ESEM observations of SCC initiation for 4340 high strength steel in distilled water
Atrens, A; Wang, ZF
Corresponding AuthorAtrens, A()
AbstractThe stress corrosion cracking (SCC) initiation process for 4340 high strength steel in distilled water at room temperature was studied using a new kind of instrument: an environmental scanning electron microscope (ESEM). It was found that the applied stress accelerated oxide film formation which has an important influence on the subsequent SCC initiation. SCC was observed to initiate in the following circumstances: (1) cracking of a thick oxide film leading to SCC initiation along metal grain boundaries, (2) the initiation of pits initiating SCC in the metal and (3) SCC initiating from the edge of the specimen. All these three SCC initiation circumstances are consistent with the following model which couples SCC initiation with cracking of a surface protective oxide. There is a dynamic interaction between oxide formation, the applied stress, oxide cracking, pitting and the initiation of SCC. An aspect of the dynamic interaction is cracks forming in a protective surface oxide because of the applied stress, exposing to the water bare metal at the oxide crack tip, and oxidation of the bare metal causing crack healing. Oxide crack healing would be competing with the initiation of intergranular SCC if an oxide crack meets the metal surface at a grain boundary. If the intergranular SCC penetration is sufficiently fast along the metal grain boundary, then the crack yaws open preventing healing of the oxide crack. If intergranular SCC penetration is not sufficiently fast, then the oxidation process could produce sufficient oxide to fill both the stress corrosion crack and the oxide crack; in this case there would be initiation of SCC but only limited propagation of SCC. Stress-induced cracks in very thin oxide can induce pits which initiate SCC, and under some conditions such stress induced cracks in a thin oxide can directly initiate SCC.
Indexed BySCI
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
WOS IDWOS:000071337900015
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Cited Times:26[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorAtrens, A
Affiliation1.Univ Queensland, Dept Min Minerals & Mat Engn, Brisbane, Qld 4072, Australia
2.Chinese Acad Sci, Inst Corros & Protect Met, State Key Lab Cooros Sci, Shenyang 110015, Peoples R China
Recommended Citation
GB/T 7714
Atrens, A,Wang, ZF. ESEM observations of SCC initiation for 4340 high strength steel in distilled water[J]. JOURNAL OF MATERIALS SCIENCE,1998,33(2):405-415.
APA Atrens, A,&Wang, ZF.(1998).ESEM observations of SCC initiation for 4340 high strength steel in distilled water.JOURNAL OF MATERIALS SCIENCE,33(2),405-415.
MLA Atrens, A,et al."ESEM observations of SCC initiation for 4340 high strength steel in distilled water".JOURNAL OF MATERIALS SCIENCE 33.2(1998):405-415.
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