International Symposium on Environmental Damage Under Static and Cyclic Loads in Structural Metallic Materials at Ambient Temperatures III (Bergamo, Italy, June 15–20, 2014)
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A.K. Vasudevan
The field of stress corrosion cracking (SCC) has made significant progress in terms of mechanistic interpretations. Two main mechanisms have emerged: localized anodic electrochemical processes, such as dissolution or film formation, and the adsorption of specific embrittling species. With the advent of new techniques in instrumentation to measure crack tip chemistry, fractography using SEM, crack tip microscopic examination using high-resolution TEM, atomic probe microscopy for chemical analysis at atomic level, etc., new insights into the understanding of SCC have emerged. Despite these advances, there continues to be a need for systematic experiments with environmental concentration, more insights into mechanistic analysis, and a method of quantification for component life prediction. Since divergent materials are studied in various environments, there appears to be a generic behavior that is common for all, involving a well-defined SCC threshold, initial rapid crack growth, observable steady state in crack growth rates, followed by overload fracture. This observation is true for metals, alloys, ceramics, polymers, and composites in aqueous, gaseous, liquid metal environments, with internal or external embrittling elements. In addition, there is also a need for an integrated approach for the prediction of the material response in smooth, uniformly loaded specimens to notched specimens to pre-crack specimens in damaging environments under external static and cyclic loads.
This symposium series attempts to bring to focus our understanding of the generic principles involved in SCC. It covers modeling from the first principle calculations at an atomic level to material behavior at a continuum level. In particular, the symposium covers several areas including (a) principles underlying the SCC mechanisms for crack nucleation, crack propagation and factors that influence them, (b) modeling of kinetics of the crack-tip chemical reactions, the role of microstructure involving grain boundary precipitates (anodic or cathodic relative to the matrix), slip mode, yield stress, etc., (c) the kinetics of liquid metal embrittlement, and the associated slip activity, (d) first principle study of inter-atomic forces involving hydrogen in metals, (e) atomic force microscopy and fractographic details of crack growth, (f) TEM analysis of grain boundary structure and interaction of damaging environment with stress, (g) types of corrosion like pitting corrosion, crevice corrosion and the effect of alloying in dissolution or its prevention, (h) continuum modeling using cohesive zone concept, (i) SCC in several engineering alloys like 7075, 4340, x465 stainless steel, etc. The overall purpose of the conference is an attempt to bridge the gap between the damage kinetics for engineering materials exposed to real service environments and the coupon tests in the laboratory in controlled environments. The conference includes invited papers from internationally recognized authors for their contribution in the field of life prediction.
The third symposium was held in June of 2014 in Bergamo, Italy, to bring experts in the field together to discuss the issues and challenges in this field. The symposium was designed with a single session format. It was based on the understanding of environmental-assisted cracking in structural metallic materials with a focus on “how environment affects the crack driving force”. The symposium had a good mixture of experimental, theoretical, and computational modeling presentations. The attendees were from about 14 countries.
We thank the invited speakers, all the participants for their excellent contribution to the success of the symposium. We acknowledge a large number of referees for their timely submission of quality reviews. We thank the Editorial Board of the journal Corrosion Reviews and, in particular, Dr. Gunda Stöber for helping with the review of the manuscripts. We also extend our appreciation to the members of ECI International Symposium Organizers: Ms. Barbara Hickernell and Dr. Dean Miller. The next symposium is to be held in Cork, Ireland, in early June of 2016.
