Effects of plastic pre-straining level on the creep deformation, crack initiation and growth behaviour of 316H stainless steel

Mehmanparast, Ali; Davies, Catrin M.; Dean, David; Nikbin, Kamran

doi:10.1016/j.ijpvp.2016.03.013

Cited by 40 publications

(14 citation statements)

References 19 publications

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“…The processed deformation data were applied as displacement boundary conditions on the cut face. A linear elastic material model was used with Young's modulus, , and Poisson's ratio, , of 205 GPa and 0.29 respectively (Mehmanparast et al, 2016) to determine the residual stresses that existed before sectioning the sample.…”

Section: The Contour Methodsmentioning

confidence: 99%

Quantification of residual stresses in electron beam welded fracture mechanics specimens

Kapadia

Davies

Pirling

et al. 2017

International Journal of Solids and Structures

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Residual stress measurements have been made in a range of electron beam welded samples to study how the weld induced residual stresses redistributed during fabrication of compact tension, C(T), specimens. The samples were manufactured from Type 316H stainless steel in the ex-service material condition and in material which had been preconditioned by inducing 8% plastic strain. Measurements made using neutron diffraction, slitting and the contour method were generally in good agreement and showed residual stress components of up to three times the base material's yield strength existed in the samples. When sectioning a sample to perform the contour method, large elastic deformations occurred at the cut tip due to the large residual stresses present. A correction was applied to the measured surface displacements to account for this deformation. Neutron diffraction measurements were made at various stages of the fabrication process, which showed significant stress redistribution occurred as the welded samples were machined into C(T) specimens.However the tensile stresses near the crack tip of the C(T) specimens remained large and could significantly influence subsequent crack growth tests. Highlights Electron beam welding is shown to produce repeatable residual stress fields in thick samples

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Section: The Contour Methodsmentioning

confidence: 99%

Quantification of residual stresses in electron beam welded fracture mechanics specimens

Kapadia

Davies

Pirling

et al. 2017

International Journal of Solids and Structures

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“…This suggests that creep strain is not always equally damaging, the results suggest that for a fixed amount of creep strain, the slower it is accumulated the more damaging it is to the specimen. Previous work on this material has shown that prior plastic loading will lower the creep ductility of a specimen [32], suggesting that the tests conducted at a high load would have failed at a greater creep strain had there not been significant plastic strain at the notch during load up. This further confirms the view that creep strain is less damaging the faster it is accumulated in this material.…”

Section: Discussionmentioning

confidence: 93%

The effect of creep strain rate on damage accumulation in Type 316H austenitic stainless steel

Hares

Mostafavi

Bradford

et al. 2018

International Journal of Pressure Vessels and Piping

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Many service components in power generation and aerospace industries operate at high temperatures and stresses that make them susceptible to creep deformation and damage. Their complex geometries and load multi-axiality are often treated only approximately in assessing their structural integrity via assessment codes that are based on standard creep tests. For example, the forward creep (defined here as constant load creep) test of round bars is not a true representation of the stress state that service components generally experience. The experiments conducted in this work used notched bar specimens to simulate the effect of stress triaxiality. The results from these experiments were then used to validate a well-established creep ductility exhaustion damage model. Although the damage model is largely based on uniaxial creep rupture tests, it has been previously adapted so that it can be applied to more complex states of stress. Rupture calculations were conducted prior to experimental testing to obtain an estimation of the duration of the experiments. The finite element simulation results, which utilised previously developed creep deformation and damage models, were then compared to the experimental data. It was shown that the model predicted the correct trend for the creep deformation and failure of the specimens and primary, secondary and tertiary creep behaviour of notched bars could be captured. The tests imply that the effective creep ductility was smaller at lower stresses, i.e., at slower strain rates creep strain was more damaging.

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“…It has been shown in previous studies [15][16][17][18] that plastic pre-straining significantly reduces the creep ductility of the material, compared to the as-received material state. Further shown in the literature is that the creep crack growth (CCG) behaviour of the pre-compressed 316H stainless steel material is similar to the HAZ specimens which is hypothesised to be due to similar creep deofmration and ductility in the PC and HAZ material states [15].…”

Section: Introductionmentioning

confidence: 93%

Determination of Long-Term Creep Properties for 316H Steel Using Short-Term Tests on Pre-strained Material

2021

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Determination of long-term creep rupture properties for 316H steel is both costly and time-consuming and given the level of scatter in the data would need substantial number of tests to be performed. The primary objective of this study is to estimate the long-term creep properties of cross-weld (XW) and as-received (AR) 316H stainless steel by performing accelerated tests on pre-compressed (PC) material. In this work, uniaxial creep rupture tests have been performed on XW specimens and the results have been used to establish a correlation with accelerated test results on the PC material. Moreover, tensile tests have been performed on XW specimens at room temperature and 550 °C to examine the pre-conditioning effects on the mechanical response of the material. Similar power-law creep properties have been found for the creep strain rate and rupture time behaviour of the XW and PC specimens. It also has been found that the creep ductility data points obtained from XW and PC specimens fall upon the estimated trend for the AR material at 550 °C when the data are correlated with the applied stress normalised by 0.2% proof stress. The results show that the long-term creep properties of the XW and AR material can be estimated in much shorter time scales simply by performing tests on the PC material state.

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Effects of plastic pre-straining level on the creep deformation, crack initiation and growth behaviour of 316H stainless steel

Cited by 40 publications

References 19 publications

Quantification of residual stresses in electron beam welded fracture mechanics specimens

Quantification of residual stresses in electron beam welded fracture mechanics specimens

The effect of creep strain rate on damage accumulation in Type 316H austenitic stainless steel

Determination of Long-Term Creep Properties for 316H Steel Using Short-Term Tests on Pre-strained Material

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