In materials science, grain-boundary strengthening (or Hall–Petch strengthening) is a method of strengthening materials by changing their average crystallite (grain) size.

Grain-boundary strengthening (or Hall–Petch strengthening) is a method of strengthening materials by changing their average crystallite (grain) size. The strength of metals and alloys can be modified through various combinations of cold working, alloying, and heat treating.

2004年10月1日 · The Hall–Petch relation is discussed separately for the yield stress of undeformed polycrystalline metals and for the flow stress of deformed metals. Key structural parameters are the boundary spacing, between grain boundaries in the former case and between dislocation boundaries and high angle boundaries in the latter.

Grain boundary strengthening (or Hall-Petch strengthening) is a method of strengthening materials by changing their average crystallite (grain) size.

Strengthening Mechanism (Hall-Petch Effect): As the grain size decreases, the number of grain boundaries increases, which can impede the motion of dislocations. This phenomenon is known as the Hall-Petch effect, which states that materials with smaller grains tend to be stronger, as grain boundaries act as barriers to dislocation movement.

Grain Boundary Strengthening. Strength of a material can be increase by reducing the average crystallite (grain) size of the material. During nucleation and growth, each crystal or grain grow separately as solidification occures, and they have different orientations while growing.

Grain boundary area (and therefore energy) is. Strength is increased by making dislocation motion difficult. Particular ways to increase strength are to: Heating (annealing) can reduce dislocation density and increase grain size.

2024年1月5日 · DD simulations are performed to unravel the coupled effects between grain boundary strengthening and Orowan strengthening. With the simulations of a plastically-deformed grain embedded in elastic matrix, the internal stresses associated with inter- and intragranular obstacles are quantified.

In fine-grained steels the effect of the barrier mechanism of grain boundary strengthening is negligible, while the effect of grain boundaries on resistance to deformation described by the Hall—Petch equation is manifest indirectly through the effect of strain hardening with a more rapid increase of dislocation density. 3.

Grain boundary strengthening provides benefits both in terms of fracture toughness and mechanical behavior at lower temperatures particularly in case of hot rolled high strength structural and line pipe steels.