Effect of fatigue-mediated secondary microcrack on crack resistance of twinned materials

In situ experimental study on fracture toughness and damage mechanism of TiB2‐reinforced steel matrix composites

“…On the downside, hot rolling processing caused initial fracture of a certain amount of primary TiB 2 particles in the SMC, which worsened with increasing particle content. These primary particle cracks will growth with the main cracks, accelerating the crack propagation rate, thus reducing the fracture resistance of the material 49,50 . It is also the main reason that the fracture toughness of 13 vol% hot‐rolled SMC is lower than that of 9 vol% hot‐rolled SMC, although the grain size of their matrix is similar.…”

“…These primary particle cracks will growth with the main cracks, accelerating the crack propagation rate, thus reducing the fracture resistance of the material. 49,50 It is also the main reason that the fracture toughness of 13 vol% hot-rolled SMC is lower than that of 9 vol% hot-rolled SMC, although the grain size of their matrix is similar.…”