Microstructure-based assessment of creep rupture behaviour of cast-forged P91 steel

Pandey, Chandan; Mahapatra, Manas Mohan; Kumar, Pradeep; Vidyrathy, R.S.; Srivastava, Anubhav

doi:10.1016/j.msea.2017.04.037

Cited by 74 publications

(21 citation statements)

References 27 publications

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“…Features also indicate precipitation of second phase particles at grain boundary regions. When 2014 Aluminum alloy is exposed to elevated temperatures, CuAl 2 particles will precipitate from the matrix [10].…”

Section: Resultsmentioning

confidence: 99%

Indentation Creep Behavior of Nugget Zone of Friction Stir Welded 2014 Aluminum Alloy

Das

Robi

Sankar

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The present study is aimed at evaluating the creep behavior of the nugget zone of friction welded 2014 Aluminum alloy by indentation creep tests. Impression creep testing was carried out at different temperatures of 300ºC, 350ºC and 400 ºC with stress124.77MPa, 187.16MPa, 249.55 MPa using a 1.0 mm diameter WC indenter. Experiments were conducted till the curve enters the steady state creep region. Constitutive modeling of creep behavior was carried out considering the temperature, stress and steady state creep rate. Microstructural investigation of the crept specimen at 400ºC temperature and 187.16 MPa load was carried out and found that the small precipitates accumulate along the grain boundaries at the favorable conditions of the creep temperature and stress, new precipitates evolve due to the ageing. The grains are broken and deformed due to the creep phenomena.

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Section: Resultsmentioning

confidence: 99%

Indentation Creep Behavior of Nugget Zone of Friction Stir Welded 2014 Aluminum Alloy

Das

Robi

Sankar

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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“…In addition, the MX carbides completely precipitate in the solution treatment stage of a steel because of the high precipitation temperature, allowing effective grain refinement [89]. Consequently, the increasing grain and subgrain boundary area significantly hinders the movement and aggregation of dislocations, leading to local hardening [90]. Fig.…”

Section: Radiation Resistance Of Nanoprecipitatesmentioning

confidence: 99%

Strengthening mechanisms of reduced activation ferritic/martensitic steels: A review

Zhou

Shen

Jia

2021

Int J Miner Metall Mater

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This review summarizes the strengthening mechanisms of reduced activation ferritic/martensitic (RAFM) steels. High-angle grain boundaries, subgrain boundaries, nano-sized M 23 C 6 , and MX carbide precipitates effectively hinder dislocation motion and increase high-temperature strength. M 23 C 6 carbides are easily coarsened under high temperatures, thereby weakening their ability to block dislocations. Creep properties are improved through the reduction of M 23 C 6 carbides. Thus, the loss of strength must be compensated by other strengthening mechanisms. This review also outlines the recent progress in the development of RAFM steels. Oxide dispersion-strengthened steels prevent M 23 C 6 precipitation by reducing C content to increase creep life and introduce a high density of nano-sized oxide precipitates to offset the reduced strength. Severe plastic deformation methods can substantially refine subgrains and MX carbides in the steel. The thermal deformation strengthening of RAFM steels mainly relies on thermo-mechanical treatment to increase the MX carbide and subgrain boundaries. This procedure increases the creep life of TMT(thermo-mechanical treatment) 9Cr-1W-0.06Ta steel by ~20 times compared with those of F82H and Eurofer 97 steels under 550°C/260 MPa.

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“…Based on the results of fatigue tests, Veerababu et al [7] found the fatigue strength of P92 steel welded joints to be significantly degraded by comparing it to the fatigue strength of the homogeneous base metal. Pandey et al [8] studied the formation mechanism of various microstructures in different regions of a P92 steel welded joint and found that the welding process produced a heterogeneous microstructure in the heat-affected zone (HAZ) of the welded joint. Those regions have different sensitivities to the macroscopical CF loading [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

The Investigation of the Fracture Behavior of a Chinese 9% Cr Steel Welded Joint under Creep-Fatigue Interactive Loading

Song

Liu³

et al. 2021

Applied Sciences

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To understand the premature-fracture mechanisms of long-term service damage of an advanced alloy’s (Chinese P92 steel) welded joint, the creep-fatigue (CF) experiments with holding times of 30, 120, 300, 600 and 900 s were individually performed at 923 K. The cyclic softening, inelastic-strain amplitudes and stress-relaxation behaviors were compared between welded and base-metal (BM) specimens. From the results, the failure stage of the welded specimens occupies 45% of the lifetime fraction, while it only takes up 20% of the lifetime fraction in BM specimens with short holding times (30 and 120 s). Furthermore, only two softening stages were observed for both kinds of CF specimens with long holding times. The absence of a third softening stage in longer-held specimens indicates that the processes of macroscopic-crack initiation, propagation and rupture were accelerated. Based on the observation of the fracture surfaces, the fracture mechanism shifted from fatigue-dominated damage to creep-fatigue interaction when the holding period was increased.

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Microstructure-based assessment of creep rupture behaviour of cast-forged P91 steel

Cited by 74 publications

References 27 publications

Indentation Creep Behavior of Nugget Zone of Friction Stir Welded 2014 Aluminum Alloy

Indentation Creep Behavior of Nugget Zone of Friction Stir Welded 2014 Aluminum Alloy

Strengthening mechanisms of reduced activation ferritic/martensitic steels: A review

The Investigation of the Fracture Behavior of a Chinese 9% Cr Steel Welded Joint under Creep-Fatigue Interactive Loading

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