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Title: Investigation of the Use of Laser Shock Peening for Enhancing Fatigue and Stress Corrosion Cracking Resistance of Nuclear Energy Materials

Abstract

The objective of this project, which includes close collaboration with scientists from INL and ANL, is to investigate and demonstrate the use of advanced mechanical surface treatments like laser shock peening (LSP) and ultrasonic nanocrystal surface modification (UNSM) and establish baseline parameters for enhancing the fatigue properties and SCC resistance of nuclear materials like nickel-based alloy 600 and 304 stainless steel. The research program includes the following key elements/tasks: 1) Procurement of Alloy 600 and 304 SS, heat treatment studies; 2) LSP and UNSM processing of base metal and welds/HAZ of alloys 600 and 304; (3) measurement and mapping of surface and sub-surface residual strains/stresses and microstructural changes as a function of process parameters using novel methods; (4) determination of thermal relaxation of residual stresses (macro and micro) and microstructure evolution with time at high temperatures typical of service conditions and modeling of the kinetics of relaxation; (5) evaluation of the effects of residual stress, near surface microstructure and temperature on SCC and fatigue resistance and associated microstructural mechanisms; and (6) studies of the effects of bulk and surface grain boundary engineering on improvements in the SCC resistance and associated microstructural and cracking mechanisms

Authors:
 [1];  [2];  [2];  [3];  [3]
  1. Univ. of Cincinnati, OH (United States)
  2. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Univ. of Cincinnati, OH (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
Contributing Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
OSTI Identifier:
1347705
Report Number(s):
10-682
10-682
DOE Contract Number:
AC07-05ID14517
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS

Citation Formats

Vasudevan, Vijay K., Jackson, John, Teysseyre, Sebastien, Alexandreanu, Bogdan, and Chen, Yiren. Investigation of the Use of Laser Shock Peening for Enhancing Fatigue and Stress Corrosion Cracking Resistance of Nuclear Energy Materials. United States: N. p., 2017. Web. doi:10.2172/1347705.
Vasudevan, Vijay K., Jackson, John, Teysseyre, Sebastien, Alexandreanu, Bogdan, & Chen, Yiren. Investigation of the Use of Laser Shock Peening for Enhancing Fatigue and Stress Corrosion Cracking Resistance of Nuclear Energy Materials. United States. doi:10.2172/1347705.
Vasudevan, Vijay K., Jackson, John, Teysseyre, Sebastien, Alexandreanu, Bogdan, and Chen, Yiren. Tue . "Investigation of the Use of Laser Shock Peening for Enhancing Fatigue and Stress Corrosion Cracking Resistance of Nuclear Energy Materials". United States. doi:10.2172/1347705. https://www.osti.gov/servlets/purl/1347705.
@article{osti_1347705,
title = {Investigation of the Use of Laser Shock Peening for Enhancing Fatigue and Stress Corrosion Cracking Resistance of Nuclear Energy Materials},
author = {Vasudevan, Vijay K. and Jackson, John and Teysseyre, Sebastien and Alexandreanu, Bogdan and Chen, Yiren},
abstractNote = {The objective of this project, which includes close collaboration with scientists from INL and ANL, is to investigate and demonstrate the use of advanced mechanical surface treatments like laser shock peening (LSP) and ultrasonic nanocrystal surface modification (UNSM) and establish baseline parameters for enhancing the fatigue properties and SCC resistance of nuclear materials like nickel-based alloy 600 and 304 stainless steel. The research program includes the following key elements/tasks: 1) Procurement of Alloy 600 and 304 SS, heat treatment studies; 2) LSP and UNSM processing of base metal and welds/HAZ of alloys 600 and 304; (3) measurement and mapping of surface and sub-surface residual strains/stresses and microstructural changes as a function of process parameters using novel methods; (4) determination of thermal relaxation of residual stresses (macro and micro) and microstructure evolution with time at high temperatures typical of service conditions and modeling of the kinetics of relaxation; (5) evaluation of the effects of residual stress, near surface microstructure and temperature on SCC and fatigue resistance and associated microstructural mechanisms; and (6) studies of the effects of bulk and surface grain boundary engineering on improvements in the SCC resistance and associated microstructural and cracking mechanisms},
doi = {10.2172/1347705},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Mar 07 00:00:00 EST 2017},
month = {Tue Mar 07 00:00:00 EST 2017}
}

Technical Report:

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  • Laser peening is an emerging modern process that impresses a compressive stress into the surfaces of metals. Treatment can reduce the rate of fatigue cracking and stress-corrosion-cracking in metals (such as gears, bolts and cutters) needed for tunnel boring and other construction & mining applications. Laser peening could also be used to form metals or alloys into a precise shape without yielding and leaving both sulfates in a crack resistant compressive state.
  • Shot peening is a cold working process where spherical media called shot bombards the surface of a part. Each piece of shot acts as a tiny peening hammer imparting to the surface a small dimple. In the process, the surface fibers of the material are yielded in tension. Below the surface, the fibers try to restore the surface to its original shape thereby producing a hemisphere of cold worked material highly stressed in compression. Completely overlapping dimples develop an even layer of residual compressive stress. Stress Corrosion Cracking (SCC) is a progressive fracture mechanism caused by the simultaneous interaction ofmore » a corrodent and a sustained tensile stress. The tensile stresses necessary for SCC are static and they may be residual and/or applied. Fatigue is also a progressive fracture mechanism caused by tensile stresses, but these stresses are dynamic and they usually lead to failure without the necessary simultaneous action of a corrodent. Compressive residual stresses such as those induced by controlled shot peening can be used to prevent or delay SCC and fatigue cracking, regardless of the materials or corrodents involved. This paper will deal with the theory and controls of the shot peening process, and with some of its applications on heat exchangers and feedwater heaters.« less
  • Stress corrosion cracking (SCC) in the Yucca Mountain waste package closure welds is believed to be the greatest threat to long-term containment. Use of stress mitigation to eliminate tensile stresses resulting from welding can prevent SCC. A laser technology with sufficient average power to achieve high throughput has been developed and commercially deployed with high peak power and sufficiently high average power to be an effective laser peening system. An appropriately applied version of this process could be applied to eliminate SCC in the waste package closure welds.
  • Laser peening is an emerging modern process that impresses a compressive stress into the surface of metals or alloys. This treatment can reduce the rate of intergranular stress corrosion cracking and fatigue cracking in structural metals or Alloy 600 needed for nuclear power plants.
  • A comprehensive study is reported on the stress corrosion cracking and corrosion fatigue behavior of Type 403SS turbine blade alloy and ASTM A-471 turbine disk steel in simulated low pressure steam turbine environments. The studies have been carried out using temperature, electrolyte type and concentration, loading wave form, R-ratio, potential, and metallurgical state of the steel as the principal experimental variables, with the ultimate goal in mind of identifying various mechanisms for crack propagation. Extensive electrochemical polarization studies are also reported and the results of this work have been used to characterize the corrosion and electrochemical state of any givenmore » alloy in an environment of interest. Some work is also reported on identifying potential inhibitors of stress corrosion cracking and corrosion fatigue in these steels in simulated low pressure steam turbine environments. A number of effective inhibitors have been identified. Finally, hydrogen permeation and trapping studies on ASTM A-471 were carried out to determine whether or not this steel is susceptible to hydrogen embrittlement or hydrogen-assisted crack propagation. These studies show that at ambient temperature, and to a lesser extent at elevated temperature (90/sup 0/C), ASTM A-471 is susceptible to hydrogen-induced crack propagation in simulated low pressure steam turbine environments. 12 refs.« less