Influence of prior creep-fatigue exposure on remnant tensile and creep properties of AISI 321 austenite stainless steel

Chen, Huitao; Li, Wei; Chen, Wei; Chen, Jian; Zhang, Shengde

doi:10.1016/j.ijfatigue.2022.106826

Cited by 12 publications

(20 citation statements)

References 67 publications

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“…When cycles reach 30% lifetime fraction, the strain amplitude of aluminized AISI 321 has the lowest value (0.433%). Compared with bare AISI 321 24 whose lowest strain amplitude is 50% lifetime fraction under the same test conditions, it could be concluded that the lifetime fraction corresponding to lowest strain amplitude would be put earlier by the additions of aluminized coatings. This phenomenon is associated with coating structure evolutions during C‐F deformation.…”

Section: Resultsmentioning

confidence: 91%

“…These lifetime fractions are computed relatively to a set of three particular samples loaded until failure. To keep consistent with our previous works, 24 the hold time of 30 s was selected for forthcoming tests.…”

Section: Methodsmentioning

confidence: 99%

“…Afterward, the samples were punched into disks (3 mm in diameter), followed by perforation via ion‐beam thinning method. Detailed procedures of TEM specimen preparations are visible in Chen et al 24 For tensile and creep fracture surface, their morphologies were observed by scanning electron microscope (SEM, JEOL 7900F).…”

Section: Methodsmentioning

confidence: 99%

“…Nevertheless, this critical point of aluminized AISI 321 also is lower compared with that of uncoated AISI 321 (50%). 24…”

Section: Remnant Creep Propertiesmentioning

confidence: 99%

“…A rational discussion including the influence of microstructural evolution during prior C‐F on remnant properties was also provided. Moreover, detailed cyclic deformation mechanisms of the studied steel substrate can refer to our recent work, 24 in which the residual performance of bare AISI 321 under prior C‐F exposure was well investigated.…”

Section: Introductionmentioning

confidence: 99%

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Remnant tensile and creep properties of aluminized AISI 321 austenite stainless steel under prior creep–fatigue interaction

Chen

et al. 2022

Fatigue Fract Eng Mat Struct

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Aluminized AISI 321 steels applied as heat exchange tube are generally subjected to creep-fatigue (C-F) exposure during service. Remaining tensile and creep performance of this steel at 620 C were therefore studied under prior C-F deformation. Results revealed that residual properties exhibit an initial increase and followed degradation with rising lifetime fraction of prior C-F.The tensile strength and creep lifespan reach highest at 30% lifetime fraction, since dislocation cell networks are well developed and secondary nanotwins are activated at substrate. Additionally, dynamic recovery and wavy slips occurred in coatings partially accommodate local plastic deformations and inhibit defect initiations, avoiding premature material fracture. On the other hand, these networks could restrain the increase in coating thicknesses. When the lifetime fraction of prior C-F increases to 80%, declined remnant properties are observed, which is attributed to the recovery of dislocation cells and carbide coarsening. Meanwhile, coating microcracks also accelerate steel failure.

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Section: Resultsmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…Nevertheless, this critical point of aluminized AISI 321 also is lower compared with that of uncoated AISI 321 (50%). 24…”

Section: Remnant Creep Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%