Stress corrosion cracking (SCC) and hydrogen-assisted cracking in titanium alloys

Chattoraj, I

doi:10.1533/9780857093769.3.381

Cited by 13 publications

(6 citation statements)

References 59 publications

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“…The proposed reaction chemistry behind the HSSCC NaCl mechanism is described within [11], as largely derived from interrogation of previous research [2,6,11,[33][34][35][36][37][38][39]. It is considered that the HSSCC mechanism generates a level of hydrogen-embrittlement [6,11,33,34,[37][38][39].…”

Section: Discussion -Mechanism and Chemistrymentioning

confidence: 99%

“…It is considered that the HSSCC mechanism generates a level of hydrogen-embrittlement [6,11,33,34,[37][38][39]. Very low levels of Ca, K (and trace Mg) in addition to Na/ Cl, combined with observational difficulty of corroded patches on specimens ST1 and ST2, suggest human contact (perspiration, fingerprints) might have initially caused contamination with ultimate fatigue initiation-life reduction.…”

Section: Discussion -Mechanism and Chemistrymentioning

confidence: 99%

“…In addition to this corrosion resistance, high fatigue strength to density ratios [1,3,4] have ensured titanium alloys have broad applications in aero-gas turbine engines [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Understanding the “blue spot”

Saunders

Chapman

Walker

et al. 2016

Engineering Failure Analysis

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During hot component fatigue tests there have been two cases of low life crack initiation of gas turbine rotating parts manufactured from the Titanium alloy Ti-6246. Both exhibited a small (~0,1mm) elliptical "blue spot" at the origin. Through validated striation count work and fracture mechanics it was established that fatigue had propagated with a near-nil initiation life. Early investigation suggested that the "blue spot" was possibly a region of stage 1 fatigue growth, and was therefore a material behaviour concern with potential implications for service. During an investigation of a later cracking incident in this alloy, subsequently shown to have resulted from Stress-corrosion cracking (SCC), near-identical fractographic characteristics to that seen in the "blue spot" were found that subtly differentiated it from stage 1 fatigue. Also, similar "blue spots" have since been identified on Ti6246 Laboratory hot LCF test specimens and found to have been due to contamination by NaCl, through the application of focussed long-term EDX examination and other novel chemical analyses techniques. By the application of those techniques, fractography, and comparison against these specimens, Rolls-Royce and Imperial College London have collaborated to show that the original two component "blue spots" were subtle examples of NaCl-related Hot Salt Stress-Corrosion Cracking (HSSCC). Such cracking has not been found to occur in service components, due to air pressure within the engine, and the effect is therefore confined to Laboratory and component tests at near-atmospheric pressure or below.

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Section: Discussion -Mechanism and Chemistrymentioning

confidence: 99%

Section: Discussion -Mechanism and Chemistrymentioning

confidence: 99%

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Understanding the “blue spot”

Saunders

Chapman

Walker

et al. 2016

Engineering Failure Analysis

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show abstract

“…However, the β phase exhibit higher strength potential through aging, leading to increased mechanical properties, better deformability, higher diffusivity for interstitial elements, isotopic properties, high density, and lower creek resistance compared to α phase. But generally, β phase of titanium is more expensive than α phase [16,17].…”

Section: Types Of Titanium Alloys Based On Equilibrium At Room Temper...mentioning

confidence: 99%

Mechanical Properties and Performance of Titanium-Based Alloys Used in Aerospace Applications

Mohammed Abdulrahman,

Mohshen Sharif Ullah Siddique,

Barnawi

2024

Titanium-Based Alloys - Characteristics and Applications

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This chapter in this book will focus on the mechanical properties, including strength, toughness, and fatigue resistance, of titanium-based alloys and their significance in aerospace applications. It will discuss several types of titanium alloys and explore the unique characteristics of these alloys, such as high strength-to-weight ratio, corrosion resistance, and excellent high-temperature performance. The chapter also will discuss specific challenges and considerations in designing and manufacturing components using titanium-based alloys for aerospace applications, highlighting the benefits and limitations of these materials. Additionally, it will provide case studies and examples of successful applications in the aerospace industry, showcasing the uniqueness and effectiveness of titanium-based alloys in this field.

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“…The following three conditions are essential to exist at the same time for the HIC or HE of Cp titanium alloys to occur: surface hydrogen generation, temperatures above approximately 80 °C, so that the hydrogen diffusion rate becomes significant, and solution pH <3 or >12, or impressed potentials <–0.7 V (SCE). 72…”

Section: Forms Of Hydrogen-induced Damagesmentioning

confidence: 99%

A critical appraisal of laser peening and its impact on hydrogen embrittlement of titanium alloys

Rajyalakshmi

Swaroop

2019

Proceedings of the Institution of Mechanical Engineers, Part B:

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Many efforts have been made to understand the effects of hydrogen on titanium alloys, resulting in an abundance of theoretical models and papers. Titanium alloys are crucial advanced materials that provide an excellent combination of a high strength-to-weight ratio and good corrosion behaviour even though they are reasonable to corrosion attack. Titanium alloys are susceptible to hydrogen embrittlement when comes into contact with hydrogen, and galvanic pair with an active metal current, or the pH is greater than 12 or less than 3 or an impressed current. In view of the fact that hydrogen behaves differently with α and β phases, hydrogen degradation may vary markedly in titanium alloys. Hydrogen diminishes the corrosion and erosion resistance and fatigue life of in-service titanium components. A laser peening or laser shock peening is a novel technique for making the metal surfaces and sub-layers densify. It evokes that laser shock peening adoption results in yielding and plastic deformation, thereby creating high compressive residual stresses extending below the surface of the material which is desirable for hydrogen embrittlement resistance and reduction of crack initiation and growth of the component. This article is a review of information relating hydrogen embrittlement of titanium alloys and surface modification technique which influence the strength potential of titanium alloys.

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Stress corrosion cracking (SCC) and hydrogen-assisted cracking in titanium alloys

Cited by 13 publications

References 59 publications

Understanding the “blue spot”

Understanding the “blue spot”

Mechanical Properties and Performance of Titanium-Based Alloys Used in Aerospace Applications

A critical appraisal of laser peening and its impact on hydrogen embrittlement of titanium alloys

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