Phase Transformation Crystallography in Pipeline HSLA Steel after TMCP

Thermo-mechanical controlled processing (TMCP) is employed to obtain the required level of mechanical properties contemporary high-strength low-alloy (HSLA) steel plates utilized for gas and oil pipeline production. The strength, deformation behavior resistance formation propagation running fractures are mainly determined by its microstructure crystallographic texture. These formed as a result austenite consequent γ→α-transformation. This present study analyses regularities structural textural state in plate that has been industrially produced means TMCP. values have measured different directions demonstrate significance texture failure products. An electron backscatter diffraction (EBSD) method analysis were establish connection between main components deformed α-phase orientations. paper demonstrates due multipath γ→α-transformation results from nucleation on special boundaries grains with γ-phase spectra α-γ-interface boundary angle deviations Kurdjumov–Sachs (K–S), Nishiyama–Wassermann (N–W), Greninger–Troiano (G–T) orientation relationships (ORs) allows suggest observed particles represent secondary (not retained) precipitates at intercrystalline correspond ORs regard only one adjacent crystallite.