Residual stress analysis in the oxide scale/metal substrate system due to oxidation growth strain and creep deformation

Ruan, J.L.; Pei, Yongmao; Fang, Daining

doi:10.1007/s00707-012-0739-4

Cited by 37 publications

(10 citation statements)

References 40 publications

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“…The existing of stresses is the most important reason to ruin oxide scales and lose the oxidation resistance, so it greatly influenced on the life of superalloys in service. For a long time, researchers all over the world studied a lot for oxide scale stresses, many creative techniques were developed, among which pulling test [1-3], X-ray diffraction [4][5][6], and Raman spectroscopy [7][8][9] were the typical ones, making great efforts to study the generating mechanism of stresses and evaluate the protecting life of oxide scales for superalloys.…”

Section: Introductionmentioning

confidence: 99%

Real Time Test in situ of Superalloy Oxide Scale Stress by Archimedes Curve Slice Moment Technique

Wang¹,

Zheng²,

Yu³

2017

Metallofiz. Noveishie Tekhnol.

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Stress is the direct cause of surface oxide scale exfoliation to ruin the protection for alloy matrix. Therefore, it is the key to study oxide scale mechanical behaviour for discovering the oxidation resistance of alloys. In this paper, a new kind of experimental method 'Archimedes curve slice moment technique' is studied to test in situ the real time oxide scale stress of ferro-based superalloy K273 during all the high-temperature oxidation. By the derived formula, the oxide scale stress  can be calculated precisely only by observing Archimedes curve slice real-time polar radius OC. Having been oxidated for 5 hours at 800C, the oxide scale stress versus oxidation time is regressed to follow parabola equation strictly. As the oxides grow and the inner new oxides form in scales to press each other, the oxide scale stress is generated. Analysed by SEM, EDS and XRD, the oxide scale is compact composite structure made up of Cr 2 O 3 and spinel (Fe, Ni, Mn)Cr 2 O 4 . The less oxide scale stress increment brings about the lower oxidation weight gain rate and the better oxidation resistance. Improved by the use of vacuum system, the Archimedes curve slice moment technique is going to test the oxide scale growing and thermal stresses qualitatively and quantitatively in situ all the time at high temperature.Key words: ferro-based superalloy, oxide scale stress, oxidation resistance, Ключові слова: суперстоп на основі заліза, напруження, що виникають через циндру, стійкість до окиснення, Архімедова крива.Напряжения являются непосредственной причиной отслоения припо-верхностной окалины, что приводит к разрушению защиты матрицы сплава. Следовательно, изучение механического поведения окалины яв-ляется ключом к выяснению стойкости сплавов к окислению. В данной работе рассматривается новая экспериментальная методика измерения скручивающего момента для тонкого слоя материала, вырезанного по кривой Архимеда, служащая для in situ изучения в режиме реального времени напряжений, возникающих за счёт окалины, в суперсплаве на основе железа K273 в течение всего высокотемпературного окисления. Согласно полученному выражению, для точного расчёта в режиме реаль-ного времени напряжений , возникающих из-за окалины, достаточно лишь наблюдения за полярным радиусом OC образца, вырезанного по кривой Архимеда. При исследовании процесса окисления на протяжении 5 часов при температуре 800C зависимость напряжений из-за окалины от времени окисления была сведена к уравнению параболы. По мере роста оксида и формирования новых внутренних его слоёв, давящих друг на друга, генерируются напряжения за счёт окалины. Анализ, проведённый методами СЭМ, ЭРС и РДА, показал, что окалина уплотняется в компо-зитную структуру, состоящую из Cr 2 O 3 и шпинели (Fe, Ni, Mn)Cr 2 O 4 . REAL TIME TEST IN SITU OF SUPERALLOY OXIDE SCALE STRESS 1637Уменьшение напряжений, возникающих за счёт окалины, приводит к более низкой скорости окисления и повышению стойкости к окислению. Улучшенная использованием вакуумной системы методика in situ изме-рения скручивающего момента...

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Section: Introductionmentioning

confidence: 99%

Real Time Test in situ of Superalloy Oxide Scale Stress by Archimedes Curve Slice Moment Technique

Wang¹,

Zheng²,

Yu³

2017

Metallofiz. Noveishie Tekhnol.

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“…Li developed both sides oxidation technique with no protecting coatings to test oxide scale stress [3]. Meanwhile, X ray diffraction [4,5] and laser Raman spectroscopy [6,7] were deeply used in oxide scale testing. Though both of them detected the oxide scale stress indirectly with many uncertain factors and limitations, such as X-ray diffraction peak drifting, material purity, laser penetrability etc, they had widened view of researchers broadly, and laid solid foundation for oxide scale stress study.…”

Section: Introductionmentioning

confidence: 99%

The Study of Superalloy Oxide Scale Stress

Wang¹,

Zheng²

2017

dtmse

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Stress is the essential factor to cause surface oxide scale exfoliation to lose oxidation resistance for superalloys. In this paper, a new kind of experimental technique, rectangle wedge slice moment method, was studied to test in situ the real time oxide scale stress of ferro based superalloy GH2036 during high temperature oxidation. Having been oxidated for 10 hours at 800°C, the oxide scale stress σ versus time t was regressed to follow the power function σ=179.1745t 0.0714 . The scale stress goes up with oxidation time, but its gain decreases, reducing the exfoliation tendency and benefitting the protecting. New born oxides growing at the interface of matrix and scales generate the oxide scale stress. More oxides bring thicker scales, bigger stress and higher oxidation resistance.

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“…Similar phenomena have been observed in the oxidation of some metals. 17 However, many studies [18][19][20][21] ignored the effect of stress on the chemical reaction and only considered the chemical reaction by the growth strain or growth stress. Therefore, stress and chemical reaction coupling effects must be considered to predict the stress evolution and the oxidation kinetics.…”

mentioning

confidence: 99%

“…At high temperature, stresses predicted by the elastic theory were over two orders of magnitude greater than the creep model for the FeCr alloy. 23 The creep model [18][19][20] is used when stress relaxation occurs due to high temperature oxidation. The plastic model 10 is used when the stress is over the elastic limit.…”

mentioning

confidence: 99%

General approach on chemistry and stress coupling effects during oxidation

Suo

Shen

2013

Journal of Applied Physics

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In this paper, the mechanism of growth strain is discussed based on the irreversible evolving equations by considering the coupling effects of stress and chemical reaction during isothermal oxidation, and a simple model relating the growth strain and the oxide thickness is developed. If the effect of the stress on the chemical reaction is not taken into account, the model reduces to the Clarke assumption. The expression of Dox is exhibited, and its value can be determined by experiments. The stress evolving equations are derived, where the viscoplastic strain of the oxide and metal and the growth strain of the oxide are considered. Numerical results are given and compared with results from experiments and the existing model. There is good agreement between the proposed model and the experimental data.

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Residual stress analysis in the oxide scale/metal substrate system due to oxidation growth strain and creep deformation

Cited by 37 publications

References 40 publications

Real Time Test in situ of Superalloy Oxide Scale Stress by Archimedes Curve Slice Moment Technique

Real Time Test in situ of Superalloy Oxide Scale Stress by Archimedes Curve Slice Moment Technique

The Study of Superalloy Oxide Scale Stress

General approach on chemistry and stress coupling effects during oxidation

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