Microstructural formation, deformation behaviour and deformability of heat treatment steels in the two-phase region

Chabbi, Lotfi; Lehnert, W.

doi:10.1051/metal/200097050589

Cited by 1 publication

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“…Intercritical rolling is usually applied in thick plate thermomechanical rolling in order to achieve tensile property improvement in plain carbon and micro-alloyed steels [1][2][3][4][5]. Intercritically deformed microstructures have a beneficial impact on both yield and tensile strength, although ductility is significantly impaired [1,4,5]. The formation of different ferrite populations (deformed and non-deformed ferrite) also contributes to a reduction in hardness properties [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Strain Partitioning in Intercritically Deformed Microstructures via Interrupted Tensile Tests

Mayo

Isasti

Rodríguez-Ibabe

et al. 2021

Metals

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Intercritically deformed steels present combinations of different types of ferrite, such as deformed ferrite (DF) and non-deformed ferrite (NDF) grains, which are transformed during the final deformation passes and final cooling step. Recently, a grain identification and correlation technique based on EBSD has been employed together with a discretization methodology, enabling a distinction to be drawn between different ferrite populations (NDF and DF grains). This paper presents a combination of interrupted tensile tests with crystallographic characterization performed by means of Electron Backscatter Diffraction (EBSD), by analyzing the evolution of an intercritically deformed micro-alloyed steel. In addition to this, and using the nanoindentation technique, both ferrite families were characterized micromechanically and the nanohardness was quantified for each population. NDF grains are softer than DF ones, which is related to the presence of a lower fraction of low-angle grain boundaries. The interrupted tensile tests show the different behavior of low- and high-angle grain boundary evolution as well as the strain partitioning in each ferrite family. NDF population accommodates most of the deformation at initial strain intervals, since strain reaches 10%. For higher strains, NDF and DF grains behave similarly to the strain applied.

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