Mn-Si-V系贝氏体辙叉钢的连续冷却转变特性
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摘要
在Gleeble-1500热模拟机上采用热膨胀法,测定了一种Mn-Si-V系贝氏体辙叉钢的连续冷却转变曲线。利用DMI 5000M型光学显微镜、Hitachi H-800透射电镜和显微维氏硬度计对不同冷速下试验钢的显微组织和硬度进行分析,并就合金元素对贝氏体相变和显微组织的作用进行讨论。结果表明,试验贝氏体钢的相变点为:Ac_1=730℃、Ac_3=873℃、Ms=320℃。以0.05℃/s的冷速冷却时,试验贝氏体钢获得以上贝氏体为主的组织;在0.05~1.0℃/s的冷速范围内,试验贝氏体钢可以获得以无碳化物贝氏体为主的组织;当冷速大于1.0℃/s,试验贝氏体钢得到无碳化物贝氏体/马氏体复相组织,并且随冷速增加马氏体含量增大;当冷速达到8.0℃/s,试验贝氏体钢获得以低碳马氏体为主的组织。
The continuous cooling transformation curve of a Mn-Si-V bainitic steel for frog was measured by dilatometry on a Gleeble-1500 simulator. The microstructure and hardness of the tested steel with different cooling rates were analyzed by DMI 5000 M optical microscope,Hitachi H-800 transmission electronic microscope( TEM) and micro-vickers hardness tester,and the impact of alloying elements on bainitic transformation and microstructure was discussed. The results indicate that the transformation temperature of the tested bainitic steel are Ac_1=730 ℃,Ac_3= 873 ℃,Ms = 320 ℃. The tested bainitic steel is composed mainly of upper bainite under the cooling rate of 0. 05 ℃/s,and carbide-free bainite under the cooling rate 0. 05-1. 0 ℃/s. If the cooling rate is greater than 1. 0 ℃/s,the microstructure of the tested bainitic steel is carbide-free bainite/martensite. When the cooling rate is greater than 8. 0 ℃/s,the microstructure of the tested bainitic steel is mainly martensite.
The continuous cooling transformation curve of a Mn-Si-V bainitic steel for frog was measured by dilatometry on a Gleeble-1500 simulator. The microstructure and hardness of the tested steel with different cooling rates were analyzed by DMI 5000 M optical microscope,Hitachi H-800 transmission electronic microscope( TEM) and micro-vickers hardness tester,and the impact of alloying elements on bainitic transformation and microstructure was discussed. The results indicate that the transformation temperature of the tested bainitic steel are Ac_1=730 ℃,Ac_3= 873 ℃,Ms = 320 ℃. The tested bainitic steel is composed mainly of upper bainite under the cooling rate of 0. 05 ℃/s,and carbide-free bainite under the cooling rate 0. 05-1. 0 ℃/s. If the cooling rate is greater than 1. 0 ℃/s,the microstructure of the tested bainitic steel is carbide-free bainite/martensite. When the cooling rate is greater than 8. 0 ℃/s,the microstructure of the tested bainitic steel is mainly martensite.
引文
[1]张福成,杨志南,康杰.铁路辙叉用贝氏体钢研究进展[J].燕山大学学报,2013,37(1):1-7.Zhang Fucheng,Yang Zhinan,Kang Jie.Research progress of bainitic steel used for railway crossing[J].Journal of Yanshan University,2013,37(1):1-7.
[2]周清跃,张银花,陈朝阳,等.国内外钢轨钢研究及进展[J].中国铁道科学,2002,23(6):120-126.Zhou Qingyue,Zhang Yinhua,Chen Zhaoyang,et al.The research and development of rail steels in China and foreign countries[J].China Railway Science,2002,23(6):120-126.
[3]崔景阁.贝氏体钢轨在道岔中的应用与加工研究[J].铁道建筑技术,2014(12):62-65.Cui Jingge.Research on application and processing of bainite rail in turnout[J].Railway Construction Technology,2014(12):62-65.
[4]林慧国,傅代直.钢的奥氏体转变曲线——原理、测试与应用[M].北京:机械工业出版社,1988.
