Simulation based microstructural optimization of thermo‐mechanically treated steel components

Abstract

A simplified approach for the simulation based estimation of the phase distribution in a thermo-mechanically treated steel component is presented. A key aspect of the approach is the time-temperature relation for each volume element. Based on a forming simulation with a commercial tool the numerically calculated temperature evolution in the component is analyzed with an in-house code. The code allows estimating the local phase distribution after the forming process with the help of the continuous-cooling-diagram of the material used. A first validation fits well with the existing phase distribution in the component, even though the phase transition in the component is critical in terms of time, deformation and local chemical composition of the material used.

Evaluation of fatigue life of steel using steel grain size

“…Many years of materials research conducted by scientists worldwide have shown that many of the properties of metallic materials, especially mechanical, and material susceptibility to technological treatments depend on the internal microstructure of the material. Professional literature includes papers on the effect of the material microstructure on fatigue life and microstructural optimization . So far, the topic of estimating the fatigue life based on the differences in the microstructure of a pair of materials has not been well understood and described in the literature.…”

“…In , the authors mainly base on the assessment of the structure homogeneity: a uniform grain size, a possible segregation of phases in multiphase structures, and finally, the absence or presence of defects in materials.…”