The relationship between brittle fracture temperature and stress concentration in bcc steels

Said, G.; Talaş, Şükrü

doi:10.1016/j.mechmat.2003.11.004

Cited by 15 publications

(16 citation statements)

References 2 publications

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“…A hypothesis was developed on ferritic steels by taking account of the exponential dependence to plastic deformation at the crack tip of the fracture toughness on thermo‐activation energy analysis . The mathematical expression of this hypothesis is given in formula ().…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The method used in the present study that reveals the relationship between the fracture toughness and the basic mechanical properties aims to eliminate the need for cracked specimens in the determination of the fracture toughness. The basis of the used method on the thermo‐activation energy analysis of the plastic deformation of metals is composed of the relationship between the fracture toughness and strain rate, temperature, grain size and mechanical properties …”

Section: Introductionmentioning

confidence: 99%

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A new method for determining the fracture toughness of main pipeline steels

Said

Aytekin

2013

Fatigue Fract Eng Mat Struct

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One of the fundamental aims of fracture mechanics is to define fracture toughness KIC of a material. Hence, the ASTM E399 standard was developed. However according to the standard, large‐sized specimens are required to determine the fracture toughness of low alloy carbon steels. ASTM E1921 standard was developed on the fracture toughness of ferritic steels. In this study, a new method was proposed to determine the fracture toughness of ferritic steels. The purpose of the present paper is to compare the results of the method with the experimental results. Two steels that are used in gas and oil main pipelines were investigated in this study.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new method for determining the fracture toughness of main pipeline steels

Said

Aytekin

2013

Fatigue Fract Eng Mat Struct

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“…The presence of sharp notches or stress concentrations in a material, however, can increase the likelihood of cracking or sensitivity under tensile straining. 13,14) It was reported that a crack nucleating in triaxial tensile field ahead of a notch may cause failure if the local stress intensity reaches the fracture toughness of the material.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Microstructure and Notch Tensile Strength in Ti–15V–3Cr–3Sn–3Al Alloy at Elevated Temperatures

2013

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The notch tensile strength (NTS) of Ti15V3Cr3Sn3Al (Ti-15-3) aged at temperatures ranging from 426 to 600°C was determined at elevated temperatures, and correlated to microstructure. Notch tensile tests were conducted in laboratory air at the room temperature, 150, 300 and 450°C. The base metal specimen aged at 426°C formed elongated ¡ precipitates interlocked in a basket-weave like structure and then had peak hardness but inferior notch tensile strength at room temperature due to the trans-granular quasi-cleavage fracture seperated along the ¡/¢ interface in the aged specimen. As the aging and test temperature increased, the coarse Widmanstätten ¡ in the specimen aged at 540°C was facilitated to perform high NTS owing to crack deflection or microcrack formation in Ti-15-3 alloy under 300°C, while the improved ductility and notch blunting of the specimen aged at 426°C reduced the notch brittleness and resulted in a remarkably improved NTS tested at 450°C. The NTS of the specimen aged at 426°C was much higher than that of the other aged specimen tested at 450°C. This result suggested that the basket-weave-like structure was more resistant to the softening of substance than the coarse Widmansttäten structure at 450°C.

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“…[7,8] It is well known that the presence of sharp notches in a material increases the likelihood of cracking or sensitivity under tensile straining. [9,10] In previous studies, sharp notch specimens were used to investigate the effect of microstructure on the notch sensitivity of titanium alloys and welds. [11][12][13] However, little information regarding the mechanical properties of Ti-15-3 welds is available in the literature.…”

Section: Introductionmentioning

confidence: 99%

Notched Tensile and Impact Fracture of Ti-15-3 Laser Welds

Tsay

Chen

2011

Metall Mater Trans A

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The notched tensile strength (NTS) and impact toughness of Ti-15V-3Cr-3Sn-3Al (b-type titanium alloy Ti-15-3) laser welds aged at temperatures ranging from 590 K to 866 K (317°C to 593°C) were determined, and the results were compared to those of unwelded Ti-15-3 plates aged at the same temperature. At a given aging temperature, a precipitates in welded specimens were finer and exhibited higher hardness than those in unwelded specimens. Among the tested specimens, the weld aged at 644 K (371°C) was most susceptible to notch sensitivity. In those welds aged at or above 755 K (482°C), the coarse columnar structure was prone to interdendritic fracture during notched tensile tests, which reduced the NTS of the weld relative to that of the unwelded plate aged at an equivalent temperature. Of the tested specimens, the weld that was not subjected to the postweld aging treatment possessed the highest impact toughness among the specimens.

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The relationship between brittle fracture temperature and stress concentration in bcc steels

Cited by 15 publications

References 2 publications

A new method for determining the fracture toughness of main pipeline steels

A new method for determining the fracture toughness of main pipeline steels

Relationship between Microstructure and Notch Tensile Strength in Ti–15V–3Cr–3Sn–3Al Alloy at Elevated Temperatures

Notched Tensile and Impact Fracture of Ti-15-3 Laser Welds

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The relationship between brittle fracture temperature and stress concentration in bcc steels

Cited by 15 publications

References 2 publications

A new method for determining the fracture toughness of main pipeline steels

A new method for determining the fracture toughness of main pipeline steels

Relationship between Microstructure and Notch Tensile Strength in Ti&ndash;15V&ndash;3Cr&ndash;3Sn&ndash;3Al Alloy at Elevated Temperatures

Notched Tensile and Impact Fracture of Ti-15-3 Laser Welds

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Relationship between Microstructure and Notch Tensile Strength in Ti–15V–3Cr–3Sn–3Al Alloy at Elevated Temperatures