Nb对高强度镀锌钢丝组织性能的影响
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摘要
设计了两种不同Nb含量的高强度镀锌钢丝(0.025Nb和Free-Nb),采用光学显微镜、扫描电镜和拉伸试验机等研究了两种试验钢的显微组织和力学性能,并对其珠光体团尺寸和珠光体片层间距进行了对比分析。结果表明:添加Nb元素能细化试验钢奥氏体的晶粒度,在等温转变后得到细小的珠光体团;此外Nb元素的加入增大了试验钢等温转变的实际过冷度,减小了试验钢的珠光体片层间距,提高了试验钢的抗拉强度和伸长率。
Two kinds of high strength galvanized steels wire(0.025 Nb and Free-Nb) with different Nb content were designed, microstructure and mechanical properties of the tested steels were studied by means of optical microscope, scanning electron microscopy and tensile tester, and the size of pearlite clusters and the spacing of pearlite lamellar were compared and analyzed. The results show that the grain size of austenite in the test steels can be refined by adding Nb element, and fine pearlite clusters can be obtained after isothermal transformation. In addition, the addition of Nb element increases the actual undercooling degree of the tested steel during isothermal transformation, reduces the pearlite lamellar spacing of the tested steel, and improves the tensile strength and elongation of the tested steel.
Two kinds of high strength galvanized steels wire(0.025 Nb and Free-Nb) with different Nb content were designed, microstructure and mechanical properties of the tested steels were studied by means of optical microscope, scanning electron microscopy and tensile tester, and the size of pearlite clusters and the spacing of pearlite lamellar were compared and analyzed. The results show that the grain size of austenite in the test steels can be refined by adding Nb element, and fine pearlite clusters can be obtained after isothermal transformation. In addition, the addition of Nb element increases the actual undercooling degree of the tested steel during isothermal transformation, reduces the pearlite lamellar spacing of the tested steel, and improves the tensile strength and elongation of the tested steel.
引文
[1] 闫志刚,薛花娟.沪通长江大桥直径7 mm2000 MPa级钢丝试验研究[J].铁道学报,2018,40(7):115-120.YAN Zhi-gang,XUE Hua-juan.Test research on 2000 MPa 7 mm diamerer steel wire for hutong changjiang river bridge[J].Journal of the China Railway Society,2018,40(7):115-120.
[2] Ohba H,Nishida S,Tarui T,et al.High-performance wire rods produced with DLP[J].Nippon Steel Technical Report,2007,96:50-56.
[3] Kazeminezhad M,Thaeri A K.The effect of controlled cooling after hot rolling on the mechanical properties of a commercial high carbon steel wire rod[J].Materials and Design,2003,24(6):415-421.
[4] 周雯,吴开明,王厚昕,等.Nb-Ti微合金化桥梁钢Q370qE-HPS动态再结晶行为[J].材料热处理学报,2017,38(10):145-149.ZHOU Wen,WU Kai-ming,WANG Hou-xin,et al.Dynamic recrystallization behavior of Nb-Ti microalloyed steel Q370qE-HPS[J].Transactions of Materials and Heat Treatment,2017,38(10):145-149.
[5] Williams J M,Simpson I D,Macdonald J K.Niobium in rail steels[J].Niobium-proceedings of the International Symposium-AIME,1987,10:25-28.
[6] Fong H S.Determining true pearlite lamellar spacing from observed apparent spacing[J].Metallography,1989,23(3):173-188.
[7] Li Z D,Miyamoto G,Yang Z G,et al.Nucleation of austenite from pearlitic structure in an Fe-0.6C-1Cr alloy[J].Scripta Materialia,2009,60(7):485-488.
[8] Pickering F B,Garbarz B.The effect of transformation temperature and prior austenite grain size on the pearlite colony size[J].Scripta Metallurgica,1987,21(3):249-253.
[9] Cos P A.Determination of the pearlite nodule size in eutectoid steels[J].Metallography,1989,23(2):135-146.
[10] 栾佰峰,张达,郭宁,等.桥梁缆索用过共析钢热轧盘条微观组织定量表征[J].材料热处理学报,2011,32(7):78-82.LUAN Bai-feng,ZHANG Da,GUO Ning,et al.Quantitative characterization on microstructure of hot rolled hypereutectoid steel wire rod for bridge cable[J].Transactions of Materials and Heat Treatment,2011,32(7):78-82.
[11] 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.
[12] Buono V T L,Gonzalez B M,Lima T M,et al.Measurement of fine pearlite interlamellar spacing by atomic force microscopy[J].Journal of Materials Science,1997,32(4):1005-1008.
[13] 杨超飞,吴庆辉,陈颖,等.铌对高碳钢连续冷却过程中相变和珠光体片层间距的影响[J].机械工程材料,2013,37(3):15-19.YANG Chao-fei,WU Qing-hui,CHEN Ying,et al.Effects of niobium on phase transformation and lamellar spacing of pearlites of high carbon steel during continuous cooling[J].Materials for Mechanical Engineering,2013,37(3):15-19.
