Creep Deformation and Dynamic Grain Growth in an Interstitial-Free Steel

Abstract

Dynamic grain growth is demonstrated to be much faster than static grain growth in a body-centered-cubic, interstitial-free steel sheet material at 850 C. Dynamic grain growth occurs during concurrent plastic deformation at elevated temperature, whereas static grain growth occurs during static annealing. Grain growth during steady-state plastic flow in tension at 850 C to a true strain of 0.2 at a true-strain rate of 10 À4 s À1 doubled grain size, while static annealing for the same time produced no increase in grain size. This is described as dynamic normal grain growth (DNGG) because no abnormally large grains were observed. The recrystallized microstructure of the steel demonstrated a log-normal distribution of grain sizes. DNGG produced bimodal grain size distributions that deviate from the theoretical expectation of a simple shift to larger sizes during normal growth. The bimodal distributions contained a remnant of small grains that were not consumed during grain growth. DNGG produced a crystallographic texture that is unique from both the recrystallized material and that produced by lattice rotation alone. DNGG strengthened the f111gh110i and f111gh112i components of the strong c-fiber component in the original recrystallization texture. Lattice rotation from tensile deformation, by contrast, strengthened the a-fiber components that intersect the original c-fiber.

Non-transferring arc and wire additive manufacturing: microstructure, mechanical properties and bulk texture evolution of deposits

“…The enhancements in the degree of recrystallisation and grain refinement strengthen the ϒ-fibre development more than ζ-fibre. Past research studies by Dwivedi et al (2022a), Jamaati et al (2014) and Rupp et al (2020) also point out the ϒ-fiber development because of recrystallisation and grain refinement. From the texture intensity plot (Figure 28), the {111}<112> texture component of ϒ-fiber and {011}<100> of ζ-fiber has a higher intensity in the top section than middle and bottom sections of the deposit.…”

“…To understand the development of different kinds of fibre textures and their distinctive components, orientation distribution function (ODF) is necessary. Factors such as recrystallisation, temperature distribution, stress/strain accumulation, deformation path, type and degree of deformation were responsible for triggering a specific fibre texture in the material (Dwivedi et al , 2022a; Gondo et al , 2021; Jamaati et al , 2014; Rupp et al , 2020). Based on the diffraction patterns, the crystal symmetry of initial wire and deposits belongs to the body-centered cubic (BCC).…”

“…To understand the development of different kinds of fibre textures and their distinctive components, orientation distribution Gondo et al, 2021;Jamaati et al, 2014;Rupp et al, 2020). Based on the diffraction patterns, the crystal symmetry of initial wire and deposits belongs to the body-centered cubic (BCC).…”

Texture Evolution by Strain-Induced Boundary Migration during Hot Deformation of Fe-3.0 wt.% Si Alloy: Experiment and Modeling

“…The texture evolution during hot deformation results from the crystal orientation rotation [10,11], as well as the formation and migration of high-angle grain boundaries [12][13][14], which is closely related to initial texture and deformation parameters. The difference in stored strain energy between adjacent deformed grains has a great effect on texture evolution in terms of strain-induced boundary migration (SIBM) [15,16].…”