镀锌时间对桥梁缆索用钢丝组织及扭转性能的影响
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摘要
采用扫描电镜(SEM)、透射电镜(TEM)观察并研究了镀锌时间对桥梁缆索用钢丝组织和扭转性能的影响。结果表明:当镀锌时间从0 s逐步增加至30、150、240 s时,钢丝扭转性能急剧下降,组织退化逐渐严重;随镀锌时间的增加,镀层厚度逐渐增加,Zn-Fe合金层中ζ相(脆性相)的厚度也随之增加,钢丝铁基体表面的微裂纹数量逐渐增加、分布更广、长度增加,钢丝内部索氏体结构被破坏越发严重,渗碳体球化现象逐渐严重,大颗粒状渗碳体周围伴随着微观缺陷的出现。因此,在保证镀锌层厚度足够的前提下,镀锌时间应尽可能短。
The effect of galvanizing time on microstructure and torsional properties of steel wire for bridge cable was observed and studied by means of scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The results show that when the galvanizing time is increased from 0 s to 30 s, 150 s, 240 s, the torsion property of the steel wire decreases sharply and the microstructure degeneration becomes more and more serious. With the increase of galvanizing time, the thickness of coating increases gradually, and the thickness of ζ phase(brittle phase) in Zn-Fe alloy layer increases, and the number, distribution and length of micro-cracks on the surface of iron substrate of the steel wire increases gradually, and the structure of sorbite structure in the steel wire is destroyed more and more seriously, the spheroidization of cementite is becoming more and more serious, accompanied by the appearance of microdefects around the large granular cementites. Therefore, the galvanizing time should be as short as possible on the premise that the thickness of galvanizing zinc coating is enough.
The effect of galvanizing time on microstructure and torsional properties of steel wire for bridge cable was observed and studied by means of scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The results show that when the galvanizing time is increased from 0 s to 30 s, 150 s, 240 s, the torsion property of the steel wire decreases sharply and the microstructure degeneration becomes more and more serious. With the increase of galvanizing time, the thickness of coating increases gradually, and the thickness of ζ phase(brittle phase) in Zn-Fe alloy layer increases, and the number, distribution and length of micro-cracks on the surface of iron substrate of the steel wire increases gradually, and the structure of sorbite structure in the steel wire is destroyed more and more seriously, the spheroidization of cementite is becoming more and more serious, accompanied by the appearance of microdefects around the large granular cementites. Therefore, the galvanizing time should be as short as possible on the premise that the thickness of galvanizing zinc coating is enough.
引文
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[19] Zhou L,Wang L,Chen H,et al.Effects of chromium additions upon microstructure and mechanical properties of cold drawn pearlitic steel wires[J].Journal of Materials Engineering and Performance,2018,27(7):3619-3628.
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[22] Fang F,Zhao Y,Liu P,et al.Deformation of cementite in cold drawn pearlitic steel wire[J].Materials Science and Engineering:A,2014,608:11-15.
[23] 胡显军,谢骏,周立初,等.渗碳体形态对珠光体钢丝拉拔形变的影响[J].钢铁研究学报,2018 (2):120-126.HU Xian-jun,XIE-jun,ZHOU Li-chu,et al.Effect of cementite morphology on pearlitic wire drawing deformation[J].Journal of Iron and Steel Research,2018 (2):120-126.
[24] 涂益友.高速大应变冷拔钢丝的组织和力学性能[D].南京:东南大学,2006.TU Yi-you.The microstructure and mechanical performance of high speed severe cold drawn steel wire[D].Nanjing:Southeast University,2006.
[2] Borchers C,Kirchheim R.Cold-drawn pearlitic steel wires[J].Progress in Materials Science,2016,82:405-444.
[3] 陈祥.桥梁缆索钢丝锌铝合金镀层的制备与耐蚀性能研究[D].哈尔滨:哈尔滨工业大学,2016.CHEN Xiang.Investigation of the preparation and corrosion resistance of zinc-aluminium coated steel wires for bridge application[D].Harbin:Harbin Institute of Technology,2016.
[4] 夏浩成.桥梁缆索用超高强度热镀锌钢丝制备工艺研究[D].哈尔滨:哈尔滨工业大学,2016.XIA Hao-cheng.Study on preparation technique of high strength hot-dip galvanized steel wires for beidge cables[D].Harbin:Harbin Institute of Technology,2016.
[5] 孙文.腐蚀对桥梁缆索用镀锌钢丝力学性能的影响[D].哈尔滨:哈尔滨工业大学,2016.SUN Wen.Influence of corrosion on mechanical properties of galvanized steel wire for bridge cable[D].Harbin:Harbin Institute of Technology,2016.
[6] Yang W J,Yang P,Li X M,et al.Influence of tensile stress on corrosion behaviour of high-strength galvanized steel bridge wires in simulated acid rain[J].Materials and Corrosion,2012,63(5):401-407.
