基于热力学数据对钛微合金钢TiN高温沉淀的统计分析计算

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中图分类号：TG142.33 文献标志码：A 文章编号：1672-0105（2025）02-0064-04

Statistical Analysis and Calculation ofHigh-temperature Precipitation of TiN in Titanium Microalloy Steel Based on Thermodynamic Data

PENG Xiying'， CUI Yan²， XU Xianglai² （1.TangshanPolytechnicUniversity，Tangshan O63299，China;2.TangshanNormalUniversity，Tangshan06309，China）

Abstract：Basedontheanalysis andcalculationof physicalchemistryphase and thermodynamicdata，the high-temperature precipitationbehavioroftitaniummicroaloyedsteelwasstudied.Itwasfoundthatthehigh-temperatureprecipitatesin Titanium-microalloyed steels predominantly consist of TiN and Ti4C2S2 phases.Liquid-phase precipitated TiN particles exhibit limited quantity and coarse dimensions，typically ranging from submicron-scale （ 100-1000nm ）to micron-scale （>1μm） . In contrast，thesolid-phase precipitationofTiismoreabundant，withsizesrangingfrom100to0Onanometers.AdditionallyTiC particles havearelativelylowprecipitationtemperatureandsizesrangingfromafewtotensofnanometers.Furthermore，it was observedthatincreasing thetitanium（Ti）andnitrogen （N）content leadstoa higherproportionofcoarse liquid-phase TiN precipitation. However， when the Ti and N content is low， the formation of liquid-phase TiN can be avoided. The theoretical calculationsindicatethatwhentheNcontentisfixed，tereexistsaciticalvalueofTicontentBelowtiscriticalvalue，itanavoid thedetrmentaleffectofcoarseliquid-phaseTiNformationonductility.Controlling theTicontent withintherangeof0.1to 0.12wt% and the N content below or equal to 0.0035wt% can effectively suppress the liquid-phase precipitation of TiN while ensuring an adequateamountofTiCprecipitationforstrengtheningefects.Moreover，duringthehomogenizationprocesofthebilet，the coarsening rate of TiN is slow，and its influence on the particle size can be neglected.

Keywords： precipitation; TiN; liquid-phase precipitation; solid-phase precipitation

0引言

Ti微合金化钢中存在TiN、 Ti4C2S2 和TiC等大量沉淀物[1-2]，其形成贯穿连铸到卷取各阶段[3-7： ① 连铸和冷却阶段TiN和 Ti4C2S2 的液析及固相析出；

② 精轧阶段TiC的形变诱导析出； ③ 层流冷却阶段TiC的相间析出； ④ 卷取缓冷阶段TiC在铁素体中的过饱和析出。（剩余4477字）