工程科学学报，第39卷，第5期：710-720.2017年5月 Chinese Journal of Engineering,Vol.39,No.5:710-720,May 2017 DOI:10.13374/j.issn2095-9389.2017.05.009;http://journals.ustb.edu.cn FeCrAl不锈钢的平衡凝固相变与析出行为 邓振强，刘建华四，何杨，韩志彪，苏晓峰，丁浩 北京科技大学工程技术研究院，北京100083 ☒通信f作者，E-mail:liujianhua(@metall.usth.edu.cn 摘要借助Thermo-calc软件对FeCrAl不锈钢所属的Fe-(18-21)Cr(3-5)Al-(0-0.03)C-(0-0.2)Si-(0-0.2)Mn 多元体系在凝固过程中的相变及析出行为进行了研究.采用Thermo-calc中TCFE7数据库对该体系的垂直截面图进行计算， 分析了不同组元对凝固和冷却过程中相变的影响，并得到FeCrAl不锈钢的平衡凝固相变路径图.结果表明FeCrAl不锈钢由 16O0℃平衡冷却至300℃的过程中完整的平衡相变路径为：L→AIN+aδFe→AlN+aδFe+C,C3→AlN+a8Fe+C,C3+CsC6→ AlN+a8Fe+Cr2xC。一→AlN+aδFe+CgC6+g一→AlN+aδFe+CraC6+g+a'一AlN+aδFe+Cr2aC。+a'.凝固过程中C,C,与 σ相是否析出分别取决于体系中C,Si含量：A1含量的提高可扩大aδFe+Cr,C,的稳定区，降低α'相的析出温度，抑制σ相的 析出：Cr含量的提高可以减小aδFe+Cr,C,的稳定区，扩大σ相和a'相的稳定区. 关键词FeCrAl不锈钢；Thermo-Calc;相图计算；凝固模式 分类号TF61 Phase transformations and precipitation behavior in FeCrAl stainless steel during equilibrium solidification DENG Zhen-qiang,LIU Jian-hua,HE Yang,HAN Zhi-biao,SU Xiao-feng,DING Hao Institute of EngineeringTechnology,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:liujianhua@metall.ustb.edu.cn ABSTRACT The phase transformations and precipitation behavior were investigated by using Thermo-Calc software in the Fe-(18-21)Cr-(3-5)Al-(0-0.03)C-(0-0.2)Si-(0-0.2)Mn multicomponent system relevant to FeCrAl stainless steel during solidification.The vertical sections of this system were calculated by using the TCFE7 database.Based on these vertical sections,the influence of different elements was analyzed in the phase transformations during solidification and a diagram of the phase-transformation path of FeCrAl stainless steel was obtained during equilibrium solidification.The results indicate that the full-phase transformation path of FeCrAl stainless steel during the cooling process from 1600℃to300℃is as follows:L→AlN+aδFe→AlN+δFfe+Cr,C3→ AlN+aδfe+C,Cg+CraC6一→AlN+aδFe+CruC。→AlN+aδFe+CrgC6+g一AlN+aδfe+CrC6+g+a'→AlN+aδFe+ CraC+'.The precipitation of Cr,C and o,during the solidification process mainly depends on the carbon and silicon contents in the system,respectively.Increasing the aluminum content can enlarge the stable region of aoFe +Cr,C3,lower the precipitation temperature of a',and restrain o precipitation.Increasing the chromium content can reduce the stable region of aFe+Cr,C and enlarge the stable region of o and a'. KEY WORDS FeCrAl stainless steel;Thermo-Calc;phase diagram calculation;solidification mode FeCrAl不锈钢具有优良的抗高温氧化性能和较 理想材料-2】 低的热膨胀系数，是车辆尾气净化器金属蜂窝载体的 为保证优异的抗高温氧化性能，FeCrAl不锈钢中 收稿日期：2016-07-13 基金项目：国家自然科学基金资助项目(51374023,51574022)工程科学学报,第 39 卷,第 5 期:710鄄鄄720,2017 年 5 月 Chinese Journal of Engineering, Vol. 39, No. 5: 710鄄鄄720, May 2017 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2017. 05. 