Fe-Cu-M(Mn,Al,Ni,Si)系合金中Cu析出行为的热动力学模拟  

Thermodynamic Simulation of Cu Precipitation Behavior in Fe-Cu-M(Mn,Al,Ni,Si) Alloys

作　　者：吕萌 高雪云[1,2] 王海燕 杨劼[1] 邢磊 张成磊[1] Lv Meng;Gao Xueyun;Wang Haiyan;Yang Ji;Xing Lei;Zhang Chenlei(School of Materials and Metallurgy(Rare Earth College),Inner Mongolia University of Science and Technology,Baotou 014010,China;Inner Mongolia Autonomous Region Key Laboratory of Advanced Metal Materials,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古自治区新金属材料重点实验室,内蒙古包头014010

出　　处：《稀有金属》2025年第1期50-56,共7页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51764047)资助。

摘　　要：合金元素的添加对富Cu亚稳相的析出具有重要作用。本文利用Matcalc软件,基于Onsager热力学极值原理的经典形核理论,结合Kampmann-Wagner模型对析出相进行模拟,探究了Mn,Al,Ni,Si元素对Fe-Cu系合金在500℃时效过程中Cu析出行为的影响,并与硬度变化实验结果进行比较分析。结果表明,Al,Mn,Ni元素加速了体心立方(bcc)-Cu的析出,增强了bcc-Cu的析出强化效果,提高了Fe-Cu系合金的硬度;Mn与Ni元素使得bcc-Cu的临界形核功降低,从而增大了bcc-Cu的形核速率和数量密度;时效后期Mn元素加速了析出颗粒的粗化,导致合金时效后期硬度下降;Ni元素延迟Cu析出相的粗化,起到细晶强化增强合金硬度;Si加入后延缓了Cu的析出并减少了析出相的数量。模拟结果与实验结果相符,这对含铜高强钢的研发提供了基础数据。After the copper-containing high-strength low-alloy steel is treated by solution and aging,the supersaturated solid solution of the copper-containing steel will dissolve and decompose.Relying on the aging precipitation of Cu,the steel can obtain higher strength without causing significant damage to the plastic toughness of the matrix.The addition of alloying elements plays an important role in the precipitation of copper-rich metastable phases.Therefore,this paper focused on the study of the influence of single alloying elements on the precipitation behavior of Cu,and provided basic data for the alloying design of copper-containing steels.MatCalc software was used to simulate and study the change of Cu precipitation behavior of Fe-Cu-M(M=Mn,Al,Ni,Si) alloys during isothermal aging at 500 ℃.The chemical composition of the matrix was 1.6Fe and 2Cu(%,mass fraction).The simulation method was based on classical nucleation theory(CNT) and Svoboda-Fisher-Frazil-Kozesnik(SFFK) growth model,while combining Kampmann-Wagner model and Binder-Stauffer model to simulate body-centered cubic(bcc)-Cu precipitates.The evolution of the simulated precipitate size and composition followed a mean-field model based on Onsager's thermodynamic extremum principle.The effects of Mn,Al,Ni and Si elements on Cu precipitation behavior of Fe-Cu alloys aged at 500 ℃ were discussed based on the evolution trends of the fraction,number density and average radius of the precipitated phases.Four experimental steels containing 2% Mn,Ni,and Al based on Fe-Cu alloys were smelted.The experimental results were compared with the previous simulation results.The results showed that in the isothermal aging process,the hardness of the four test steels first increased and then decreased with the prolongation of aging time.The hardness value of Fe-Cu alloy in solution state was HV 235.After a short-time aging treatment,the hardness of the test steel was significantly increased with the extension of time due to the precipitation strengthening effect of the c

关 键 词：Fe-Cu系合金 析出动力学 体心立方(bcc)-Cu 硬度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]