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This article deals with the composition design of a novel P-containing transformation-induced plasticity (TRIP) steel grade on basis of the thorough thermodynamic analysis. The influence of P on the equilibrium phases and phase transformations in a potential TRIP steel grade Fe-0.2 C-(0.0–0.8) P-1.5 Mn-0.4 Si (mass %) has been investigated by assuming that a full thermodynamic equilibrium can be reached in the system. The phases involved are liquid, δ-fer-rite, austenite, α-ferrite, θ-carbide and phosphide (Fe 3 P), and the phase transformations discussed include solidification, properitectic, peritectic, proeutectoid, eutectoid, θ-carbide and phosphide precipitation from both ferrite and austenite. It is shown that P promotes the precipitation of phosphide within austenite or ferrite. The former is regarded as a limitation on the intercritical annealing while the later is thought to be beneficial to the strength of the ferritic component of the microstructure. The effects of P on other phase transitions in this system are more complicated and most of the effects are detrimental. Thus, it is better to keep the P content as low as possible. Based on the analyses of the presence of various equilibrium phases and the occurrence of different phase transformations in the current system, it is concluded that the optimum P concentration for a prospective P-containing steel grade is about 0.2–0.25 mass %.

Theoretical Study of P-Containing Transformation-Induced Plasticity Steel – Part 1: Determination of the Phosphorus Concentration