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Title: Correlation of Yield Stress and Microhardness in 08Cr16Ni11Mo3 Stainless Steel Irradiated to High Dose in the BN-350 Fast Reactor

Abstract

The relationship between the microhardness and the engineering yield stress in 08Cr16Ni11Mo3 steel after irradiation in the BN-350 reactor has been experimentally derived and agrees with a previously published correlation developed by Toloczko for unirradiated 316 in a variety of cold-work conditions. Even more importantly, when the correlation is derived in the K? format where the correlation involves changes in the two properties, excellent agreement is found with a universal K? correlation developed by Busby and coworkers. Additionally, this report points out that microhardness measurements must take into account that sodium exposure at high temperature alters the metal surface to produce ferrite, and therefore the altered layers should be removed prior to testing.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
898628
Report Number(s):
PNNL-SA-50939
AT6020100; TRN: US0701686
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials, 359(3):258-262
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; BN-350 REACTOR; FAST REACTORS; FERRITE; IRRADIATION; MICROHARDNESS; SODIUM; STAINLESS STEELS; STEELS; TESTING

Citation Formats

Gusev, M. N., Maksimkin, O. P., Tivanova, O. V., Silnaygina, N. S., and Garner, Francis A. Correlation of Yield Stress and Microhardness in 08Cr16Ni11Mo3 Stainless Steel Irradiated to High Dose in the BN-350 Fast Reactor. United States: N. p., 2006. Web. doi:10.1016/j.jnucmat.2006.09.005.
Gusev, M. N., Maksimkin, O. P., Tivanova, O. V., Silnaygina, N. S., & Garner, Francis A. Correlation of Yield Stress and Microhardness in 08Cr16Ni11Mo3 Stainless Steel Irradiated to High Dose in the BN-350 Fast Reactor. United States. doi:10.1016/j.jnucmat.2006.09.005.
Gusev, M. N., Maksimkin, O. P., Tivanova, O. V., Silnaygina, N. S., and Garner, Francis A. Fri . "Correlation of Yield Stress and Microhardness in 08Cr16Ni11Mo3 Stainless Steel Irradiated to High Dose in the BN-350 Fast Reactor". United States. doi:10.1016/j.jnucmat.2006.09.005.
@article{osti_898628,
title = {Correlation of Yield Stress and Microhardness in 08Cr16Ni11Mo3 Stainless Steel Irradiated to High Dose in the BN-350 Fast Reactor},
author = {Gusev, M. N. and Maksimkin, O. P. and Tivanova, O. V. and Silnaygina, N. S. and Garner, Francis A.},
abstractNote = {The relationship between the microhardness and the engineering yield stress in 08Cr16Ni11Mo3 steel after irradiation in the BN-350 reactor has been experimentally derived and agrees with a previously published correlation developed by Toloczko for unirradiated 316 in a variety of cold-work conditions. Even more importantly, when the correlation is derived in the K? format where the correlation involves changes in the two properties, excellent agreement is found with a universal K? correlation developed by Busby and coworkers. Additionally, this report points out that microhardness measurements must take into account that sodium exposure at high temperature alters the metal surface to produce ferrite, and therefore the altered layers should be removed prior to testing.},
doi = {10.1016/j.jnucmat.2006.09.005},
journal = {Journal of Nuclear Materials, 359(3):258-262},
number = ,
volume = ,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2006},
month = {Fri Dec 15 00:00:00 EST 2006}
}
  • The relationship between values of the microhardness Н and the engineering yield stress, 02, in steel 08Cr16Ni11Mo3 (Russian analog of AISI 316) heavily irradiated in the BN-350 reactor has been experimentally derived. It agrees very well with the previously published correlation developed by Toloczko for unirradiated 316 in a variety of cold-work conditions. Even more importantly, when the correlation is derived in the KΔ format where the correlation involves changes in the two properties, we find excellent agreement with a universal KΔ correlation developed by Busby and coworkers. With this KΔ correlation, one can predict the value of yield stressmore » in irradiated material based on measured values of microhardness. The technique is particularly suitable when the material of interest is in an inconvenient location or configuration, or when significant gradients in mechanical properties are anticipated over small dimensions. This approach makes it possible to reduce the labor input and risk when conducting such work. It appears that the derived correlation is equally applicable to both Russian and Western austenitic steel, and also in both irradiated and unirradiated conditions. Additionally, this report points out that microhardness measurements must take into account that high temperature sodium exposure alters the metal surface to produce ferrite, and therefore the altered layers should be removed prior to testing.« less
  • In several recently published studies conducted on a Soviet analog of AISI 321 stainless steel irradiated in either fast reactors or light water reactors, it was shown that the void swelling phenomenon extended to temperatures as low as ~300ºC or less, when produced by neutron irradiation at dpa rates in the range 10-7 to 10-8 dpa/sec. Other studies yielded similar results for AISI 316 and the Russian analog of AISI 316. In the current study a blanket duct assembly from BN-350, constructed from the Soviet analog of AISI 321, also exhibits swelling at dpa rates on the order of 10-8more » dpa/sec, with voids seen as low as 281C and only 0.65 dpa. It appears that low-temperature swelling occurs at low dpa rates in 300 series stainless steels in general, and also occurs during irradiations conducted in either fast or in mixed spectrum reactors as shown in other studies.« less
  • In several recently published studies conducted on a Soviet analog of AISI 321 stainless steel irradiated in either fast reactors or light water reactors, it was shown that the void swelling phenomenon extended to temperatures as low as ~300ºC or less, when produced by neutron irradiation at dpa rates in the range 10-7 to 10-8 dpa/sec. Other studies yielded similar results for AISI 316 and the Russian analog of AISI 316. In the current study a blanket duct assembly from BN-350, constructed from the Soviet analog of AISI 321, also exhibits swelling at dpa rates on the order of 10-8more » dpa/sec, with voids seen as low as 281oC and only 0.65 dpa. It appears that low-temperature swelling occurs at low dpa rates in 300 series stainless steels in general, and also occurs during irradiations conducted in either fast or mixed spectrum reactors. Therefore it is expected that a similar behavior will be observed in fusion devices as well.« less
  • In several recently published studies conducted on a Soviet analog of AISI 321 stainless steel irradiated in either fast reactors or light water reactors, it was shown that the void swelling phenomenon extended to temperatures as low as {approx} 300 C, when produced by neutron irradiation at dpa rates in the range 10(-7 power) to 10(-8 power) dpa/sec. Other studies yielded similar results for AISI 316. In the current study a blanket duct assembly from BN-350, constructed from the Soviet analog of AISI 316, also exhibits swelling at dpa rates on the order of 10(-8 power) dpa/sec, with voids seenmore » as low as 281 C and only 1.3 dpa. It appears that low-temperature swelling at low dpa rates occurs in 300 series stainless steels in general, and during irradiations conducted in either fast or mixed spectrum reactors.« less
  • Data on change in yield strength of SA 316 stainless steel irradiated with 14-MeV, Be(d,n) and fission reactor neutrons do not correlate with respect to damage energy. The data suggest possible temperature or additional spectral effects. A simple defect production function, based on the production of lobes in computer simulated cascades, correlates the data much better than damage energy.