。438 北京科技大学学报 第31卷 表3850℃试样断口AS分析化学成分 ductility of a C-Mn steel production from serap recyding.IS Table 3 Chemical composition of an 850C test sam ple by AES micro 1nt,2007.47(10):1518 analysis Chen R Y,Yuen W Y D.Copper enrichment behaviours of oop 质量 原子 质量 原子 percontaining steels in simulated thin-slab casting processes.IS 元素 元素 1n,2005,45(6):807 分数则%分数/% 分数/% 分数/% [3 Zhang L Z.Liu X Y.Wang X H.et al.Hat ductility of ligh pu- C 270 1022 Cu 4.20 3.01 rity 16M nR bw alloy steel CC slab./ron Stel.2001.36(12); 0 663 1883 As 7.72 4.68 51 Mn 7.56 625 Sn 1.83 0.70 (张丽珠，刘新宇，王新华，等.高洁净低合金钢16MR连铸 坯高温延塑性研究.钢铁2001,36(12)：51) Fe 69.36 5630 4 Mintz B Yue S Jonas JJ.Hot ductiity of steels and its relation- 温侧加宽延伸和塑性凹槽加深的直接原因. ship to the pmoblem of transverse cracking during continuus cast- ing Int Mater Rev,1991.36:187 3结论 [5 Andrews K W.Empirical formulae for the calcultion of some transformation temperature.J Iron Steel Inst,1965,203(7): (1)在1×103s1的变形速率下，实验低合金 721 钢在1000℃至600℃区间的第脆性温度区为 [6 Mintz B.Impotance of Ar3 temperature in controling ductility 920-730℃. and w idth of hot ductilty trough in steels and its relationship to transverse cracking.Mater Sci Technol.1996 12(2):132 (2)Cu、As和Sn等残余元素在奥氏体晶界的 7 Crowther D N.Mintz B.Influence of carbon on hot ductility of 偏聚提高了第脆性区的上限临界温度，加宽了第 stedls.Mater Sci Technol,1986 2(7):671 脆性温度区间，增加了脆性凹槽的深度. [8 Zarandi F.Yue S.The effect of boron on hot ductility of Nbrmi- (3)920~850℃实验钢种的断面收缩率很低， croalbyed steels.ISI/Int,2006.46(4):591 主要是由于Cu,As和Sn在奥氏体晶界的偏聚，降 [9 Zarandi F.Yue S.Improvement of hot ductiity in the Nbmi- croalbyed steel by high temperature defomation.Int, 低晶品界结合能造成沿晶脆性断裂：825~800℃钢的 2005.45(5):686 断面收缩率很低，主要是由于先共析铁素体形成的 10 Liu Z X.Li DZ.Lu S P,et al.Themal stability of high tem- 薄膜造成的应力集中引起沿晶脆性断裂；775~ perature defomation include ferrite in a low carbon steel IS 725℃钢的断面收缩率增加，主要是由于原奥氏体 1mk,2007.47(2):289 晶粒内部有先共析的铁素体产生，减少晶界处应力 [I1]Hideki M,Koichi0,M oriaki 0.Influence of Cu and Sn on hot 集中，断口呈沿晶塑性断裂形式. ductility of steels with various C content.ISL Int,1997,37 (3):255 [12 Nachtrab W T.Chou Y T.High temperature ductility loss in 参考文献 cadbormanganese and niobium-treat sted.Metall Trar A. [1]Calvo J.Cabrera J M,Rezaeian A.et al.Evaluation of the hot 1986.17(11):1995表 3 850 ℃试样断口 AES 分析化学成分 Table 3 Chemical composition of an 850℃ test sam ple by AES mi cro￾analysis 元素 质量 分数/ % 原子 分数/ % C 2.70 10.22 O 6.63 18.83 Mn 7.56 6.25 Fe 69.36 56.30 元素 质量 分数/ % 原子 分数/ % Cu 4.20 3.01 As 7.72 4.68 Sn 1.83 0.70 温侧加宽延伸和塑性凹槽加深的直接原因. 3 结论 (1)在 1 ×10 -3 s -1的变形速率下, 实验低合金 钢在 1 000 ℃至 600 ℃区间的第 Ⅲ脆性温度区为 920 ～ 730 ℃. (2)Cu 、As 和 Sn 等残余元素在奥氏体晶界的 偏聚提高了第Ⅲ脆性区的上限临界温度, 加宽了第 Ⅲ脆性温度区间 ,增加了脆性凹槽的深度. (3)920 ～ 850 ℃实验钢种的断面收缩率很低 , 主要是由于 Cu 、As 和 Sn 在奥氏体晶界的偏聚 , 降 低晶界结合能造成沿晶脆性断裂 ;825 ～ 800 ℃钢的 断面收缩率很低 ,主要是由于先共析铁素体形成的 薄膜造成的应力集中引起沿晶脆性断裂 ;775 ～ 725 ℃钢的断面收缩率增加, 主要是由于原奥氏体 晶粒内部有先共析的铁素体产生 ,减少晶界处应力 集中 ,断口呈沿晶塑性断裂形式. 参 考 文 献 [ 1] Calvo J , Cab rera J M , Rezaeian A , et al.Evaluation of the hot ductilit y of a C-Mn steel production from scrap recycling .IS IJ In t , 2007 , 47(10):1518 [ 2] Chen R Y , Yuen W Y D.Copper enrichment behaviours of cop￾per-cont aining steels in simulated thin-slab casting processes.IS IJ Int , 2005 , 45(6):807 [ 3] Zhang L Z , Liu X Y , Wang X H , et al.Hot ductility of hi gh pu￾rity 16M nR low alloy steel CC slab.Iron St eel , 2001 , 36(12): 51 (张丽珠, 刘新宇, 王新华, 等.高洁净低合金钢 16MnR 连铸 坯高温延塑性研究.钢铁, 2001 , 36(12):51) [ 4] Mintz B, Yue S , Jonas J J.Hot ductility of steels and its relation￾ship t o the p roblem of transverse cracking during continuous cast￾ing.Int Mater Rev , 1991 , 36:187 [ 5] Andrew s K W.Empiri cal formulae f or the calculation of some transformation t emperature.J Iron S teel Inst , 1965 , 203(7): 721 [ 6] Mintz B .Import ance of Ar3 t emperature in controlling ductilit y and w idth of hot ductility trough in steels, and its relationship t o transverse cracking .Mater S ci Technol, 1996 , 12(2):132 [ 7] Crow ther D N , Mintz B.Influence of carbon on hot ductility of steels.Mater S ci Technol , 1986 , 2(7):671 [ 8] Zarandi F , Yue S.The effect of boron on hot ductility of Nb-mi￾croalloyed steels.IS IJ In t , 2006 , 46(4):591 [ 9] Zarandi F , Yue S .Improvement of hot ductilit y in the Nb-mi￾croalloyed st eel by high temperature def ormation.IS IJ Int , 2005 , 45(5):686 [ 10] Liu Z X , Li D Z , Lu S P , et al.Thermal stability of high tem￾perature def ormation include ferrite in a low carbon st eel.IS IJ In t , 2007 , 47(2):289 [ 11] Hideki M , Koichi O , M oriaki O.Influence of Cu and Sn on hot ductilit y of st eels with various C content.IS IJ Int , 1997 , 37 (3):255 [ 12] Nachtrab W T , C hou Y T .High t emperature ductilit y loss in carbon-manganese and niobium-treat st eel.Metall Tra ns A , 1986 , 17(11):1995 · 438 · 北 京 科 技 大 学 学 报 第 31 卷