郭富玉,闵娜,袁俊丰,左鹏鹏,吴晓春

• 1:上海大学材料科学与工程学院

摘要(Abstract)：

为研究高温退火工艺对DIEVAR电渣锭中合金元素Cr、Mo分布的影响,采用光学显微镜(OM)观察了DIEVAR电渣锭高温退火前后枝晶形态的变化,并利用电子探针(EPMA)对合金元素Cr、Mo的分布进行了定量分析,依据合金元素Cr、Mo的偏析比(SR),确定了DIEVAR电渣锭合适的高温均质化工艺。结果表明:从电渣锭表层到心部,枝晶逐渐粗大、二次枝晶间距逐渐增大。在1270℃下保温10 h后,枝晶组织消失,合金元素Cr、Mo的偏析比(SR)分别从1.73和2.84降低至1.23和1.45,合金元素分布均匀。结合不同高温扩散后合金元素的SR和分布情况确定了DIEVAR电渣锭锻前合适的高温扩散工艺为1270℃保温10 h,这与扩散动力学方程计算的结果相符。

关键词(KeyWords)： DIEVAR(4Cr5Mo2V)钢;高温扩散退火;偏析比(SR);枝晶间距

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2016YFB0300402)

作者(Author): 郭富玉,闵娜,袁俊丰,左鹏鹏,吴晓春

DOI: 10.13289/j.issn.1009-6264.2021-0026

参考文献(References)：

• [1] Gu J B,Li J Y,Chen Y L.Microstructure and strengthening-toughening mechanism of nitrogen-alloyed 4Cr5Mo2V hot-working die steel[J].Metals-Open Access Metallurgy Journal,2017,7(8):310.
• [2] Yan G,Han L,Li C,et al.Effect of macrosegregation on the microstructure and mechanical properties of a pressure-vessel steel[J].Metallurgical and Materials Transactions,2017,48(7):3470-3481.
• [3] Won Y M,Thomas B G.Simple model of microsegregation during solidification of steels[J].Metallurgical and Materials Transactions A,2001,32(7):1-12.
• [4] Maidorn C,Blind D.Solidification and segregation in heavy forging ingots[J].Nuclear Engineering and Design,1985,84(2):285-296.
• [5] Lan J,He J J,Ding W J,et al.Effect of rare earth metals on the microstructure and impact toughness of a cast 0.4C-5Cr-1.2Mo-1.0V Steel[J].ISIJ International,2000,40(12):1275-1282.
• [6] Kheirandish S,Noorian A.Effect of niobium on microstructure of cast AISI h13 hot work tool steel[J].Journal of Iron and Steel Research International,2008,15(4):61-66.
• [7] Dong T S,Liu J H,Fang Q,et al.High strength bimetallic composite material fabricated by electroslag casting and characteristics of its composite interface[J].China Foundry,2016,13(6):389-395.
• [8] Entezari E,Avishan B,Mousalou H,et al.Effect of electroslag remelting on the microstructure and mechanical properties of low carbon bainitic steel[J].Metallic Materials,2018,56(4):253-263.
• [9] Zhang Y,Chen W Q,Chen L,et al.Homogenisation of 20SiMn2MoV steel ingots:thermodynamic/kinetic simulation and experimental validation[J].Materials at High Temperatures,2015,32(4):412-418.
• [10] Liu X,Meng D,Wang Y,et al.Influences of high-temperature diffusion on the homogenization and high-temperature fracture behavior of 30Cr1Mo1V[J].Journal of Materials Engineering and Performance,2015,24(2):1079-1085.
• [11] He S,Li C S,Ren J Y,et al.Investigation on alloying element distribution in Cr8Mo2SiV cold-work die steel ingot during homogenization[J].Steel Research International,2018,89:1800148.
• [12] Ma M,Zhang K,Li Y,et al.Effect of homogenization on microstructure and properties of WE91 alloys[J].Journal of Rare Earths,2013,31(8):830-836.
• [13] Zhang G D,Li X G,Ma M L,et al.Homogenization heat treatment of Mg-7.68Gd-4.88Y-1.32Nd-0.63Al-0.05Zr alloy[J].Journal of Rare Earths,2014,32(5):445-450.
• [14] Kang W,Li H Y,Zhao S X,et al.Effects of homogenization treatments on the microstructure evolution,microhardness and electrical conductivity of dilute Al-Sc-Zr-Er alloys[J].Journal of Alloys and Compounds,2017,704:683-692.
• [15] He Y D,Liu Y,Su Y C.The influence of homogenization on the elemental distribution and properties of Cu-10Ni-1Fe-1Mnalloy ingot[J].Materials Science Forum,2018,4612(921/921):246-255.
• [16] Rafiei M,Mirzadeh H,Malekan M,et al.Homogenization kinetics of a typical nickel-based superalloy[J].Journal of Alloys and Compounds,2019,793:277-282.
• [17] Torkar M,Vodopivec F,Petovar S.Analysis of segregations in as-cast X40CrMoV51 steel[J].Materials Science and Engineering A,1993,173(1/2):313-316.
• [18] MA D S,Zhou J,Chen Z Z,et al.Influence of thermal homogenization treatment on structure and impact toughness of H13 ESR steel[J].Journal of Iron and Steel Research,2009,16(5):56-60.
• [19] Han Y H,Li C S,Ren J Y,et al.Dendrite segregation changes in high temperature homogenization process of as-cast H13 Steel[J].ISIJ International,2019,59(10):1893-1900.
• [20] Totik Y,Gavgali M.The effect of homogenization treatment on the hot workability between the surface and the center of AA 2014 ingots[J].Materials Characterization,2002,49(3):261-268.
• [21] Kadalbal R,Montoya-Cruz J J,Kattamis T M.Solute redistribution during and after solidification of Ni-Al-Ta dendritic monocrystals[J].Metallurgical Transactions A,1980,11(9):1547-1552.
• [22] Lin B Y,Chen E T,Lei T S.The effect of segregation on the austemper transformation and toughness of ductile irons[J].Journal of Materials Engineering and Performance,1998,7(3):407-419.
• [23] Bokstein B,Rodin A.Grain boundary diffusion and grain boundary segregation in metals and alloys[J].Diffusion Foundations,2014,1:99-122.
• [24] Opiela M,Fojt-Dymara G,Grajcar A,et al.Effect of grain size on the microstructure and strain hardening behavior of solution heat-treated low-C high-Mn steel[J].Materials,2020,13(7):1489.
• [25] Qi Y F,Li J,Shi C B.Characterization on microstructure and carbides in an austenitic hot-work die steel during ESR solidification process[J].ISIJ International,2018,58(11):2079-2087.
• [26] Liu X Y,Pan Q L,Fan X,et al.Microstructural evolution of Al-Cu-Mg-Ag alloy during homogenization[J].Journal of Alloys and Compounds,2009,484(1/2):790-794.
• [27] Samaras S N,Haidemenopoulos G N.Modelling of microsegregation and homogenization of 6061 extrudable Al-alloy[J].Journal of Materials Processing Technology,2007,194(1/3):63-73.
• [28] 陈家祥.炼钢常用图表数据手册[M].北京：冶金工业出版社，2010.

文章评论(Comment)：