The final microstructure and subsequent properties of pipeline steel have been shown to be highly dependent of both the controlled rolling conditions and accelerated cooling conditions. This research utilized a novel physical deformation simulator to evaluate the evolution of microstructure in an X-70 and an X-100 grade pipeline steel during finish hot deformation and cooling. A series of plane strain compression (PSC) tests have been designed to simulate the processes of plate rolling and strip rolling, with the influence of finishing temperature and cooling rate being of particular interest. Single and multi-pass reductions at a constant strain rate of 70 s −1 , together with constant delay times were used in this work. A total of three different deformation temperatures, namely, 950 C, 900 C, and 850 C were used for the present experiments, in which multipass isothermal deformation took place. Additionally, multipass deformation took place under non-isothermal conditions (i.e., descending temperature processing). Microstructures were characterized optically, and micro-hardness were obtained from the as-deformed PSC specimens. Analyses from the microstructural characterization together with the results from mechanical testing will reveal the optimal processing-microstructure-properties window for this important engineering alloy.

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The existing work characterizes the consequence of Zinc increase of the precise structure, thermal and mechanical characteristic of Aluminum by supplement 60% Zinc and 10 % Zinc to fine Aluminum alloy to gained Zinc-40Aluminium and Zinc-90Aluminium. The study presented that the superplasticity of Zinc-90Aluminium is reduced compared with Zinc-40Aluminium. The strain rate (SR;  . ) and temperature (T) are having extremely influence on tensile figure. Too (SR;  . ) and (T) donate excellent Young's modulus (Y), ultimate tensile stress (UTS), yield stress (σ y ), and breaking strength σ f associated with the exponent rule Stress =constant strain •m , where m is strain average susceptibility index; while strain rate and temperature decrease fracture strain (ε f ). The tensile figures are (T) and (SR; ε•) dependence. Stress-strain characteristics of Zinc-40Aluminium and Zinc-90Aluminium alloys were investigated at various strain rates (SR, ε•) from 0.0005.0 to 0.006.4 1/sec. and deformation temperatures ranging from 25 to 120 celsius. In case of Zinc-90Aluminium; it has higher ultimate tensile stress (UTS) i.e. Zinc-40Aluminium is more in elongation (ductility) than Zinc-90Aluminium. A common decrease of strain ε T with (SR; ε•) is characterized by the equation ε T =Aexp(-λε •m ); A and λ are constant. The results depend on variation precise structure. The Zinc supplement from 10% to40% refines the precise structure, enhancing the mechanical properties, and form increase the ductility.