009; http: / / journals. ustb. edu. cn FeCrAl 不锈钢的平衡凝固相变与析出行为 邓振强, 刘建华苣 , 何 杨, 韩志彪, 苏晓峰, 丁 浩 北京科技大学工程技术研究院, 北京 100083 苣 通信作者, E鄄mail: liujianhua@ metall. ustb. edu. cn 摘 要 借助 Thermo鄄鄄 calc 软件对 FeCrAl 不锈钢所属的 Fe鄄鄄 (18 ~ 21)Cr鄄鄄 (3 ~ 5)Al鄄鄄 (0 ~ 0郾 03)C鄄鄄 (0 ~ 0郾 2)Si鄄鄄 (0 ~ 0郾 2)Mn 多元体系在凝固过程中的相变及析出行为进行了研究. 采用 Thermo鄄鄄calc 中 TCFE7 数据库对该体系的垂直截面图进行计算, 分析了不同组元对凝固和冷却过程中相变的影响,并得到 FeCrAl 不锈钢的平衡凝固相变路径图. 结果表明 FeCrAl 不锈钢由 1600益平衡冷却至 300 益的过程中完整的平衡相变路径为:L寅AlN + 琢啄Fe寅AlN + 琢啄Fe + Cr7 C3 寅AlN + 琢啄Fe + Cr7 C3 + Cr23 C6 寅 AlN + 琢啄Fe + Cr23C6寅AlN + 琢啄Fe + Cr23C6 + 滓寅AlN + 琢啄Fe + Cr23C6 + 滓 + 琢忆寅AlN + 琢啄Fe + Cr23 C6 + 琢忆. 凝固过程中 Cr7 C3与 滓 相是否析出分别取决于体系中 C、Si 含量;Al 含量的提高可扩大 琢啄Fe + Cr7C3的稳定区,降低 琢忆相的析出温度,抑制 滓 相的 析出;Cr 含量的提高可以减小 琢啄Fe + Cr7C3的稳定区,扩大 滓 相和 琢忆相的稳定区. 关键词 FeCrAl 不锈钢; Thermo鄄鄄Calc; 相图计算; 凝固模式 分类号 TF61 Phase transformations and precipitation behavior in FeCrAl stainless steel during equilibrium solidification DENG Zhen鄄qiang, LIU Jian鄄hua 苣 , HE Yang, HAN Zhi鄄biao, SU Xiao鄄feng, DING Hao Institute of EngineeringTechnology, University of Science and Technology Beijing, Beijing 100083, China 苣 Corresponding author, E鄄mail: liujianhua@ metall. ustb. edu. cn ABSTRACT The phase transformations and precipitation behavior were investigated by using Thermo鄄鄄 Calc software in the Fe鄄鄄 (18鄄鄄21)Cr鄄鄄(3鄄鄄5)Al鄄鄄 (0鄄鄄0郾 03)C鄄鄄 (0鄄鄄0郾 2) Si鄄鄄 (0鄄鄄0郾 2)Mn multicomponent system relevant to FeCrAl stainless steel during solidification. The vertical sections of this system were calculated by using the TCFE7 database. Based on these vertical sections, the influence of different elements was analyzed in the phase transformations during solidification and a diagram of the phase鄄transformation path of FeCrAl stainless steel was obtained during equilibrium solidification. The results indicate that the full鄄phase transformation path of FeCrAl stainless steel during the cooling process from 1600 益 to 300 益 is as follows: L寅AlN + 琢啄Fe寅AlN + 琢啄Fe + Cr7 C3 寅 AlN + 琢啄Fe + Cr7C3 + Cr23C6寅AlN + 琢啄Fe + Cr23 C6 寅AlN + 琢啄Fe + Cr23 C6 + 滓寅AlN + 琢啄Fe + Cr23 C6 + 滓 + 琢忆寅AlN + 琢啄Fe + Cr23C6 + 琢忆. The precipitation of Cr7C3 and 滓, during the solidification process mainly depends on the carbon and silicon contents in the system, respectively. Increasing the aluminum content can enlarge the stable region of 琢啄Fe + Cr7 C3 , lower the precipitation temperature of 琢忆, and restrain 滓 precipitation. Increasing the chromium content can reduce the stable region of 琢啄Fe + Cr7 C3 and enlarge the stable region of 滓 and 琢忆. KEY WORDS FeCrAl stainless steel; Thermo鄄鄄Calc; phase diagram calculation; solidification mode 收稿日期: 2016鄄鄄07鄄鄄13 基金项目: 国家自然科学基金资助项目(51374023,51574022) FeCrAl 不锈钢具有优良的抗高温氧化性能和较 低的热膨胀系数,是车辆尾气净化器金属蜂窝载体的 理想材料[1鄄鄄2] . 为保证优异的抗高温氧化性能,FeCrAl 不锈钢中