Ti-V-Mo復合微合金鋼中(Ti, V, Mo)C在γ/α中沉淀析出的動力學

Ti-V-Mo復合微合金鋼中(Ti, V, Mo)C在γ/α中沉淀析出的動力學Kinetics of (Ti, V, Mo)C Precipitated in γ/α Matrix of Ti-V-Mo Complex Microalloyed Steel

根據多元復合析出相的固溶析出理論和典形核長大動力學理論，理論計算了Ti-V-Mo復合微合金鋼中(Ti, V, Mo)C在奧氏體(γ)和鐵素體(α)中沉淀析出的形核參量、析出-時間-溫度（PTT）曲線、形核率-溫度（NrT）曲線，并探討了奧氏體中形變儲能和形變誘導析出量對(Ti, V, Mo)C在γ/α中沉淀析出動力學的影響。結果表明，復合析出相(Ti, V, Mo)C在γ/α中沉淀析出的PTT曲線呈典型的“C”曲線形狀，而NrT曲線表現為典型的反“C”曲線形狀，(Ti, V, Mo)C在γ中的最快析出溫度為1020~1050 ℃；增加γ變形程度，使(Ti, V, Mo)C在γ中沉淀析出的PTT曲線向左上方移動。增加γ中(Ti, V, Mo)C沉淀析出的形變誘導析出量，使(Ti, V, Mo)C在α中沉淀析出的NrT曲線向右下方移動，經計算可知，(Ti, V, Mo)C在α中的最大形核率溫度在630~ 650 ℃，理論計算結果和實驗結果吻合較好。

In recent years, in order to develop the higher strength steel, the idea of increasing thestrength of the hot rolled ferritic steel via complex Ti microalloyed technology has been widely acceptedand applied, such as Ti-Nb, Ti-Mo, Ti-Nb-Mo and Ti-V-Mo. It is important to know the thermodynamicsand kinetics of complex Ti contained precipitates for controlling the precipitation behavior of carbides andimproving the mechanical properties of complex Ti microalloyed steels. In this work, according to theclassical nulceation and growth kinetics theory and the solubility products of various carbides inaustenite/ferrite (γ/α) matrix, the precipitation-time-temperature (PTT) curve, nucleation-time (NrT) curveand the nucleation parameters of (Ti, V, Mo)C carbides in γ/α matrix of Ti-V-Mo complex microalloyedsteel were obtained through the theoretical calculation. Moreover, the effects of deformation stored energyand the amount of strain-induced precipitation in γ matrix on the precipitation kinetics of (Ti, V, Mo)C werediscussed. The results showed that the PTT diagrams of (Ti, V, Mo)C in γ/α matrix showed “C” shape curve,while the NrT curves showed inverse “C” shape curve. The nose temperature of (Ti, V, Mo)C in γ matrix isabout 1020~1050 ℃, increasing the deformation stored energy of γ matrix moves the PPT curve to theupper left. In addition, the NrT curve of (Ti, V, Mo)C precipitated in α matrix moves towards to the lowerright by properly increasing the amount of strain-induced precipitation in γ matrix. The maximumnucleation rate temperature of (Ti, V, Mo)C in ferrite is around 630~650 ℃ from the theoretical calculation,while agree well with the result of experimental observation.

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