In order to study the cause of the middle crack on the continuous casting slab of A36 ship plate steel,the three-dimensional atom probe (3DAP) specimens extracted from the local characteristic region were fabricated by annular milling with precise position function of the focused ion beam (FIB),which could solve the problem of location randomness of traditional electrolytic polishing method.Furthermore,the problem of easily broken on specimen during the 3DAP test because of material defect or the oversized tip radius of curvature was successfully resolved by modification and angle correction on the holder.Then,the elements distribution in the prepared tip was analyzed by 3DAP.The results showed that the elements of C,Mn,Cr and P were segregated near the crack,and the non-uniform distribution of these elements may cause the cracks in the A36 ship plate steel.
周邦新.三维原子探针-从探测逐个原子来研究材料的分析仪器[J].自然杂志,2005,27(3):125-129.ZHOU Bang-xin.Three dimensional atom probe-an instrument for microstructure investigation of materials with analyzing atoms one by one[J].Chinese Journal of Nature,2005,27(3):125-129.
[2]
Miller M K.Atom probe tomography: Analysis at the atom level[M].New York: Kluwer Academic/Plenum Publishers,2000:11.
[3]
Pereloma E V,Timokhina I B,Russell K F,et al.Characterization of clusters and ultrafine precipitates in Nb-containing C-Mn-Si steels[J].Scripta Materialia,2006,54(3):471-476.
[4]
王泽民,朱晓勇,刘文庆.Mo对Nb-Mo-V微合金化钢中碳化物析出的影响[J].材料研究学报,2010,24(2):217-222.WANG Ze-min,ZHU Xiao-yong,LIU Wen-qing.Influence of Mo on tempering precipitation in Nb-Mo-V microalloyed steels[J].Chinese Journal of Materials Research,2010,24(2):217-222.
[5]
曹双梅,李聪,刘文庆.Nb-V复合对耐火钢力学性能的影响[J].材料热处理学报,2013,34(2):47-51.CAO Shuang-mei,LI Cong,LIU Wen-qing.Effects of niobium and vanadium on mechanical properties of fire resistant steels[J].Transactions of Materials and Heat Treatment,2013,34(2):47-51.
[6]
周邦新,王均安,刘庆东,等.Ni对RPV模拟钢中富Cu原子团簇析出的影响[J].中国材料进展,2011,30(5):1-6.ZHOU Bang-xin,WANG Jun-an,LIU Qing-dong,et al.Effect of nickel alloying element on the precipitation of Cu-rich clusters in RPV model steel[J].Materials China,2011,30(5):1-6.
[7]
刘庆冬,刘文庆,王泽民,等.回火马氏体中合金碳化物的3D原子探针表征[J].金属学报,2009,45(11):1281-1287.LIU Qing-dong,LIU Wen-qing,WANG Ze-min,et al.3D atom probe characterization of alloy carbides in tempering martensite[J].Acta Metallurgica Sinica,2009,45(11):1281-1287.
[8]
刘文庆,朱晓勇,钟柳明,等.微合金钢中第二相临界转变尺寸的研究[J].金属学报,2011,47(8):1094-1098.LIU Wen-qing,ZHU Xiao-yong,ZHONG Liu-ming,et al.Study on critical transition radius of second phase in micro-alloyed steel[J].Acta Metallurgica Sinica,2011,47(8):1094-1098.
[9]
刘文庆,刘庆冬,顾剑锋.原子探针层析技术(APT)最新进展及应用[J].金属学报,2013,49(9):1025-1031.LIU Wen-qing,LIU Qing-dong,GU Jian-feng.Development and application of atom probe tomography[J].Acta Metallurgica Sinica,2013,49(9):1025-1031.
[10]
Saxey D W,Cairney J M,McGrouther D,et al.Atom probe specimen fabrication methods using a dual FIB/SEM[J].Ultramicroscopy,2007,107:756-760.
[11]
Miller M K,Russell K F,Thompson K,et al.Review of atom probe FIB-based specimen preparation methods[J].Microscopy and Microanalysis,2007,13:428-436.
[12]
Thompson K,Lawrence D,Larson D J,et al.In situ site-specific specimen preparation for atom probe tomography[J].Ultramicroscopy,2007,107:131-139.
[13]
Babinsky K,De Kloe R,Clemens H,et al.A novel approach for site-specific atom probe specimen preparation by focused ion beam and transmission electron backscatter diffraction[J].Ultramicroscopy,2014,144:9-18.
[14]
Takahashi J,Tarui T,Kawakami K.Three-dimensional atom probe analysis of heavily drawn steel wires by probing perpendicular to the pearlitic lamellae[J].Ultramicroscopy,2009,109:193-199.
[15]
苏笃星,马建超,夏翁伟,等.加硼钢连铸坯中间裂纹缺陷的改善[J].炼钢,2013,29(3):20-23.SU Du-xing,MA Jian-chao,XIA Weng-wei,et al.Reduce of halfway cracks in boron containing slabs[J].Steelmaking,2013,29(3):20-23.
