Abstract
This chapter deals with brittle fracture especially by cleavage and embrittlement by segregation of impurities at grain boundaries or by irradiation.
Cleavage follows specific crystallographic planes in metals. A criterion gives the tendency for cleavage versus intergranular fracture. The conditions for crack tip blunting allow writing another criterion indicating the tendency for intrinsic brittleness. Owing to the very high value of the theoretical fracture stress, local stress raisers are needed to explain cleavage initiation: they are various defects in ceramics, dislocation pile-ups and inclusions in metals. Other obstacles, such as grain boundaries must be overcome for cleavage crack propagation. The Beremin model based on the analysis of Weibull accounts for the statistical nature of cleavage. The theory of Batdorf introduces the effect of the crack orientations. Care is needed to insure the validity of the models. They are extended to fracture toughness, in small scale yielding as well as in large scale yielding. The way to obtain the parameters of the models is described. In applications to steels, the presence of multiple barriers needs to be introduced in the modelling. It is necessary to take account of dynamic and of stress triaxiality effects. The Beremin model was applied to bainitic steels, and adapted to include plasticity. The fracture toughness of steels is statistically distributed and shows size effects. Loading rate and prestraining effects, warm prestraining effect, effect of inhomogeneities, especially in welds, are described and modelling discussed. Description of cleavage in other BCC metals as well as in HCP zinc and magnesium are given.
Temper embrittlement of steels results from the segregation of impurities to the grain boundaries. The thermodynamics and kinetics models of this segregation are discussed. The embrittlement is explained by the modifications of the boundary and surface energies due to this segregation. It influences also the conditions for intrinsic brittleness as opposed to crack blunting. Examples of temper embrittlement of steels are given. Overheating of steels is another phenomenon producing intergranular fracture.
Irradiation hardens metals and produces a shift of the DBT temperature. Impurities play a major role in this phenomenon. It is possible to model this shift.
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Notes
- 1.
Fracture toughness, which is introduced here simply to show the existence of a threshold, is discussed later.
- 2.
The far-field stresses are written in uppercase letters in order to distinguish them from local stresses.
- 3.
Here Σ designates a type of coincidence site lattice and not a macroscopic stress. For the definition of Σ in bicrystals see e.g.; Priester (2006). Σ is an odd integer number in cubic crystallographic structures. Similarly here θ is the tilt angle between two neighbouring grains.
- 4.
Irving Langmuir (1881–1957) was an American chemist and physicist. He was awarded the 1932 Nobel Prize in chemistry for his work in surface chemistry. He was the first industrial (General Electric) chemist to become a Nobel laureate.
- 5.
- 6.
Several relationships were proposed to relate the irradiation damage expressed in terms of fluence (n/cm2) to the number of displacements per atom (dpa) (see e.g. Guionnet et al. 1982).
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François, D., Pineau, A., Zaoui, A. (2013). Brittle Fracture. In: Mechanical Behaviour of Materials. Solid Mechanics and Its Applications, vol 191. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-4930-6_3
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