Abstract
The numerical simulations of the deformation and fracture in an iron boride coating – steel substrate composition are presented. The dynamic boundary-value problem is solved numerically by the finite-difference method. A complex geometry of the borided coating – steel substrate interface is taken into account explicitly. To simulate the mechanical behavior of the steel substrate, use is made of an isotropic strain hardening model including a relation for shear band propagation. Local regions of bulk tension are shown to arise near the interface even under simple uniaxial compression of the composition and in so doing they determine the mesoscale mechanisms of fracture. The interrelation between plastic deformation in the steel substrate and cracking of the borided coating is studied. Stages of shear band front propagation attributable to the interface complex geometry have been revealed. The coating cracking pattern, location of the fracture onset regions and the total crack length are found to depend on the front velocity in the steel substrate.
Highlights
Control over the properties of the surface layer plays an important role in designing modern materials
In our earlier work (Balokhonov et al 2006, 2009, 2019, 2021), we studied phenomena related to irregular interface geometry effects
We have investigated the convergence of the numerical solution for the Lüders band propagation
Summary
Control over the properties of the surface layer plays an important role in designing modern materials. Coating deposition technologies are widely used in civil engineering, gas and oil industry and agriculture for reconditioning machine parts and devices. Special attention is given to materials for microelectronics, where surface oxidation initiates multiple cracking. The remedy is coating deposition to prolong the service life of components. The most popular structural materials have been surface hardened steels. Certain types of steels exhibit an unstable behavior evident as intermittent yielding. Experimental stress-strain curves for steels (NematNasser and Guo 2005, Balokhonov and Romanova 2021, Ren et al 2021) are characterized by upper and lower yield stresses, which bear witness to Lüders band propagation
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