[5]代利,杨晓,雷旻.23Cr Ni3Mo钢的连续冷却转变曲线[J].金属热处理,2017,42(3):15-17.Dai Li,Yang Xiao,Lei Min.Continuous cooling transformation curves of23Cr Ni3Mo steel[J].Heat Treatment of Metals,2017,42(3):15-17.
[6]衣海龙,徐薇,龙雷周,等.钛微合金化热轧TRIP钢的连续冷却相变研究[J].材料工程,2015,43(3):7-11.Yi Hailong,Xu Wei,Long Leizhou,et al.Transformation of Timicroalloyed TRIP steel during continuous cooling[J].Journal of Materials Engineering,2015,43(3):7-11.
[7]朱茂华,王福明,文学荣,等.Nb-V微合金中碳非调质钢CCT曲线的测定与分析[J].金属热处理,2017,42(8):20-24.Zhu Maohua,Wang Fuming,Wen Xuerong,et al.Determination and analysis of CCT curve of Nb-V microalloyed medium carbon nonquenched-tempered steel[J].Heat Treatment of Metals,2017,42(8):20-24.
[8]熊万全,栾道成,赵太源,等.新型贝氏体钢连续冷却曲线及组织[J].金属热处理,2013,38(3):10-12.Xiong Wanquan,Luan Daocheng,Zhao Taiyuan,et al.CCT curves and microstructure of a new type bainitic steel[J].Heat Treatment of Metals,2013,38(3):10-12.
[9]陈朝阳,周清跃,张银花,等.试验用贝氏体钢轨钢连续冷却曲线的测定及组织特征[J].铁道学报,2005,27(3):35-39.Chen Zhaoyang,Zhou Qingyue,Zhang Yinhua,et al.Determination of CCT curves and characteristics of microstructure of testing bainitic rail steels[J].Journal of the China Railway Society,2005,27(3):35-39.
[10]杨福宝,白秉哲,刘东雨,等.无碳化物贝氏体/马氏体复相高强度钢的组织与性能[J].金属学报,2004,40(3):296-300.Yang Fubao,Bai Bingzhe,Liu Dongyu,et al.Microstructure and properties of a carbide-free bainite/martensite ultra-high strength steel[J].Acta Metallurgica Sinica,2004,40(3):296-300.
[11]谷海容,赵征志,庞启航,等.780 MPa级热轧铁素体/贝氏体双相钢的组织与扩孔性能[J].金属热处理,2016,41(4):7-10.Gu Hairong,Zhao Zhengzhi,Pang Qihang,et al.Microstructure and hole expansion property of 780 MPa grade hot rolled ferrite/bainite dual-phase steel[J].Heat Treatment of Metals,2016,41(4):7-10.
[12]Bhadeshia H,Lord M,Svensson L-E.Silicon-rich bainitic steel welds[C]//Proceedings of International Conference:Joining and Welding Solutions to Industrial Problems,Japan,2003:43-52.
[13]Kapito A,Stumpf W,Papo M J.The role of alloying elements in bainitic rail steels[J].Journal of the Southern African Institute of Mining and Metallurgy,2013,113(2):67-72.
[14]黄维刚,方鸿生,郑燕康.硅对Mn-B系空冷贝氏体钢组织与性能的影响[J].材料热处理学报,1997,18(1):8-13.Huang Weigang,Fang Hongsheng,Zheng Yankang.Effect of silicon content on the microstructure and properties in Mn-B air-cooled bainitic steel[J].Transactions of Materials Heat Treatment,1997,18(1):8-13.
[15]康沫狂,朱明,陈大明,等.硅合金钢淬火组织中残留奥氏体的力学稳定性与力学性能[J].金属热处理,2005,30(1):14-19.Kang Mokuang,Zhu Ming,Chen Daming,et al.Mechanical property and mechanical stability of retained austenite in quenching microstructure of an alloy steel containing Si[J].Heat Treatment of Metals,2005,30(1):14-19.
