Larson–Miller correlation for the effect of thermal ageing on the yield strength of a cold worked 15Cr–15Ni–Ti modified austenitic stainless steel

Samuel, K.G.; Ray, S.

doi:10.1016/j.ijpvp.2006.02.032

Cited by 17 publications

(5 citation statements)

References 6 publications

(10 reference statements)

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“…It can be seen that they do not provide good fits to experimental data, and as such, are often implemented in a more flexible way. The more practical application of these models provides individual fits at each temperature such that their parameters function, P , change with temperature rather than being tied to an initially derived value [ 47 – 49 ]. This produces substantially better fits but also introduces the unknown dependency of these parameters, and hence constants, to temperature.…”

Section: Resultsmentioning

confidence: 99%

A Critical Analysis of the Conventionally Employed Creep Lifing Methods

et al. 2014

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The deformation of structural alloys presents problems for power plants and aerospace applications due to the demand for elevated temperatures for higher efficiencies and reductions in greenhouse gas emissions. The materials used in such applications experience harsh environments which may lead to deformation and failure of critical components. To avoid such catastrophic failures and also increase efficiency, future designs must utilise novel/improved alloy systems with enhanced temperature capability. In recognising this issue, a detailed understanding of creep is essential for the success of these designs by ensuring components do not experience excessive deformation which may ultimately lead to failure. To achieve this, a variety of parametric methods have been developed to quantify creep and creep fracture in high temperature applications. This study reviews a number of well-known traditionally employed creep lifing methods with some more recent approaches also included. The first section of this paper focuses on predicting the long-term creep rupture properties which is an area of interest for the power generation sector. The second section looks at pre-defined strains and the re-production of full creep curves based on available data which is pertinent to the aerospace industry where components are replaced before failure.

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Section: Resultsmentioning

confidence: 99%

A Critical Analysis of the Conventionally Employed Creep Lifing Methods

et al. 2014

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“…This resulted the value of C as 13. The same value of the constant C was used to correlate the tensile properties of D9 alloy in an earlier investigation [17]. Hence, in the present investigation, the value of C as 13 has been taken for the correlation analysis.…”

Section: Resultsmentioning

confidence: 99%

Study of tensile behaviour of thermally aged alloy D9 wrapper tubes of fast breeder reactor using acoustic emission

Mukhopadhyay

Phaniraj

Jayakumar

et al. 2014

Strength, Fracture and Complexity

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BACKGROUND: Hexagonal wrapper tubes in fast breeder reactor (FBR) contain smaller circular tubes called fuel pins made of austenitic 15Cr-15Ni-Ti modified stainless steel (alloy D9). This is used in 20% cold worked condition. At maximum service temperature of fuel clad (around 973 K), prolonged exposure to high temperature could remove the effect of cold work. Thermal ageing of cold worked alloy D9 at 823-1123 K results in carbide precipitation which affect the subsequent deformation behaviour. OBJECTIVE: The tensile behaviour of alloy D9 after ageing at 823-1123 K for 10-10,000 h has been studied using acoustic emission (AE). METHODS: Tensile tests along with AE monitoring were conducted at room temperature at nominal strain rate of 1.33 × 10 −3 s −1 . RESULTS: Strength decreased and elongation increased with ageing temperature. Till 1000 h ageing time, AE parameters (up to yield) decreased with ageing temperature. But for 5000 and 10,000 h, they increased first and then decreased with a peak at around 973 K. This coincides with a trough in elongation at around 973 K. CONCLUSIONS: The trough in elongation has been attributed to increasing difficulty of plastic deformation by pinning of dislocations. A correlation exists among tensile, Larson-Miller (LMP) parameter and AE parameters.

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“…The maximum load was fixed at 10 mN and a trapezoidal load function (30 s load to the maximum load value, maintenance for 10 s, and unloading in 30 s) was used. In order to obtain statistically reliable data, for each experimental condition, matrices of 8 × 8 (64) indents were carried out. The nanoindentation measurements were subsequently analyzed using the Oliver and Pharr method [26][27][28].…”

Section: Methodsmentioning

confidence: 99%

“…and is used to obtain a master curve of hardness or yielding as a function of tempering parameters (temperature and duration) [64][65][66]. Thus, the idea of using Eq.…”

Section: 2mentioning

confidence: 99%