The correlation between yielding behavior and precipitation in ultra purified ferritic stainless steels

The Application of a Factorial Experiment with Repeated Measurements in the Investigation of Parameters Influencing the Properties of Niobium Microalloyed Cold Drawn Welded Steel Tubes

“…It is well known that a small addition of a microalloying element with a proper selection of hot rolling parameters results in a significant improvement in the mechanical and technological properties of a rolled product [1][2][3]. The optimal addition of the microalloying element niobium is about 0.05% [4].…”

“…The chemical composition and size of the precipitates are dependent on the deformation temperature and the niobium content in the steel. Precipitates are produced in the form of densely arranged carbonitrides and make a strong obstacle to the dislocation movement [2,3]. In a hot rolled strip, 10 nm precipitates are in interaction with dislocations.…”

“…Therefore, it is necessary to determine the most influential factor at the beginning of the plastic material flow, R p . A factorial experiment consisting of three factors at two levels 2 3 with repeated measurements was used [18][19][20] to determine the most influential parameter. This methodology of planning and analysing the experiment is used to analyse the effects of certain parameters on the output variables of technological and production processes.…”

Effect of Laves Phase on High-Temperature Deformation and Microstructure Evolution in an 18Cr-2Mo-0.5Nb Ferritic Stainless Steel

“…Morrie et al [8] noted that rapid coarsening of the Laves phase at high temperatures significantly reduces strength over 973K(700°C), and Sim et al [9] reported that coarse, rod-shaped Laves phase precipitates (Fe 2 Nb) formed at 973K(700°C) are very detrimental to high-temperature strength of Nbcontaining steels. With regard to practical applications, there are many studies of the thermal and fatigue behavior [10][11][12][13] and the high-temperature deformation behavior [14][15][16][17] of high Cr stainless steels.…”

Influence of Niobium on the Beginning of the Plastic Flow of Material during Cold Deformation

“…There are different interpretations of reasons for appearance of Lüders bands and deformation mechanisms that take place at the same time. It was considered that the main reason for occurrence of Lüders bands is pinning of dislocations on the dissolved C and N atoms and their compounds which form the so-called Cottrell's atmospheres, so dislocations accumulate itself on them [ 6 – 8 ]. These mechanisms are not sufficiently clarified.…”