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Title: Tensile deformation and recovery kinetics of Alloy 690. Final report

Abstract

The effect of carbon content, grain size and thermal history on the deformation behavior of nickel-base Alloy 690 has been investigated. Carbon content effects the yield strength of Mill Annealed (MA) material, but has no effect in Thermally Treated (TT) material. Also, no effect of carbon content on the workhardening rate was seen in either material. There was an effect of grain size as expected. An interesting aspect of this work showed that TT material consistently has a slightly higher Young`s modulus than the MA. As deformation moves into the plastic regime, the TT material displays a two stage hardening process. This consists of a low workhardening rate (n = 0.05), followed by a transition to the more normal workhardening rate (n=0.35). The MA material, on the other hand, does not exhibit the low n region. This unusual deformation behavior is attributable to the presence of planar slip which initiates at the grain boundary over the strain range of 0.2 to 0.7%. These observations are useful to explain the unexpectedly fast strain relaxation behavior seen in this alloy. The recovery kinetics of the alloy have also been studied. Rapid recovery with an activation energy of approximately 5.3 kj/mol occurs whenmore » the deformation level is low. This was attributed to a grain boundary self diffusion process. At higher strain levels, recovery is much slower with an activation energy of approximately 14 kJ/mol. This process was attributable to bulk diffusion. Based on TEM and X-ray rocking curve measurements, these results have been explained.« less

Authors:
; ;  [1]
  1. Rutgers--the State Univ., Piscataway, NJ (United States). Dept. of Mechanics and Materials Science
Publication Date:
Research Org.:
Electric Power Research Inst., Palo Alto, CA (United States); Rutgers-the State Univ., Piscataway, NJ (United States). Dept. of Mechanics and Materials Science
Sponsoring Org.:
Electric Power Research Inst., Palo Alto, CA (United States)
OSTI Identifier:
10175151
Report Number(s):
EPRI-TR-100910
ON: UN92040172
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Jul 1992
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 36 MATERIALS SCIENCE; NICKEL BASE ALLOYS; TENSILE PROPERTIES; STEAM GENERATORS; TUBES; PWR TYPE REACTORS; REACTOR MATERIALS; DEFORMATION; STRAINS; CRACKS; RESIDUAL STRESSES; STRESS ANALYSIS; COMPUTERIZED SIMULATION; GRAIN SIZE; CARBON ADDITIONS; 210200; 360103; POWER REACTORS, NONBREEDING, LIGHT-WATER MODERATED, NONBOILING WATER COOLED; MECHANICAL PROPERTIES

Citation Formats

Lo, C F, Mayo, W E, and Weissmann, S. Tensile deformation and recovery kinetics of Alloy 690. Final report. United States: N. p., 1992. Web.
Lo, C F, Mayo, W E, & Weissmann, S. Tensile deformation and recovery kinetics of Alloy 690. Final report. United States.
Lo, C F, Mayo, W E, and Weissmann, S. 1992. "Tensile deformation and recovery kinetics of Alloy 690. Final report". United States.
@article{osti_10175151,
title = {Tensile deformation and recovery kinetics of Alloy 690. Final report},
author = {Lo, C F and Mayo, W E and Weissmann, S},
abstractNote = {The effect of carbon content, grain size and thermal history on the deformation behavior of nickel-base Alloy 690 has been investigated. Carbon content effects the yield strength of Mill Annealed (MA) material, but has no effect in Thermally Treated (TT) material. Also, no effect of carbon content on the workhardening rate was seen in either material. There was an effect of grain size as expected. An interesting aspect of this work showed that TT material consistently has a slightly higher Young`s modulus than the MA. As deformation moves into the plastic regime, the TT material displays a two stage hardening process. This consists of a low workhardening rate (n = 0.05), followed by a transition to the more normal workhardening rate (n=0.35). The MA material, on the other hand, does not exhibit the low n region. This unusual deformation behavior is attributable to the presence of planar slip which initiates at the grain boundary over the strain range of 0.2 to 0.7%. These observations are useful to explain the unexpectedly fast strain relaxation behavior seen in this alloy. The recovery kinetics of the alloy have also been studied. Rapid recovery with an activation energy of approximately 5.3 kj/mol occurs when the deformation level is low. This was attributed to a grain boundary self diffusion process. At higher strain levels, recovery is much slower with an activation energy of approximately 14 kJ/mol. This process was attributable to bulk diffusion. Based on TEM and X-ray rocking curve measurements, these results have been explained.},
doi = {},
url = {https://www.osti.gov/biblio/10175151}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jul 01 00:00:00 EDT 1992},
month = {Wed Jul 01 00:00:00 EDT 1992}
}

Technical Report:
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