Splitting of pipe steel produced by TMCP

Evolution of microstructure in stainless martensitic steel for seamless tubing

“…Quenching of overcooled austenite leads to the formation of martensite with its inherent set of texture components, and so on. A similar mechanism of texture evolution during phase transformations [12] assumes that there are some factors responsible for heredity in the structure of the material after HD. According to [10,13], the reasons may be special boundaries Σ3 and Σ11 between the deformed austenite grains formed due to hot deformation, the relative arrangement of which in the material structure is additionally pinned by precipitates of carbide phases.…”

Effect of Structure and Texture on Failure of Pipe Steel Sheets produced by TMCP

“…It should be noted that, taking into account the crystal-geometric characteristics of structurally ferrite (orientation, shape and size of grains), it can be considered as a kind of "macro defect". Propagation of longitudinal cracks will be predetermined in the crystallographic planes {001} of elongated ferrite grains [7,10].…”

“…In [6], reasons for forming cleavages in high-strength pipe steels with a bainitic structure, low content of carbon and harmful impurities are also connected with preferred crystallographic texture. In the destruction of pipe steel sheets, an important role is played not by the integral texture but by a single weak component (001) [110], as shown in [7][8][9][10]. Crack development depends on the presence of extended regions with consistent orientation over a distance exceeding the critical crack size.…”

Hot-Rolled Texture of FCC and BCC Metals

“…Hot deformation of metals is accompanied by changing of their geometrical dimensions and formation of the texture state [1][2][3]. This texture significantly influences the orientation-dependent properties of the finished product [4][5][6][7][8] during subsequent treatments (annealing, deformations) through the mechanisms of heredity [9]. As a result, one needs to obtain integrated information about the evolution of the texture state in the process of material production.…”