Notch brittleness of Ti–15V–3Cr–3Sn–3Al alloys

Hsu, Hsiao-Hung; Wu, Yen-Chieh; Tsay, L.W.

doi:10.1016/j.msea.2012.02.068

Cited by 15 publications

(9 citation statements)

References 17 publications

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“…It was observed that as the temperature increases the J values do not converge in the near field paths due to an excessive drop in the yield stress and enhanced plasticity. An increase in J values was recorded for increasing temperatures [20] as shown in Fig.14. That also points out to the fact that the path independency of the J integral could not be maintained at higher plasticity [21].…”

Section: Finite Element Analysis Of Experimental Workmentioning

confidence: 80%

Experimental Study and Computer Simulation of Fracture Toughness of Ni Base Superalloy using CT Specimen

Hasan

Soi

Mirzajavadkhan

et al. 2018

IJEMM

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Due to superior mechanical and metallurgical performance, Nickel-base Alloys 617 and 276 have been considered as structural material for used in complex and stochastic applications. Surface irregularities such as cracks in the material may be vulnerable to the structural integrity of an engineering component. Void growth behavior is however analyzed using crystal plasticity theory in nickel-based super alloys. Elastic-plastic fracture mechanics base single compact tension specimen has been used to determine the J1C value as a function of temperature of austenitic Alloy 617 and 276 for ductile crack growth behavior. Crack formation is appropriately explained through crack nucleation based on the microstructural heterogeneity properties of the alloys. Alloy 617 showed a fair increased resistance to fracture as temperature increased from ambient to 5000C for duplicate testing, satisfying the EPFM criteria. Whereas the J1C values of Alloy 276 increased gradually with temperature up to 300° C and due to enhanced plasticity in the vicinity of 4000 C this alloy shows inconsistent value. Two-dimensional simulation of J-integral model of these nickel base super alloys at temperature range 1000C to 5000 C has been proposed. Particular focus is given on the load line displacement where crack propagation occurs during the loading phase only. Path independency of J-integral has been clearly demonstrated for both the alloys up to 3000 C employing finite element analysis meshing with 1922 quadrilateral 2D solid elements in ANSYS. Cracks are typically initiated in relation to the level of strain range. A higher strain range initiates cracks due to precipitate shearing, whereas a low strain range initiates cracks with oxidation reactions and carbide diffusion. The values of K1C and crack tip opening displacement for these alloys have been calculated based on the experimental data. Moreover, fracture morphology in the loading and unloading sequences near the crack tip has been analyzed by SEM.

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Section: Finite Element Analysis Of Experimental Workmentioning

confidence: 80%

Experimental Study and Computer Simulation of Fracture Toughness of Ni Base Superalloy using CT Specimen

Hasan

Soi

Mirzajavadkhan

et al. 2018

IJEMM

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“…Increasing the aging temperature to 482°C or higher, the decreased FCGRs of the over-aged specimens were due to the improved fracture toughness as compared with the A426 and A371 specimens. 11) For the A538 and A593 specimens tested at R = 0.1, transgranular fatigue with coarse stripes on the fracture surface was observed for all the ¦K ranges (Fig. 5(e)).…”

Section: Fractographic Examinationsmentioning

confidence: 86%

Fatigue Crack Growth Characteristics of a Ti–15V–3Cr–3Sn–3Al Alloy with Variously Aged Conditions

2013

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In this study, the fatigue crack growth rate (FCGR) of a Ti15V3Cr3Al3Sn (Ti-15-3) alloy, which was aged at a temperature range of 371 to 593°C, was measured in air at room temperature. The specimen aged at 371°C showed clear serrations in the crack growth curve at a stress ratio (R) of 0.1, and it also exhibited a larger Paris law gradient than the other aged specimens at R = 0.5. The peak-aged (426°C aged) specimen had the highest FCGR of the specimens, regardless of the stress ratio. A gradual decrease in the FCGRs with increasing aging temperature, from 482 to 593°C, was observed for the over-aged specimens. Cleavage-like fracture was more likely to occur in the under-and peak-aged specimens as compared to the transgranular fatigue in the over-aged specimens. It seemed that the coarse ¡ platelets with lowered hardness in the over-aged specimens resulted in a higher resistance to fatigue crack growth in the Ti-15-3 alloy.

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“…Similarly, stress concentrating geometric features such as holes and notches will generally reduce the strength of brittle materials such as crystalline and amorphous ceramics. In contrast, crystalline metals and intermetallic compounds will often show a notch strengthening effect during notched tensile tests if they are sufficiently ductile. Materials that show strengthening are often termed notch ductile .…”

Section: Deformation Response Of Bulk Metallic Glassesmentioning

confidence: 99%

“…However, it is important to note that notches do increase the tendency of ductile materials to transition to brittle fracture mechanisms due to several factors including the high local stress, high local strain hardening, the triaxial stress state, and the local magnification of the strain rate . Accordingly, embrittlement effects such as hydrogen or temper embrittlement can become apparent during notched tensile tests well before smooth samples show a significant effect making notched samples desirable for studying embrittlement phenomena . Metals that demonstrate a notch weakening, or notch brittle, behavior are often described as notch sensitive.…”

Section: Deformation Response Of Bulk Metallic Glassesmentioning

confidence: 99%

Bulk Metallic Glasses as Structural Materials: A Review

Kruzic

2016

Adv Eng Mater

228

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Bulk metallic glasses (BMGs) can exhibit excellent combinations of strength and fracture toughness that cannot be achieved by traditional metals, making them attractive for load bearing, mechanical engineering applications. Furthermore, recent research on BMGs has shown that many early perceived shortcomings, such as apparent brittleness or poor fatigue resistance, are not as big of a problem as once thought. The purpose of this paper is to review some of the unique mechanical characteristics of BMGs along with some of the strategies that may be used to improve or exploit their characteristics so that BMGs may be used as structural materials in engineering applications.

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Notch brittleness of Ti–15V–3Cr–3Sn–3Al alloys

Cited by 15 publications

References 17 publications

Experimental Study and Computer Simulation of Fracture Toughness of Ni Base Superalloy using CT Specimen

Experimental Study and Computer Simulation of Fracture Toughness of Ni Base Superalloy using CT Specimen

Fatigue Crack Growth Characteristics of a Ti–15V–3Cr–3Sn–3Al Alloy with Variously Aged Conditions

Bulk Metallic Glasses as Structural Materials: A Review

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Notch brittleness of Ti–15V–3Cr–3Sn–3Al alloys

Cited by 15 publications

References 17 publications

Experimental Study and Computer Simulation of Fracture Toughness of Ni Base Superalloy using CT Specimen

Experimental Study and Computer Simulation of Fracture Toughness of Ni Base Superalloy using CT Specimen

Fatigue Crack Growth Characteristics of a Ti&ndash;15V&ndash;3Cr&ndash;3Sn&ndash;3Al Alloy with Variously Aged Conditions

Bulk Metallic Glasses as Structural Materials: A Review

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Fatigue Crack Growth Characteristics of a Ti–15V–3Cr–3Sn–3Al Alloy with Variously Aged Conditions