Maryland campus June 9-10, 2005 with support from the Office of Pipeline Safety of the U.S. Department of Transportation. A steering committee composed of 20

Effect of Plastic Strain on Modulus and Springback Predictions of an Aluminum Alloy

January 4, 2005

Author(s)

Li Ma, Richard E. Ricker

This paper examines the hypothesis that the under-prediction errors of current finite element analysis (FEA) springback models would be eliminated by the inclusion of changes that occur in the elastic modulus with the large plastic strains of forming. This

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