Symposium organizers:
A. K. Vasudevan, TDA, Inc, Falls Church, VA, USA
N. R. Moody, Sandia National Labs., Livermore, CA, USA
N. J. H. Holroyd, Luxfer Gas Cylinders, Riverside, CA, USA
R. M. Latanision, Exponent, Boston, MA, USA
©2015 by De Gruyter
Artikel in diesem Heft
- Frontmatter
- In this issue
- Editorial
- International Symposium on Environmental Damage Under Static and Cyclic Loads in Structural Metallic Materials at Ambient Temperatures III (Bergamo, Italy, June 15–20, 2014)
- Overviews and reviews
- U.S. Naval Aviation: operational airframe experience with combined environmental and mechanical loading
- Thirty-five years in environmentally assisted cracking in Italy: a point of view
- Fatigue and corrosion fatigue
- Transgranular corrosion fatigue crack growth in age-hardened Al-Zn-Mg (-Cu) alloys
- Effect of cyclic frequency on fracture mode transitions during corrosion fatigue cracking of an Al-Zn-Mg-Cu alloy
- Crack growth behavior of 4340 steel under corrosion and corrosion fatigue conditions
- Modeling of environmentally assisted fatigue crack growth behavior
- Factors influencing embrittlement and environmental fracture
- Pre-exposure embrittlement of an Al-Cu-Mg alloy, AA2024-T351
- Electrochemical approach to repassivation kinetics of Al alloys: gaining insight into environmentally assisted cracking
- Localized dissolution of grain boundary T1 precipitates in Al-3Cu-2Li
- Grain boundary anodic phases affecting environmental damage
- Defect tolerance under environmentally assisted cracking conditions
- Role of Mo/V carbides in hydrogen embrittlement of tempered martensitic steel
- Stress corrosion cracking
- The role of crack branching in stress corrosion cracking of aluminium alloys
- An atomistically informed energy-based theory of environmentally assisted failure
- Discrete dislocation modeling of stress corrosion cracking in an iron
- Quasi-static behavior of notched Ti-6Al-4V specimens in water-methanol solution
- Role of excessive vacancies in transgranular stress corrosion cracking of pure copper
- Multiscale investigation of stress-corrosion crack propagation mechanisms in oxide glasses
- Hydrogen assisted cracking
- Hydrogen effects on fracture of high-strength steels with different micro-alloying
- Environmentally assisted cracking and hydrogen diffusion in traditional and high-strength pipeline steels
- Multiscale thermodynamic analysis on hydrogen-induced intergranular cracking in an alloy steel with segregated solutes
Artikel in diesem Heft
- Frontmatter
- In this issue
- Editorial
- International Symposium on Environmental Damage Under Static and Cyclic Loads in Structural Metallic Materials at Ambient Temperatures III (Bergamo, Italy, June 15–20, 2014)
- Overviews and reviews
- U.S. Naval Aviation: operational airframe experience with combined environmental and mechanical loading
- Thirty-five years in environmentally assisted cracking in Italy: a point of view
- Fatigue and corrosion fatigue
- Transgranular corrosion fatigue crack growth in age-hardened Al-Zn-Mg (-Cu) alloys
- Effect of cyclic frequency on fracture mode transitions during corrosion fatigue cracking of an Al-Zn-Mg-Cu alloy
- Crack growth behavior of 4340 steel under corrosion and corrosion fatigue conditions
- Modeling of environmentally assisted fatigue crack growth behavior
- Factors influencing embrittlement and environmental fracture
- Pre-exposure embrittlement of an Al-Cu-Mg alloy, AA2024-T351
- Electrochemical approach to repassivation kinetics of Al alloys: gaining insight into environmentally assisted cracking
- Localized dissolution of grain boundary T1 precipitates in Al-3Cu-2Li
- Grain boundary anodic phases affecting environmental damage
- Defect tolerance under environmentally assisted cracking conditions
- Role of Mo/V carbides in hydrogen embrittlement of tempered martensitic steel
- Stress corrosion cracking
- The role of crack branching in stress corrosion cracking of aluminium alloys
- An atomistically informed energy-based theory of environmentally assisted failure
- Discrete dislocation modeling of stress corrosion cracking in an iron
- Quasi-static behavior of notched Ti-6Al-4V specimens in water-methanol solution
- Role of excessive vacancies in transgranular stress corrosion cracking of pure copper
- Multiscale investigation of stress-corrosion crack propagation mechanisms in oxide glasses
- Hydrogen assisted cracking
- Hydrogen effects on fracture of high-strength steels with different micro-alloying
- Environmentally assisted cracking and hydrogen diffusion in traditional and high-strength pipeline steels
- Multiscale thermodynamic analysis on hydrogen-induced intergranular cracking in an alloy steel with segregated solutes