[7] Ma Y,Ye J S,Ge W G,et al.Hydrogen embrittlement and corrosion fatigue performance of galvanized steel wires for high strength bridge cables[C]//Advanced Materials Research.Trans Tech Publications,2011,146:134-142.
[8] Jiang J H,Ma A B,Weng W F,et al.Corrosion fatigue performance of pre-split steel wires for high strength bridge cables[J].Fatigue and Fracture of Engineering Materials and Structures,2009,32(9):769-779.
[9] Zhao T,Zhang G,Zhang S,et al.Fracture characteristics of fully pearlitic steel wire in tension and torsion[J].Journal of Iron and Steel Research,International,2016,23(11):1206-1212.
[10] 王紫鹏,李鹏涛,魏朝晖,等.浸锌时间对?2.78 mm高强度钢丝性能影响[J].金属制品,2013,39(2):25-28.WANG Zi-peng,LI Peng-tao,WEI Chao-hui,et al.Effect of galvanizing time on properties of diameter 2.78 mm high strength steel wire[J].Metal Products,2013,39(2):25-28.
[11] 崔发明.高碳钢丝扭转断裂原因分析[J].金属制品,2007,33(3):39-41.CUI Fa-ming.Torsion break clause analysis of high carbon steel wire[J].Steel Wire Products,2007,33(3):39-41.
[12] 徐忠良.大跨度桥梁缆索用SWRS82B热轧盘条的组织与钢丝扭转性能研究[D].南京:东南大学,2006.XU Zhong-liang.Study on microstructure of SWRS82B for long-span bridges and torsion performance of steel wire[D].Nanjing:Southeast University,2006.
[13] 马忠泉.桥梁缆索用SWRS82B镀锌钢丝扭转性能及其影响因素的研究[D].南京:东南大学,2012.MA Zhong-quan.Investigation of torsion property of SWRS82B galvanizing steel wire for bridge cable and its influencing factors[D].Nanjing:Southeast University,2012.
[14] 郭宁.桥梁缆索用冷拔珠光体钢丝微观组织表征及力学性能研究[D].重庆:重庆大学,2012.GUO Ning.A study on microstructural characterization and mechanical properties of cold drawing pearlitic steel wires for bridge cable[D].Chongqing:Chongqing University,2012.
[15] Hu X,Wang L,Fang F,et al.Origin and mechanism of torsion fracture in cold-drawn pearlitic steel wires[J].Journal of Materials Science,2013,48(16):5528-5535.
[16] 张文超.冷拔钢丝扭转性能的研究[D].合肥:合肥工业大学,2010.ZHANG Wen-chao.Research on the torsion performance of cold-drawn stee1 wire[D].Hefei:Hefei University of Technology,2010.
[17] Gelfi M,Solazzi L,Poli S.Influence of the manufacturing process on defects in the galvanized coating of high carbon steel wires[J].Materials,2017,10(3):264-275.
[18] 丁峰,桑春明,周代义,等.国产桥梁斜拉索用1770 MPa镀锌钢丝制造技术的研究[J].中国工程科学,2009,11(3):57-64.DING Feng,SANG Chun-ming,ZHOU Dai-yi,et al.Research of 1770 MPa galvanized steel wire for stay cable of domestic bridges[J].Engineering Sciences,2009,11(3):57-64.
[19] Zhou L,Wang L,Chen H,et al.Effects of chromium additions upon microstructure and mechanical properties of cold drawn pearlitic steel wires[J].Journal of Materials Engineering and Performance,2018,27(7):3619-3628.
[20] Zhou L,Fang F,Wang L,et al.Torsion delamination and recrystallized cementite of heavy drawing pearlitic wires after low temperature annealing[J].Materials Science and Engineering:A,2018,713:52-60.
[21] Zhou L,Fang F,Wang L,et al.Torsion performance of pearlitic steel wires:Effects of morphology and crystallinity of cementite[J].Materials Science and Engineering:A,2019,743:425-435.
[22] Fang F,Zhao Y,Liu P,et al.Deformation of cementite in cold drawn pearlitic steel wire[J].Materials Science and Engineering:A,2014,608:11-15.
[23] 胡显军,谢骏,周立初,等.渗碳体形态对珠光体钢丝拉拔形变的影响[J].钢铁研究学报,2018 (2):120-126.HU Xian-jun,XIE-jun,ZHOU Li-chu,et al.Effect of cementite morphology on pearlitic wire drawing deformation[J].Journal of Iron and Steel Research,2018 (2):120-126.
[24] 涂益友.高速大应变冷拔钢丝的组织和力学性能[D].南京:东南大学,2006.TU Yi-you.The microstructure and mechanical performance of high speed severe cold drawn steel wire[D].Nanjing:Southeast University,2006.