Sigma phase-induced failure of AISI 310 stainless steel radiant tubes

Bahrami, Abbas; Ashrafi, Ali; Rafiaei, Seyed Mahdi; Mehr, M. Yazdan

doi:10.1016/j.engfailanal.2017.08.027

Cited by 32 publications

(8 citation statements)

References 16 publications

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“…ployed to produce stainless steel parts [6][7][8][9][10]. Some researchers have studied the impact of the sintering process on mechanical properties of MIM HK30 alloy.…”

mentioning

confidence: 99%

Microstructure and Mechanical Properties of Metal Injection Molding HK30 Stainless Steel Sintered in N2 and Ar Atmosphere

Yong¹,

Li²,

Lou³

et al. 2019

Int J Metall Met Phys

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The effects of different sintering atmospheres (nitrogen and argon) on the densification, microstructure, and mechanical properties of HK30 stainless steel were studied. Compared with those of the samples sintered in Ar, sintered samples in N 2 had a lower density and higher N content. Some of the N atoms dissolved into the austenite matrix, and others were combined with metal atoms to be precipitated along the grain boundaries. Samples sintered in N 2 had a higher hardness than those in Ar. The hardness decreased with the distance from the edge to the center. The highest hardness was 360 HV 1.0 at the edge, the lowest one was 220 HV 1.0 at the center. The samples sintered in N 2 had a higher tensile strength than those sintered in Ar at testing temperatures from room temperature to 1000 °C.

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“…ployed to produce stainless steel parts [6][7][8][9][10]. Some researchers have studied the impact of the sintering process on mechanical properties of MIM HK30 alloy.…”

mentioning

confidence: 99%

Microstructure and Mechanical Properties of Metal Injection Molding HK30 Stainless Steel Sintered in N2 and Ar Atmosphere

Yong¹,

Li²,

Lou³

et al. 2019

Int J Metall Met Phys

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“…The effect of inhomogeneity in deformation and a strong interaction between the creep, oxidation, and DSA during IP TMF cycling led to a drastic reduction in fatigue life for 316 LN SS base metal 32,33,35–37 . The transformation of meta‐stable δ‐ferrite into carbides and intermetallic σ or χ or laves phases in the austenitic SS weld metal is an important degradation mechanism at high temperature, depending on the time of exposure and chemical composition 7–11 . The development of damage gets further enhanced in the presence of cyclic loading due to increase in the dislocation density which provides an easy path for the diffusion of solute atoms and increases the localized deformation along the interfaces of austenite/δ‐ferrite/σ‐phase 10,12,57 .…”

Section: Discussionmentioning

confidence: 99%

“…Safe‐life design approach must consider the complex interactions between the above loadings, taking into account the presence of metallurgically heterogeneous and structurally weaker weld joints (WJ). Key factors pertaining to the structural integrity of welded components are (a) metallurgical notch effect which arises due to a difference in the strength levels in its constituent regions 3–6 and (b) inherent microstructural instability when subjected to long periods of operation at elevated temperatures 7–12 . Either of the above can result in early failures under service loadings.…”

Section: Introductionmentioning

confidence: 99%

“…[7][8][9][10][11][12] Either of the above can result in early failures under service loadings. Extensive studies are available on the nature and kinetics of microstructural transformations in austenitic SS base metal (BM) 13 and weld metal [7][8][9][10][11] under different combinations of temperature and aging periods. However, the influence of cyclic loading on the microstructural transformation and fracture behavior of SS welds have received limited attention, compared with the base metal.…”

Section: Introductionmentioning

confidence: 99%

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New insights into thermomechanical fatigue behavior of AISI Type 316 LN SS weld joint

Telagathoti

Nagesha

Ramamurthy

2021

Fatigue Fract Eng Mat Struct

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Cyclic deformation and fracture behavior of a type 316 LN austenitic stainless steel (SS) weld joint (WJ) were investigated under thermomechanical fatigue (TMF) and isothermal low cycle fatigue (IF) cycling at the maximum temperature (Tmax) of TMF. A higher cyclic stress response (CSR) and reduced cyclic softening were observed under TMF compared with IF tests. In‐phase (IP) TMF resulted in lower lives compared with IF cycling at the Tmax and out‐of‐phase (OP) TMF, which was attributed to the more pronounced creep‐induced intergranular damage. Characterization of microstructural features and microhardness variations revealed that the accumulation of damage and associated failure depends on the strength and microstructural gradient, together with the deformation incompatibility. The crack propagation is found to depend on the individual and synergistic interactions of the microstructural transformations, creep, and oxidation, depending on the type of fatigue cycle (IF and IP/OP TMF), strain amplitude, and thermal cycling effects.

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“…During exposure under these special conditions, steels are doomed to undergo microstructural evolution, leading to mechanical properties degeneration (Ref [8][9][10]. Such microstructural evolution during high-temperature and long-term service in austenite heatresistant steels mainly involves the following aspects: (1) growth of austenite grain size; (2) ripening of precipitates such as carbides and nitrides; and (3) formation and growth of rphase (Ref [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of an Austenitic Heat-Resistant Steel after Service at 570 °C and 25.4 MPa for 18 Years

Yu²,

Yang

et al. 2021

J. of Materi Eng and Perform

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Microstructure and mechanical properties of an austenitic heat-resistant steel (12Cr18Ni12Ti) serviced in a supercritical power plant at 570 °C/25.4 MPa for 160,000 h were investigated. The results show that the hardness and the tensile strength did not decrease; however, the impact toughness was remarkably reduced. The TiC precipitate shows excellent thermostability; for example, it hardly grew up, and no big M23C6 carbides were found. However, large Fe, Cr-rich σ-phase was doomed to precipitate along grain boundary, which should be responsible for the reduced toughness. The growth of σ-phase was observed to have an interaction with the preexisted carbides.

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Sigma phase-induced failure of AISI 310 stainless steel radiant tubes

Cited by 32 publications

References 16 publications

Microstructure and Mechanical Properties of Metal Injection Molding HK30 Stainless Steel Sintered in N2 and Ar Atmosphere

Microstructure and Mechanical Properties of Metal Injection Molding HK30 Stainless Steel Sintered in N2 and Ar Atmosphere

New insights into thermomechanical fatigue behavior of AISI Type 316 LN SS weld joint

Microstructure and Mechanical Properties of an Austenitic Heat-Resistant Steel after Service at 570 °C and 25.4 MPa for 18 Years

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