A Thermodynamic Database of Drill Pipe Steel and Its Application in High Strength Drill Pipe Design
A thermodynamic database for drill pipe steel, including Fe, Al, C, Cr, Cu, Mn, Mo, N, Nb, Ni, Si, Ti, V elements, has been developed by the calculation of phase diagrams (CALPHAD) method. The Gibbs free energies of the liquid phases were described by subregular solution model. The Gibbs free energies of the interstitial solid solution (bcc, fcc, cub, cbcc, hcp) and various types of carbonitrides were modeled by sublattice model. The thermodynamic database has been applied to calculate A3 temperature of five drill pipe steel cases, to analyze the phase equilibria and to simulate the secondary phase particles in drill pipe steel. The calculated results show that the present thermodynamic database can provide critical information for heat treatment and components design of drill pipe steel.
KeywordsDrill pipe steel CALPHAD Thermodynamic database Heat treatment
This work was supported by the Innovative training program (KSZ16121) of Southwest Petroleum University, and open fund of Fujian Provincial Key Laboratory of Materials Genome (Xiamen University) and National Natural Science Foundation of China (51374180). The authors acknowledge funding from the Department of Education of Sichuan Province (17ZA0419) as well as scientific research starting project funding (2017QHZ020) of Southwest Petroleum University.
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