Effect of High Dislocation Density on Stress Corrosion Cracking and Hydrogen Embrittlement of Type 304L Stainless Steel

Louthan, McIntyre R.; Donovan, James; Rawl, D.E.

doi:10.5006/0010-9312-29.3.108

Cited by 22 publications

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“…As we all know, dislocation loops, defects as well as voids can be formed on the surface layer of F-M steels after irradiation by neutrons, protons and so on [1,8,30]. These defects may change the corrosion behavior of F-M steels in SCW because defects have been confirmed to affect the corrosion behavior of materials under different environments [39][40][41].…”

Section: Discussionmentioning

confidence: 99%

Oxidation behavior of an 11Cr ferritic–martensitic steel after Ar-ions irradiation in supercritical water

Huang

Shen

2015

Journal of Nuclear Materials

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Section: Discussionmentioning

confidence: 99%

Oxidation behavior of an 11Cr ferritic–martensitic steel after Ar-ions irradiation in supercritical water

Huang

Shen

2015

Journal of Nuclear Materials

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“…While the primary purpose of surface treatment is to form a compressively stressed sub-surface layer, its actual impact on part microstructure and properties is often more significant. [13,14] The most predominant of these effects is plastic deformation of the surface and near-surface regions, which can increase dislocation density and strain-harden the material, altering the mechanical [15,16] and electrochemical behavior [17][18][19] of Inconel 718 alloys.…”

Section: Introductionmentioning

confidence: 99%

Inhomogeneous Strains and Dislocation Evolution in Surface-Treated Ni-Base Superalloys

Shukla¹,

Lim

Dong

2020

Metall Mater Trans A

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Surface treatment processes such as shot-peening create near-surface residual stresses in the component, which retard the initiation and growth of fatigue cracks. These processes, however, also induce considerable amount of strain hardening and alter the sub-surface dislocation structure of the material, which can impact its mechanical and electrochemical properties. Although these effects are critical for part performance, they have not so far been studied for surface-treated Ni-base superalloys, which are widely used for load-bearing applications. To address this, we have developed an X-ray diffraction (XRD) framework based on Convolutional Multiple Whole Profile (CMWP) fitting approach that can be used to quantify dislocation densities in shot-peened Inconel 718 components. The method exploits physics-based mechanisms for size and strain broadening to model these effects and uses dislocation contrast factors to account for deformation-induced crystallographic anisotropy in the diffraction profile. Our results suggest that shot-peening leads to one order of magnitude increase in the dislocation density of Inconel 718 alloys, which is supported by direct evidence from transmission electron micrographs. The approach developed in this work can be extended to other types of Ni-base superalloys, enabling a simple non-destructive method to calculate dislocation densities in this commercially important class of materials.

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The Role of Metallurgical Variables in Hydrogen-Assisted Environmental Fracture

Thompson

Bernstein

1980

Advances in Corrosion Science and Technology

124

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INTRODUCTIONThis chapter focuses on two kinds of environmental fracture, stress corrosion cracking (SeC) and hydrogen embrittlement, and discusses the role in such failures of a number of metallurgical variables. These include chemical composition; microstructural components such as precipitate type and structure, and grain size and shape; crystallographic texture; heat treatment and its effect on the foregoing variables; and processing, particularly the thermo mechanical treatments (TMT), which are attracting increased attention for property optimization. These variables are expected to be of great importance in the development of new engineering materials to meet demanding service conditions.In recent years, understanding of the role of metallurgical variables in hydrogen embrittlement has improved significantly. One purpose of the present review is to summarize this progress. Since hydrogen is believed to be broadly involved in many environmental cracking phenomena, it is a second purpose of the review to extend that improved understanding to at least some cases of Sec. It might be expected that similar role(s) of metallurgical variables would be observed for both hydrogen embrittlement and hydrogenassisted see, particularly when hydrogen plays a dominant role.The usual definition of see is that both a corrosive environment and a tensile stress (residual or applied) act together to cause cracking, which has a macroscopically brittle appearance. It is implicit in this definition that see is a phenomenon, not a mechanism, and it is so treated in this chapter. Hydrogen embrittlement is also a phenomenon, which mayor may not occur during sec. Hydrogen as a gas or as a species evolved from chemical or electrochemical reactions could be regarded as an see corrodent. But since classical hydrogen embrittlement studies have been conducted with hydrogen dissolved within the metal, which corrodents usually are not, such studies have been cited in the past as evidence against a link between see and hydrogen embrittlement. This review concludes, as have others, that such a conclusion cannot be general. There are now known to be a number of cases in which hydrogen participates in see fracture, and the accepted balance between hydrogen cracking and, say, anodic dissolution as components of see appears to need reappraisal or revision. It is a purpose of this chapter to identify such areas.It should be strongly emphasized that we do not accept the proposition that there must be a single causative process for Sec. There are indeed instances of purely dissolution processes, or purely hydrogen embrittlement processes, giving rise to what is generally described as Sec. But in many cases there appear to be contributions from both types of processes. This chapter emphasizes the hydrogen-related behavior in order to make maximum use of the new understanding of hydrogen embrittlement, but that emphasis should not be construed as being a mechanistic emphasis.The combined literature record on see and hydrogen embrittlement is very exten...

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Effect of High Dislocation Density on Stress Corrosion Cracking and Hydrogen Embrittlement of Type 304L Stainless Steel

Cited by 22 publications

References 0 publications

Oxidation behavior of an 11Cr ferritic–martensitic steel after Ar-ions irradiation in supercritical water

Oxidation behavior of an 11Cr ferritic–martensitic steel after Ar-ions irradiation in supercritical water

Inhomogeneous Strains and Dislocation Evolution in Surface-Treated Ni-Base Superalloys

The Role of Metallurgical Variables in Hydrogen-Assisted Environmental Fracture

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