[14] Marder A R,Bramfitt B L.Effect of continuous cooling on the morphology and kinetics of pearlite[J].Metallurgical Transactions A,2009,6(11):1975-1977.
[15] 孙曼丽,江波,陈刚,等.Nb微合金化对高碳钢组织和性能的影响[J].金属热处理,2016,41(4):71-73.SUN Man-li,JIANG Bo,CHEN Gang,et al.Effect of Nb microalloying on microstructure and mechanical properties of high carbon steel[J].Heat Treatment of Metals,2016,41(4):71-73.
[16] Marder A R,Bramfitt B L.The effect of morphology on the strength of pearlite[J].Metallurgical Transactions A,1976,7(3):365-368.
[17] Hyzak J M,Bernstein I M.The role of microstructure on the strength and toughness of fully pearlitic steels[J].Metallurgical Transactions A,1976,7(8):1215-1218.
[18] Seiki N,Yoshie A,Imagumbai M.Work hardening of hypereutectoid and eutectoid steels during drawing[J].ISIJ International,1998,38(2):177-186.
[2] Ohba H,Nishida S,Tarui T,et al.High-performance wire rods produced with DLP[J].Nippon Steel Technical Report,2007,96:50-56.
[3] Kazeminezhad M,Thaeri A K.The effect of controlled cooling after hot rolling on the mechanical properties of a commercial high carbon steel wire rod[J].Materials and Design,2003,24(6):415-421.
[4] 周雯,吴开明,王厚昕,等.Nb-Ti微合金化桥梁钢Q370qE-HPS动态再结晶行为[J].材料热处理学报,2017,38(10):145-149.ZHOU Wen,WU Kai-ming,WANG Hou-xin,et al.Dynamic recrystallization behavior of Nb-Ti microalloyed steel Q370qE-HPS[J].Transactions of Materials and Heat Treatment,2017,38(10):145-149.
[5] Williams J M,Simpson I D,Macdonald J K.Niobium in rail steels[J].Niobium-proceedings of the International Symposium-AIME,1987,10:25-28.
[6] Fong H S.Determining true pearlite lamellar spacing from observed apparent spacing[J].Metallography,1989,23(3):173-188.
[7] Li Z D,Miyamoto G,Yang Z G,et al.Nucleation of austenite from pearlitic structure in an Fe-0.6C-1Cr alloy[J].Scripta Materialia,2009,60(7):485-488.
[8] Pickering F B,Garbarz B.The effect of transformation temperature and prior austenite grain size on the pearlite colony size[J].Scripta Metallurgica,1987,21(3):249-253.
[9] Cos P A.Determination of the pearlite nodule size in eutectoid steels[J].Metallography,1989,23(2):135-146.
[10] 栾佰峰,张达,郭宁,等.桥梁缆索用过共析钢热轧盘条微观组织定量表征[J].材料热处理学报,2011,32(7):78-82.LUAN Bai-feng,ZHANG Da,GUO Ning,et al.Quantitative characterization on microstructure of hot rolled hypereutectoid steel wire rod for bridge cable[J].Transactions of Materials and Heat Treatment,2011,32(7):78-82.
[11] 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.
[12] Buono V T L,Gonzalez B M,Lima T M,et al.Measurement of fine pearlite interlamellar spacing by atomic force microscopy[J].Journal of Materials Science,1997,32(4):1005-1008.
[13] 杨超飞,吴庆辉,陈颖,等.铌对高碳钢连续冷却过程中相变和珠光体片层间距的影响[J].机械工程材料,2013,37(3):15-19.YANG Chao-fei,WU Qing-hui,CHEN Ying,et al.Effects of niobium on phase transformation and lamellar spacing of pearlites of high carbon steel during continuous cooling[J].Materials for Mechanical Engineering,2013,37(3):15-19.
[14] Marder A R,Bramfitt B L.Effect of continuous cooling on the morphology and kinetics of pearlite[J].Metallurgical Transactions A,2009,6(11):1975-1977.
[15] 孙曼丽,江波,陈刚,等.Nb微合金化对高碳钢组织和性能的影响[J].金属热处理,2016,41(4):71-73.SUN Man-li,JIANG Bo,CHEN Gang,et al.Effect of Nb microalloying on microstructure and mechanical properties of high carbon steel[J].Heat Treatment of Metals,2016,41(4):71-73.
[16] Marder A R,Bramfitt B L.The effect of morphology on the strength of pearlite[J].Metallurgical Transactions A,1976,7(3):365-368.
[17] Hyzak J M,Bernstein I M.The role of microstructure on the strength and toughness of fully pearlitic steels[J].Metallurgical Transactions A,1976,7(8):1215-1218.
[18] Seiki N,Yoshie A,Imagumbai M.Work hardening of hypereutectoid and eutectoid steels during drawing[J].ISIJ International,1998,38(2):177-186.