Plastic flow of Fe-binary alloys—II. Application of the description to the ductile-brittle transition

Gerberich, William W.; Chen, Y. T.; Atteridge, D.G.; Johnson, Timothy W.

doi:10.1016/0001-6160(81)90069-9

Cited by 37 publications

(12 citation statements)

References 16 publications

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“…These potentials are denoted herein as Mendelev-II [9] and Mendelev-IIext. [8] The EAM potential is invariant to the following transformations: [14,15] f i ðr ij Þ0sf i ðr ij Þ Fðr i Þ0Fðr i =sÞ [2] Fðr i Þ0Fðr i Þ 1 qr i V pair ðr ij Þ0V pair ðr ij Þ À 2qfðr ij Þ [3] where s and q are arbitrary constants. When q is chosen to be the derivative of the embedding energy evaluated at the perfect lattice electron density, q 5 ÀF9(r 0 ), the transformation of Eq.…”

Section: B Potentialsmentioning

confidence: 99%

“…[1,2,3] For these bcc metals, it is generally assumed that the yield stress of the material is controlled by the stress required to move screw dislocations, and the ductile-to-brittle transition temperature is sensitive to the strong temperature dependence of the screw dislocation motion. The precise mechanisms that explain this dependence are not well understood, although the presence of dissolved impurities is hypothesized to play a role.…”

Section: Introductionmentioning

confidence: 99%

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Crack-Tip Deformation Mechanisms in α-Fe and Binary Fe Alloys: An Atomistic Study on Single Crystals

Gordon,

Neeraj,

Luton

et al. 2007

Metall Mater Trans A

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Molecular statics simulations are employed using semiempirical interatomic interaction potentials to examine the near crack-tip deformation mechanisms in iron and iron alloy single crystals under pure mode-I loading. The deformation mechanisms are found to be strong functions of the crack orientation. For pure Fe systems, the sensitivity of the overall response is explored by comparing the behavior of a number of recently developed potentials. The competition between ductile and brittle responses is interpreted between the well-known Griffith and Rice criteria, but is found to be lacking in predicting a priori the qualitative failure mechanism near the crack tip. The influence of Ni and Cr additions as ordered substitutional solutes is probed at concentrations up to 9.375 at. pct, and several qualitative differences in crack-tip behavior are observed.

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Section: B Potentialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crack-Tip Deformation Mechanisms in α-Fe and Binary Fe Alloys: An Atomistic Study on Single Crystals

Gordon,

Neeraj,

Luton

et al. 2007

Metall Mater Trans A

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“…1 and 2 in Ref. (8). The absorbed energy in each alloy exhibits abrupt increase at a certain temperature, indicating the sharp transitions of fracture modes from a brittle manner to a ductile one, which is commonly seen in ferritic steels.…”

Section: -7)mentioning

confidence: 85%

The Increase in a Brittle-to-ductile Transition Temperature in Fe–Al Single Crystals

et al. 2011

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The effect of aluminium concentration on a brittle-to-ductile transition (BDT) has been investigated in Fe-Al single crystals. The BDT temperatures in Fe-4mass%Al and Fe-8mass%Al crystals with <100> specimen axis were measured by an instrumental falling weight impact tester, indicating that the BDT temperature in Fe-8%Al is higher than that in Fe-4%Al. Twin-twin intersections were seen on fracture surfaces in Fe-8%Al tested at low temperatures, which shows that the intersection was the origin of a brittle fracture. In order to highlight the effect of deformation twinning on the BDT behaviour, specimens with the <110> axis were also employed to suppress the onset of deformation twinning during the impact tests. The BDT temperature in Fe-8%Al was found to be decreased by suppressing deformation twinning, which indicates that deformation twinning is a key mechanism behind increasing the BDT temperature in Fe-Al single crystals. A model to explain the increase in the BDT temperature with aluminium content is also presented.

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“…al. [14] observed for binary Fe-Si alloys a decrease in cleavage fracture stress and an increase in effective fracture surface energy when the silicon content is decreased. This was attributed to an increase of DBTT by 74 K at 4 at.…”

Section: Introductionmentioning

confidence: 88%

Mechanical Properties and Impact Toughness of Nickel and Aluminum Alloyed High Silicon Ductile Iron

Weiß

Riebisch

Bührig–Polaczek

2018

MSF

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Abstract. High silicon grades of ductile cast iron are known to be highly advantageous in regard to technically relevant properties and economic efficiency. In particular, the outstanding mechanical properties lead to an increasing demand since 2011, the year of incorporation to the EN 1563 standard. However, low impact resistance and spontaneous failure are concerns that limit the application, especially at lower temperatures. Silicon serves as a solid solution strengthener. By the addition of cobalt, aluminum and nickel as additional solid solution strengthener, an improvement in mechanical properties compared to silicon alone could be obtained. Previous studies showed that the addition of 1.5 wt.% Ni to an EN-GJS-500-14 grade with 3.8 wt.% Si resulted in a tensile strength of 650 MPa at 15 % elongation. In the present study, silicon was substituted stepwise by nickel and aluminum, simultaneously aiming at the retention of the mechanical properties of the EN-GJS-500-14 grade. By decreasing the silicon content to 3.3 wt.% Si at 1.1 wt.% Ni and 0.2 wt.% Al, EN-500-14 was obtained. Even though, the presence of pearlite in the matrix was observed, this substitution of silicon led to an increase in Charpy-V-notch toughness by 4 joules at room temperature. For further alloy design of high silicon ductile cast iron for simultaneously substituting silicon and improving the mechanical properties and notch toughness, the restrictions for pearlite formation must be complied.

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Plastic flow of Fe-binary alloys—II. Application of the description to the ductile-brittle transition

Cited by 37 publications

References 16 publications

Crack-Tip Deformation Mechanisms in α-Fe and Binary Fe Alloys: An Atomistic Study on Single Crystals

Crack-Tip Deformation Mechanisms in α-Fe and Binary Fe Alloys: An Atomistic Study on Single Crystals

The Increase in a Brittle-to-ductile Transition Temperature in Fe–Al Single Crystals

Mechanical Properties and Impact Toughness of Nickel and Aluminum Alloyed High Silicon Ductile Iron

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