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Title: Propagation of stress corrosion cracks in alpha-brasses

Abstract

Transgranular and intergranular stress corrosion cracks were investigated in alpha-brasses in a tarnishing ammoniacal solution. Surface observation indicated that the transgranular cracks propagated discontinuously by the sudden appearance of a fine crack extending several microns ahead of the previous crack tip, often associated with the detection of a discrete acoustic emission (AE). By periodically increasing the deflection, crack front markings were produced on the resulting fracture surfaces, showing that the discontinuous propagation of the crack trace was representative of the subsurface cracking. The intergranular crack trace appeared to propagate continuously at a relatively blunt crack tip and was not associated with discrete AE. Under load pulsing tests with a time between pulses, Δt greater than or equal to 3 s, the transgranular fracture surfaces always exhibited crack front markings which corresponded with the applied pulses. The spacing between crack front markings, Δx, decreased linearly with Δt. With Δt less than or equal to 1.5 s, the crack front markings were in a one-to-one correspondence with applied pulses only at relatively long crack lengths. In this case, Δx = Δx* which approached a limiting value of 1 μm. No crack front markings were observed on intergranular fracture surfaces produced during thesemore » tests. It is concluded that transgranular cracking occurs by discontinuous mechanical fracture of an embrittled region around the crack tip, while intergranular cracking results from a different mechanism with cracking occurring via the film-rupture mechanism.« less

Authors:
 [1]
  1. Univ. of Illinois, Urbana-Champaign, IL (United States)
Publication Date:
Research Org.:
Univ. of Illinois, Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
7084372
Report Number(s):
DOE/ER/01198-1328
DOE Contract Number:  
AC02-76ER01198
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BRASS-ALPHA; STRESS CORROSION; AMMONIA; AQUEOUS SOLUTIONS; CRACKS; DYNAMIC LOADS; INTERGRANULAR CORROSION; PULSES; SOUND WAVES; SURFACES; ALLOYS; BRASS; CHEMICAL REACTIONS; COPPER ALLOYS; COPPER BASE ALLOYS; CORROSION; DISPERSIONS; HYDRIDES; HYDROGEN COMPOUNDS; MIXTURES; NITROGEN COMPOUNDS; NITROGEN HYDRIDES; SOLUTIONS; ZINC ALLOYS; 360105* - Metals & Alloys- Corrosion & Erosion

Citation Formats

Beggs, Dennis Vinton. Propagation of stress corrosion cracks in alpha-brasses. United States: N. p., 1981. Web. doi:10.2172/7084372.
Beggs, Dennis Vinton. Propagation of stress corrosion cracks in alpha-brasses. United States. https://doi.org/10.2172/7084372
Beggs, Dennis Vinton. 1981. "Propagation of stress corrosion cracks in alpha-brasses". United States. https://doi.org/10.2172/7084372. https://www.osti.gov/servlets/purl/7084372.
@article{osti_7084372,
title = {Propagation of stress corrosion cracks in alpha-brasses},
author = {Beggs, Dennis Vinton},
abstractNote = {Transgranular and intergranular stress corrosion cracks were investigated in alpha-brasses in a tarnishing ammoniacal solution. Surface observation indicated that the transgranular cracks propagated discontinuously by the sudden appearance of a fine crack extending several microns ahead of the previous crack tip, often associated with the detection of a discrete acoustic emission (AE). By periodically increasing the deflection, crack front markings were produced on the resulting fracture surfaces, showing that the discontinuous propagation of the crack trace was representative of the subsurface cracking. The intergranular crack trace appeared to propagate continuously at a relatively blunt crack tip and was not associated with discrete AE. Under load pulsing tests with a time between pulses, Δt greater than or equal to 3 s, the transgranular fracture surfaces always exhibited crack front markings which corresponded with the applied pulses. The spacing between crack front markings, Δx, decreased linearly with Δt. With Δt less than or equal to 1.5 s, the crack front markings were in a one-to-one correspondence with applied pulses only at relatively long crack lengths. In this case, Δx = Δx* which approached a limiting value of 1 μm. No crack front markings were observed on intergranular fracture surfaces produced during these tests. It is concluded that transgranular cracking occurs by discontinuous mechanical fracture of an embrittled region around the crack tip, while intergranular cracking results from a different mechanism with cracking occurring via the film-rupture mechanism.},
doi = {10.2172/7084372},
url = {https://www.osti.gov/biblio/7084372}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1981},
month = {1}
}

Thesis/Dissertation:
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