Effect of Mo on the amount of Ti(C,N) precipitated from austenite in Ti-Mo micro-alloy steel
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摘要: 根據熱力學相關理論,計算了鐵基中Ti和Mo的相互作用系數.結合相關固溶量理論計算方法,對含不同量Mo和Ti的Ti-Mo微合金鋼中Ti(C,N)在800℃到1300℃的奧氏體溫度區固溶析出量進行了理論計算.分析計算結果發現:Mo可降低Ti在鐵基中的活度,抑制Ti的析出,但影響較小,影響程度隨著溫度的升高而減小;Ti含量相同時,影響程度隨Mo含量的增大而增大;Mo含量相同時,影響程度隨Ti含量的增大出現先增大后減小的現象.最后,與相關實驗數據進行對比分析認為:Ti/C原子數比約為0.5時微合金鋼力學性能最好,此時Mo含量對Ti(C.N)析出量的影響最大.Abstract: Activity interaction coefficients between elements Ti and Mo in iron-based systems were estimated on the basis of the thermodynamical theory. The solubility of Ti, C and N in austenite of Ti-Mo micro-alloy steel from 800 to 1300℃ was theoretically calculated at different Ti and Mo contents. Mo can decrease the activity of Ti in iron-based systems and restrain the precipitation of Ti, but its influence is little. The influence degree decreases with the rise of temperature. When the Ti content is constant, the influence degree heightens with the increase of Mo content in the steel. But when the Mo content is constant, the influence strengthens firstly and then weakens with the increase of Ti content in the steel. Finally, the calculated results were compared with experimental data. It is indicated that when the atomic ratio of Ti/C is about 0.5, the mechanical properties of the steel are the best and the Mo content has the greatest impact on the precipitation of Ti(C,N).
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Key words:
- micro-alloy steel /
- austenite /
- carbonitrides /
- precipitation /
- molybdenum /
- titanium
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