Mechanical behaviour of SSRT specimens optimized for IGSCC concerns

Deleume, Julien; Poquillon, Dominique; Garat, Véronique; Cloué, Jean‐Marc; Andrieu, Éric

doi:10.1016/j.corsci.2007.10.007

Cited by 15 publications

(15 citation statements)

References 9 publications

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“…Such localized corrosion along the grain boundaries may result in intergranular SCC in the presence of tensile stresses [18][19][20]. But in this case, the mode of fracture was not intergranular; rather it was transgranular which is attributed to chloride SCC [13,21] thus the sensitization was not a primary contributor to the failure process. Similar types of failure in austenitic stainless steels have also been experienced by several other researchers [22][23][24].…”

Section: Discussionmentioning

confidence: 97%

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Failure Analysis of AISI-304 Stainless Steel Styrene Storage Tank

Asghar

Tariq

Ali

2010

J Fail. Anal. and Preven.

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This paper presents the failure analysis of AISI-304 stainless steel tank that was fabricated by welding and used for the storage of styrene monomers. After about 13 years of satisfactory operation, significant cracking was observed adjacent to the weld joints and in base plate near tank foundation. Weld repair was by shielded gas arc welding using AISI 308 stainless steel filler wire. The failed base plate was replaced with the new AISI 304 base plate of same thickness. After a short period of time, seepage was observed along the weld bead. Upon nondestructive testing cracks were found in the heat-affected zone and in the base plate. The failure investigation was carried out on welded and base plate samples using spectroscopy, optical and scanning electron microscopy, fractography, SEM-EDS analysis, microhardness measurements, tensile and impact testing. The results revealed transgranular cracks in the HAZ and base plate, and the failure was attributed due to stress corrosion cracking. Cracks initiated as a result of combined action of stresses developed during welding and the presence of a chloride containing environment due to seawater. It was further observed that improper welding parameters were employed for weld repair which resulted in sensitization of the structure and postweld heat treatment to remove weld sensitization and minimize the residual stresses was not done.

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Section: Discussionmentioning

confidence: 97%

“…8(d). Transgranular fracture morphology is typical of chloride SCC and sensitized structure [13,21,27] as already discussed in preceding paragraphs.…”

Section: Discussionmentioning

confidence: 97%

Failure Analysis of AISI-304 Stainless Steel Styrene Storage Tank

Asghar

Tariq

Ali

2010

J Fail. Anal. and Preven.

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“…Such geometry has two main advantages for crack initiation concerns. On the one hand, it enables to both control the strain rate and the extent of the volume at the apex of the V submitted to that imposed strain rate [13]. As a result, required loading conditions for SCC initiation are only fulfilled locally, at the apex of the V, hence the control of the localization of potential crack initiation site.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…The second is that, up to now, there is no known SCC test capable of quantitatively accounting for this generic resistance to initiation. Recent work [13] has enabled to define, validate and model a slow strain rate (SSRT) test dedicated to the study of SCC initiation. It has necessitated the use of specific V-shaped tensile specimens.…”

Section: Introductionmentioning

confidence: 99%

Influence of δ phase precipitation on the stress corrosion cracking resistance of alloy 718 in PWR primary water

Deleume

Cloué

Andrieu

2008

Journal of Nuclear Materials

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“…[1,2] and enabled stressing of the sample surface. It has already been used on nickel based alloys [3,4] to get a better understanding of crack initiation. Flat geometry has been tested for three strain rates (10 −3 s −1 , 1.25 10 −4 s −1 and 1.25 10 −5 s −1 ), minimum value possible on the experimental device) and two temperature (600…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Strain rate and temperature effects on crack initiation of direct aged 718 Alloy

Perrais

Burteau²,

Seror³

et al. 2014

MATEC Web of Conferences

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Abstract. During mechanical tests at high temperature in an oxidizing atmosphere, the effects of strain rate on crack initiation are noticeable. This effect is due to a coupling between local mechanical loading and oxidation. Samples were machined in a turbine disk made of direct aged alloy 718. Tests were performed to understand the effect of these couplings on crack initiation and to ensure lifetime is optimized. This study compared the cracking resistance of two different specimen geometries at a given plastic strain and performed quantitative measurement of the mechanical loading conditions inducing crack initiation between 600• C and 650• C. Sample geometries consisted in tensile flat specimens and V-shaped samples. This specific geometry was used to localize strain and damage in the apex of the V and to reach strain rates lower than those possible on standard specimens. Digital image correlation technique was used to provide strain measurements. For each temperature and strain rate, finite element calculations using the identified constitutive law were performed to get a refined level of strain in different areas at the V apex. Tests were stopped after an imposed displacement corresponding to a given plastic strain distribution. SEM observations of the surface of the flat tensile samples revealed no crack initiation. On the contrary, SEM observations at the apex of V specimens for which the level of cumulative strain was close to the level of cumulative strain of flat samples reveal the presence of intergranular damage when the strain rate used was below a given level.

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Mechanical behaviour of SSRT specimens optimized for IGSCC concerns

Abstract: OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.

Cited by 15 publications

References 9 publications

Failure Analysis of AISI-304 Stainless Steel Styrene Storage Tank

Failure Analysis of AISI-304 Stainless Steel Styrene Storage Tank

Influence of δ phase precipitation on the stress corrosion cracking resistance of alloy 718 in PWR primary water

Strain rate and temperature effects on crack initiation of direct aged 718 Alloy

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