Influences of crystallography and delamination on anisotropy of Charpy impact toughness in API X100 pipeline steel

Impact toughness of a gradient hardened layer of Cr5Mo1V steel treated by laser shock peening

“…The parameters controlling the impact toughness of the gradient hardened layer are the surface impact toughness, a k 1 , and the gradient, k, for the assumption of linearly gradient distribution of impact toughness during the peened layer. Charpy impact tests are widely used to determine the impact toughness of material [18][19][20]. Figure 4a shows the schematic of fracture of a Charpy specimen at impact load.…”

A study of the mechanism of delamination fracture in bainitic magnetic yoke steel

“…Yang et al [8][9] argued that due to the large volume fraction of {001} planes parallel to the rolling plane, delamination would decrease Charpy impact toughness in API X100 pipeline steel. Mirzaev et al [10] determined that delamination cracks in the ferritic 08Kh18T1 steel were formed in the rolling process under HTMT (High Temperature Thermomechanical Treatment ) as a result of {100} and A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 3 {111} planes being predominantly located in the rolling plane.…”

Relationships among crystallographic texture, fracture behavior and Charpy impact toughness in API X100 pipeline steel

“…Increasing the strength of pipeline steel highly reduces the wall thickness and total weight of pipeline. Hence, a goal within the steel industry is to develop high strength microalloyed pipeline steels [1,11]. Although X100 steel has already been studied and tested for demonstration [12], the production technology is still needed to be further improved and application of this steel is also in the development phase.…”

“…The different cooling rates and cooling temperatures are carried out to develop different API pipeline steel grades. It is noted that TMCP provides the desirable and fine-grained microstructure, and strong textures also develop during the controlled rolling and cooling processes, which is closely related to deformation, recrystallization, and transformation [1,11]. The role of crystallographic textures cannot be ignored because crystallographic textures significantly influence fracture behavior and impact toughness of pipeline steels.…”