。822· 北京科技大学学报 2006年第9期 [1】干勇.薄板坯连铸连轧生产技术若干问题.钢铁，2004， 15]Cheng L.M.Haw bolt E B.Meadow eroft T R.Modeling of 39(8):24 AIN precipitation in low carbon steels.Scripta Mater.1999. [12 Narita K.Physical chemistry of the groups IVa(Ti,Zr),Va 41(6):673 and the rare earth clements in steel.Trans Iron Steel Inst 【1(霍向东.CSP生产低碳钢的晶粒细化和析出相研列学位 Jpn1975,15:145 论刘.北京科技大学，2003 13 Park J Y.Park J R.Choo W Y.Effect of Tiaddition on the 【17于浩.CP热轧低碳钢板组织细化与强化机理研学位 potency of MnS for ferrite nucleation in C-Mn-V steels. 论刘.北京科技大学.2002 ISJ1t2000,40(12):1253 【18)刘清友，梁小恺，王雪莲，等。薄板坯连铸连轧流程低碳 [14 Tukdogan E T.Ignatow icz S.Pearson J.The solbility of A1镇静钢组织细化原因探讨∥2005年薄板坯连铸连轧品 sulphur in iron and iron-manganese albys.J Iron Steel Inst. 种与工艺技术研讨会论文集.扬州，2005：72 1955.180.349 Thermodynamic model for carbonitride precipitation in low carbon steels XIANG Song,LIU Guoquan,LI Changrong,WANG Andong,HAN Oingli Material Science and Engineering School,University of Science and Technology Beijing,Beijing 100083.China ABSTRACT Carbonitride precipitates have significant effects on the mechanical properties of steels via grain refinement and precipitation hardening.Based on the tw o-sublattice model (metal atom sublattice and interstitial atom sublattice)of regular solution,a thermodynamic model for the precipitates of titanium car- bonitride,aluminium nitride and manganese sulfide w as established to study the starting-temperature of precipitates and the austenite composition at a given temperature in a bw carbon steel and applied to com- pact strip production(CSP for short)process.The calculation results show that starting-temperature of the precipitation of Ti(CxN1-x),MnS and AlN are1200℃，1440℃and1010℃，their mole fraction are 2315X105,4 18X104and 3.1X104,respectively.By comparison the simulation results of the mod- el are in agreement w ith the calculated ones by the Thermo-Calc softw are and the available experimental da- ta from some publications.The thermodynamic model can be a useful tool in studying the precipitates of low carbon steels and in analyzing the CSP process. KEY WORDS low carbon steels;carbonitride;thermodynamic model;compact strip production (CSP)[ 11] 干勇.薄板坯连铸连轧生产技术若干问题.钢铁, 2004, 39( 8) :24 [ 12] Narit a K .Physical chemistry of the groups IVa( Ti, Zr) , Va and the rare earth elemen ts in st eel.Trans Iron Steel Inst Jpn, 1975, 15:145 [ 13] Park J Y, Park J R, Choo W Y .Effect of Ti addition on the potency of MnS for f errite nucleation in C-Mn-V steels. ISIJ Int, 2000, 40( 12) :1253 [ 14] T urkdogan E T, Ignatow icz S, Pearson J .The solubilit y of sulphur in iron and iron-manganese alloys.J Iron Steel Inst, 1955, 180:349 [ 15] Cheng L M, Haw bolt E B, Meadow croft T R.Modeling of AlN precipitation in low carbon steels.Scripta Mater, 1999, 41( 6) :673 [ 16] 霍向东.CSP 生产低碳钢的晶粒细化和析出相研究[ 学位 论文] .北京科技大学, 2003 [ 17] 于浩.CSP 热轧低碳钢板组织细化与强化机理研究[ 学位 论文] .北京科技大学, 2002 [ 18] 刘清友, 梁小恺, 王雪莲, 等.薄板坯连铸连轧流程低碳 Al 镇静钢组织细化原因探讨∥2005 年薄板坯连铸连轧品 种与工艺技术研讨会论文集.扬州, 2005:72 Thermodynamic model for carbonitride precipitation in low carbon steels X IANG Song, LIU Guoquan , LI Changrong, WANG Andong , HAN Qingli Material S cience and Engineering S chool, University of Science and Technology Beijing, Beijing 100083, China ABSTRACT Carbonitride precipitates have significant effects on the mechanical properties of steels via g rain refinement and precipitation hardening .Based on the tw o-sublattice model ( metal atom sublattice and interstitial atom sublattice) of regular solution, a thermodynamic model for the precipitates of titanium car￾bonitride, aluminium nitride and manganese sulfide w as established to study the starting-temperature of precipitates and the austenite composition at a given temperature in a low carbon steel and applied to com￾pact strip production ( CSP for sho rt) process .The calculation results show that starting-temperature of the precipitation of Ti( C xN1 -x ) , M nS and AlN are 1 200 ℃, 1 440 ℃and 1 010 ℃, their mole fraction are 2.315 ×10 -5 , 4.18 ×10 -4 and 3.1 ×10 -4 , respectively .By comparison the simulation results of the mod￾el are in agreement w ith the calculated o nes by the Thermo-Calc softw are and the available experimental da￾ta from some publications .The thermodynamic model can be a useful tool in studying the precipitates of low carbon steels and in analyzing the CSP process . KEY WORDS low carbon steels ;carbonitride ;thermodynamic model ;compact strip production ( CSP) · 822 · 北 京 科 技 大 学 学 报 2006 年第 9 期