The influence of aluminium nitride on the hot ductility of ultra high purity steels

Heritier, P.; Fourdeux, A.; Kobylanski, A.

doi:10.1016/0036-9748(81)90014-4

Cited by 19 publications

(5 citation statements)

References 5 publications

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“…On the other hand, precipitation of AlN can cause embrittlement and induce cracking phenomena, such as rock candy fracture [6][7][8][9][10][11][12]. Some authors [13] report that AlN without any other trace element has no influence on the hot ductility of high purity iron. The most significant effect of AlN in steel is in grain size control [3,[14][15][16], which directly influences these properties.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of AlN precipitation in microalloyed steel

Radis

Kozeschnik²

2010

Modelling Simul. Mater. Sci. Eng.

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In this work, the thermodynamic information on AlN formation in steel and experimental data on AlN precipitation kinetics are reviewed. A revised expression for the Gibbs energy of AlN is presented with special emphasis on microalloyed steel. Using the software package MatCalc, computer simulations of AlN precipitation are performed and compared with independent experimental results from the literature. A new model for grain boundary precipitation is employed, which takes into account fast short-circuit diffusion along grain boundaries as well as slower bulk diffusion inside the grain, together with the classical treatment for randomly distributed precipitates with spherical diffusion fields. It is demonstrated that the precipitation of AlN can be modelled in a consistent way if precipitation at grain boundaries and dislocations is taken into account, dependent on chemical composition, grain size and annealing temperature. It is also demonstrated that, for consistent simulations, the influence of volumetric misfit stress must be taken into account for homogeneous precipitation of AlN in the bulk and heterogeneous precipitation at dislocations.

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Section: Introductionmentioning

confidence: 99%

Kinetics of AlN precipitation in microalloyed steel

Radis

Kozeschnik²

2010

Modelling Simul. Mater. Sci. Eng.

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“…: +82 33 250 6267; fax: +82 33 250 6260. Some investigations [6], by contrast, have reported that AlN has no influence on the hot ductility of steel. The most significant effect of AlN in steel is grain-size control [7,8], which directly influences mechanical properties.…”

Section: Introductionmentioning

confidence: 91%

Structural characterization of nano-scale precipitates in Cu bearing extra-low-carbon steels

Lee¹,

Kim²,

Hong³

et al. 2011

Journal of Alloys and Compounds

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“…Nitrides also have been examined as potential cavity nucleation sites in iron. Heritier et al [42] and Tacikowski et al [43] showed that AlN particles nucleate cavities during high-temperature tensile deformation only if there is sufficient S present in the alloy. Therefore, AlN particles, as such, are not deleterious, but their combination with S ± ± which, presumably, weakens the AlN±Fe interface ± ± is very deleterious.…”

Section: Trace Element Effects In Ironmentioning

confidence: 99%

Review of Trace Element Effects on High-Temperature Fracture of Fe- and Ni-Base Alloys

George¹,

Kennedy²,

Pope³

1998

phys. stat. sol. (a)

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Trace elements can have harmful or beneficial effects on elevated‐temperature mechanical properties. In iron and low‐alloy steels, S at high concentrations forms sulfides which are potent nucleation sites for intergranular creep cavities. As a result, ductility decreases and fracture becomes increasingly intergranular with increasing S concentration. Oxides and nitrides nucleate cavities only in the presence of segregated S; by themselves they are relatively benign. The harmful effects of S can be ameliorated by the addition of carbon and phosphorus. It is unclear whether C and P have beneficial effects of their own, or whether they act merely by counteracting the negative effects of sulfur. Carbides almost never nucleate cavities. In Ni‐base alloys, too, S is deleterious, and alloying with strong sulfide getters increases ductility and rupture life. Boron and P interact synergistically and increase stress rupture lives in some alloys but not in others. The detailed mechanism of this interaction is not well understood.

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The influence of aluminium nitride on the hot ductility of ultra high purity steels

Cited by 19 publications

References 5 publications

Kinetics of AlN precipitation in microalloyed steel

Kinetics of AlN precipitation in microalloyed steel

Structural characterization of nano-scale precipitates in Cu bearing extra-low-carbon steels

Review of Trace Element Effects on High-Temperature Fracture of Fe- and Ni-Base Alloys

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