Influence of microalloying elements (Ti, Nb) and nitrogen concentrations on precipitation of pipeline steels—A thermodynamic approach

• Published in: Engineering reports (Hoboken, N.J.) N.J.), 2021-07, Vol.3 (7), p.n/a
• Main Author: Aminorroaya Yamini, Sima
• Format: Article
• Language: English
• Subjects: CALPHAD; Carbon; carbonitrides; Chemical composition; Chemical precipitation; Chemical properties; Complex systems; Corrosion resistance; Design of experiments; Equilibrium; Grain boundaries; Grain growth; Heat treatment; Heating; High carbon steels; High strength low alloy steels; Hot rolling; Low carbon steels; Mathematical analysis; Mechanical properties; microalloyed steel; Microalloying; niobium; Niobium carbonitride; nitrides; Nitrogen; Phase diagrams; pipeline steel; Pipelines; Precipitates; Precipitation hardening; Production costs; Recrystallization; Software packages; Steel; Structural steels; Temperature; Thermomechanical treatment; Titanium
• ISSN: 2577-8196; 2577-8196
• DOI: 10.1002/eng2.12337

A CALculation of PHase Diagrams (CALPHAD) approach was used to study the precipitation of nitrides and carbonitrides in pipeline steels, aligned with new developments of complex chemical compositions and thermomechanical processing of High Strength Low Alloyed (HSLA) Steels. This is in response to growing demand for improved mechanical and chemical properties, manufacturing flexibility and reduced production cost. The calculated results indicated that the precipitation temperatures of nitrides in Ti‐Nb microalloyed steels increased by titanium concentration, while the niobium concentration significantly increased the precipitation temperature of niobium carbonitrides. Carbonitride precipitates formed at much lower temperatures (∼100 K) in low carbon steels (0.1 wt%), suggesting precipitates larger in size. This is in good agreement with independent experimental data from the literatures, where austenite grain growth was studied in similar steel compositions. Although the dissolution and growth of precipitates are controlled kinetically, these results proved that the thermodynamic calculation can efficiently predict compositions and sequence of precipitation in chemically complex systems, guiding more accurate designs of experiments to identify critical temperatures of grain coarsening during reheating, recrystallisation during hot rolling, and transformation during cooling. This can minimize the number of tests required to obtain optimum chemical compositions and heat treatment procedures. A calculated thermodynamic approach was used to study the formation temperatures of nitride and carbonitride precipitates in pipeline steels, showing good agreement with relevant experimental data. Although the dissolution and growth of precipitates are controlled kinetically, this results in a more accurate design of experiments, minimizing the number of tests required to obtain optimum chemical compositions and heat treatment procedures.