Probing the deterioration of 316L stainless steel welds due to ageing and creep by indentation creep tests

Prasanna, H. Udaya; Udupa, K. Rajendra

doi:10.1016/j.nucengdes.2011.09.012

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…In order to obtain creep data at specific true strain levels, impression creep testing of sections of plastically deformed uniaxial test specimens was utilised in the present work. This approach makes it easier to investigate more localised creep behaviour in systems where the pre-straining is not uniform, similar to the way in which the test method has been used to characterise weldments [7]. The novelty in testing is the opportunity to remove material for impression specimens from the elongated gauge section of a failed hot tensile specimen at points of specific strain.…”

Section: Strain Induced In Components During Manufacturementioning

confidence: 99%

An investigation of the effect of pre-straining on the creep behaviour of a P91 steel at 600 °C using impression creep testing

Brett

Dyson

Maskill

et al. 2020

Materials Science and Engineering: A

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This paper investigates the effect of high temperature tensile strain on subsequent creep strength in a grade 91 steel using impression creep testing. The grade 91 material investigated has been tested in two different microstructural conditions, in the normal martensitic condition and in an aberrant mis-heat treated condition in which the microstructure is 100% ferrite. The latter condition is of interest because of its widespread occurrence on operating power plant. The two microstructural conditions were confirmed by hardness mapping and Electron Back Scattered Diffraction (EBSD). Previous investigations have used pre-strained uniaxial creep specimens to investigate this effect, but the present work has utilised the specialised small-scale impression creep testing technique to test material obtained at a number of positions along the axes of failed hot tensile specimens. This allowed impression creep samples to be extracted at various prestrains for investigation and for a wide range of hot tensile pre-strain to be investigated. The two microstructural conditions have shown a divergence in behaviour, with the normal martensitic material showing little change in creep strength with increasing pre-strain and the aberrant material increasing markedly in creep strength with increasing pre-strain.

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Section: Strain Induced In Components During Manufacturementioning

confidence: 99%

An investigation of the effect of pre-straining on the creep behaviour of a P91 steel at 600 °C using impression creep testing

Brett

Dyson

Maskill

et al. 2020

Materials Science and Engineering: A

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“…18 Mostly, dislocation creep and grain boundary sliding mechanisms were observed during the ICT of the 316L weld joint. 19 Kalvala et al 20 observed that the HAZ of the FSWed P91 steel is identified with the fine fragmentation and uniform distribution of prior austenite grains (PAGs) and less carbide coarsening than the HAZ of the Submerged arc welded (SAW) joint. Wang 21 correlated the localized creep rate with the microstructural gradients of the 2.25Cr-1Mo-310 SS DWJ.…”

Section: Introductionmentioning

confidence: 99%

Unravelling the microstructure – indentation creep resistance relationships for friction stir welded modified 9Cr-1Mo steel and LN-type 316 stainless-steel dissimilar joints

krishna¹,

Lakshminarayanan²,

Vasantharaja

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this article, the indentation creep characteristics and the microstructures are assessed for the friction stir welded modified 9Cr-1Mo steel and LN-type 316 SS dissimilar joint. Microstructures are characterized for the post-weld heat treated and indentation crept samples at different conditions with optical microscopy, scanning electron microscope and energy dispersive X-ray spectroscopy. Distinct heat-affected zones were revealed with the refined and reformed martensite (α′) and austenite (γ) structures that formed in view of the distinct thermal conductivity property and the differences in lower critical(Ac1) and upper critical(Ac3) transformation temperatures. The size of prior austenite grain sizes was found to be varied significantly at the different regions. Indentation creep data were acquired in distinct weld zones at 873, 898 and 923 K. Zone-wise indentation depth, steady-state creep behaviour (SSCR) and activation energy ( Q) were evaluated and correlated with the microstructures. The formation of small prior austenitic grain (PAG) structures and the grain boundary vacancies has led to maximum creep deformation (86.83%) at the heat affected zone of the modified 9Cr-1Mo steel. Furthermore, the reduction in lath structures and the formation of tiny α′ with soft substructures have lowered the hardness values to around 210 ± 21 HV, which is 20 HV less than the post weld heat treated sample. In the stir zone, the presence of dynamically refined and rich γ along with fine α′ layers has improved the steady-state creep rate of 9.112 E-7, which is less than the modified 9Cr-1Mo steel and the heat affected zone at modified 9Cr-1Mo side. The coarse austenite structures that existed in the LN-type 316 base metal have resisted more creep damage and exhibited high activation energy (i.e. 490 kJ mol−1) than the stir zone and heat affected zone of the LN-type 316 SS.

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Deciphering the Indentation Creep Characteristics and the Metallurgical Aspects of the 9Cr1MoVNb(P91) and SS316LN Dissimilar Butt Joint

Krishna,

Lakshminarayanan,

Vasantharaja

et al. 2024

J. of Materi Eng and Perform

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Probing the deterioration of 316L stainless steel welds due to ageing and creep by indentation creep tests

Cited by 4 publications

References 7 publications

An investigation of the effect of pre-straining on the creep behaviour of a P91 steel at 600 °C using impression creep testing

An investigation of the effect of pre-straining on the creep behaviour of a P91 steel at 600 °C using impression creep testing

Unravelling the microstructure – indentation creep resistance relationships for friction stir welded modified 9Cr-1Mo steel and LN-type 316 stainless-steel dissimilar joints

Deciphering the Indentation Creep Characteristics and the Metallurgical Aspects of the 9Cr1MoVNb(P91) and SS316LN Dissimilar Butt Joint

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