Intergranular fracture in 4340-type steels: Effects of impurities and hydrogen

Banerji, Samir K.; McMahon, C.J.; Feng, H. C.

doi:10.1007/bf02646706

Cited by 246 publications

(51 citation statements)

References 10 publications

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“…A number of studies [14][15][16][17][18][19][20][21] have been performed on the tempered martensite embrittlement of low-alloy steels. There are two different results in the works: One group [14][15][16][17][18] has suggested that the temper embrittlement is attributed to the segregation of phosphorus at prior austenite grain boundaries, while the other group [19][20][21] insisted that the segregation of sulfur at austenite grain boundaries causes the temper embrittlement.…”

Section: (D) It Is Observed Inmentioning

confidence: 99%

“…There are two different results in the works: One group [14][15][16][17][18] has suggested that the temper embrittlement is attributed to the segregation of phosphorus at prior austenite grain boundaries, while the other group [19][20][21] insisted that the segregation of sulfur at austenite grain boundaries causes the temper embrittlement. Noticeable points in their works are that the composition of the steels used in the works are different from work to work, and that the tempering temperatures are also different in a wide range from 250°C to 700°C.…”

Section: (D) It Is Observed Inmentioning

confidence: 99%

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Effect of Thermal Cycling on Microstructures and Mechanical Properties of Lath and Lenticular Martensites in Fe-Ni Alloys.

et al. 2001

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Effects of thermal cycling on the microstructures and mechanical properties of Fe-15%Ni and Fe-31%Ni alloys having lath and lenticular martensite, respectively, have been studied. The average width of laths in lath martensite of Fe-15%Ni alloy decreased with the increase in number of thermal cycles, and the width of internal twins in lenticular martensite of Fe-31%Ni alloy also decreased with thermal cycling. The hardness of martensite increased up to 3 thermal cycles in Fe-31%Ni alloy, over which it remained constant. On the other hand, the hardness of martensite in Fe-15%Ni alloy increased up to 1 cycle, and remained nearly constant on further cycles. The tensile strength of martensite in Fe-31%Ni alloy increased up to 3 cycles, showing a similar tendency of the hardness variation. However, the tensile strength of martensite in Fe15%Ni alloy decreased with increasing the number of thermal cycles in spite of the increase in hardness with thermal cycling. The reason is that no strain hardening occurred in the thermal-cycled specimens owing to the brittle fracture due to the segregation of sulfur at prior austenite grain boundaries.

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Section: (D) It Is Observed Inmentioning

confidence: 99%

Section: (D) It Is Observed Inmentioning

confidence: 99%

Effect of Thermal Cycling on Microstructures and Mechanical Properties of Lath and Lenticular Martensites in Fe-Ni Alloys.

et al. 2001

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“…The latter may allow the additional benefit of eliminating manganese from steels thereby improving resistance to stress corrosion and hydrogen embrittlement [24].…”

Section: Thermodynamic Stability Of Compounds In Steelsmentioning

confidence: 99%

Grain-Coarsening Resistance and the Stability of Second-Phase Dispersions in Rapidly Solidified Steels

Olson¹,

Ling²,

Montgomery³

et al. 1981

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“…10,11) In contrast, some papers asserted that grain size did not notably affect the thresholds for crack growth. 12,13) Moreover, there have been no reports published to our knowledge on the effect of grain size on HEE in high-pressure gaseous hydrogen.…”

Section: Introductionmentioning

confidence: 99%

Effects of Grain Size on Hydrogen Environment Embrittlement of High Strength Low Alloy Steel in 45 MPa Gaseous Hydrogen

et al. 2010

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The effect of grain size on the susceptibility of high-strength low alloy steels to hydrogen environment embrittlement in a 45 MPa gaseous hydrogen atmosphere was examined in term of the hydrogen content penetrating the specimen during the deformation. Notch tensile tests were performed in a 45 MPa hydrogen environment using specimens with different prior austenite grain size numbers varying from 2.5 to 5.4. The hydrogen content was measured by thermal desorption analysis with a quadrupole mass spectrometer before and after the tensile test. The fracture stress of the notch tensile test increased with increasing grain size number; this showed that grain refinement was effective in reducing the susceptibility of the specimens to hydrogen environment embrittlement in a high-pressure hydrogen atmosphere. The addition of nickel did not affect the fracture stress. A remarkable increase in the content of diffusive hydrogen was observed after the notch tensile test. Assuming that part of the diffusive hydrogen desorbed from grain boundaries, it can be inferred that grain refinement can reduce the mass of hydrogen in the unit grain boundary area, and the susceptibility to high-pressure hydrogen environment embrittlement.

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Intergranular fracture in 4340-type steels: Effects of impurities and hydrogen

Cited by 246 publications

References 10 publications

Effect of Thermal Cycling on Microstructures and Mechanical Properties of Lath and Lenticular Martensites in Fe-Ni Alloys.

Effect of Thermal Cycling on Microstructures and Mechanical Properties of Lath and Lenticular Martensites in Fe-Ni Alloys.

Grain-Coarsening Resistance and the Stability of Second-Phase Dispersions in Rapidly Solidified Steels

Effects of Grain Size on Hydrogen Environment Embrittlement of High Strength Low Alloy Steel in 45 MPa Gaseous Hydrogen

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