[16]陈雨来,董长征,蔡庆伍,等.Mo和Ni对高强无碳化物贝氏体钢组织转变与力学性能的影响[J].材料工程,2013(9):16-21.Chen Yulai,Dong Changzheng,Cai Qingwu,et al.Effect of Mo and Ni on microstructure and mechanical properties of carbide-free bainite ultra-high strength steels[J].Journal of Materials Engineering,2013(9):16-21.
[17]李钰,米尔本大卫.钒微合金化锻造钢[J].钢铁钒钛,2013,34(4):110-117.Li Yu,Milbourn David.Vanadium microalloyed forging steel[J].Iron Steel Vanadium Titanium,2013,34(4):110-117.
[2]周清跃,张银花,陈朝阳,等.国内外钢轨钢研究及进展[J].中国铁道科学,2002,23(6):120-126.Zhou Qingyue,Zhang Yinhua,Chen Zhaoyang,et al.The research and development of rail steels in China and foreign countries[J].China Railway Science,2002,23(6):120-126.
[3]崔景阁.贝氏体钢轨在道岔中的应用与加工研究[J].铁道建筑技术,2014(12):62-65.Cui Jingge.Research on application and processing of bainite rail in turnout[J].Railway Construction Technology,2014(12):62-65.
[4]林慧国,傅代直.钢的奥氏体转变曲线——原理、测试与应用[M].北京:机械工业出版社,1988.
[5]代利,杨晓,雷旻.23Cr Ni3Mo钢的连续冷却转变曲线[J].金属热处理,2017,42(3):15-17.Dai Li,Yang Xiao,Lei Min.Continuous cooling transformation curves of23Cr Ni3Mo steel[J].Heat Treatment of Metals,2017,42(3):15-17.
[6]衣海龙,徐薇,龙雷周,等.钛微合金化热轧TRIP钢的连续冷却相变研究[J].材料工程,2015,43(3):7-11.Yi Hailong,Xu Wei,Long Leizhou,et al.Transformation of Timicroalloyed TRIP steel during continuous cooling[J].Journal of Materials Engineering,2015,43(3):7-11.
[7]朱茂华,王福明,文学荣,等.Nb-V微合金中碳非调质钢CCT曲线的测定与分析[J].金属热处理,2017,42(8):20-24.Zhu Maohua,Wang Fuming,Wen Xuerong,et al.Determination and analysis of CCT curve of Nb-V microalloyed medium carbon nonquenched-tempered steel[J].Heat Treatment of Metals,2017,42(8):20-24.
[8]熊万全,栾道成,赵太源,等.新型贝氏体钢连续冷却曲线及组织[J].金属热处理,2013,38(3):10-12.Xiong Wanquan,Luan Daocheng,Zhao Taiyuan,et al.CCT curves and microstructure of a new type bainitic steel[J].Heat Treatment of Metals,2013,38(3):10-12.
[9]陈朝阳,周清跃,张银花,等.试验用贝氏体钢轨钢连续冷却曲线的测定及组织特征[J].铁道学报,2005,27(3):35-39.Chen Zhaoyang,Zhou Qingyue,Zhang Yinhua,et al.Determination of CCT curves and characteristics of microstructure of testing bainitic rail steels[J].Journal of the China Railway Society,2005,27(3):35-39.
[10]杨福宝,白秉哲,刘东雨,等.无碳化物贝氏体/马氏体复相高强度钢的组织与性能[J].金属学报,2004,40(3):296-300.Yang Fubao,Bai Bingzhe,Liu Dongyu,et al.Microstructure and properties of a carbide-free bainite/martensite ultra-high strength steel[J].Acta Metallurgica Sinica,2004,40(3):296-300.
[11]谷海容,赵征志,庞启航,等.780 MPa级热轧铁素体/贝氏体双相钢的组织与扩孔性能[J].金属热处理,2016,41(4):7-10.Gu Hairong,Zhao Zhengzhi,Pang Qihang,et al.Microstructure and hole expansion property of 780 MPa grade hot rolled ferrite/bainite dual-phase steel[J].Heat Treatment of Metals,2016,41(4):7-10.
[12]Bhadeshia H,Lord M,Svensson L-E.Silicon-rich bainitic steel welds[C]//Proceedings of International Conference:Joining and Welding Solutions to Industrial Problems,Japan,2003:43-52.
[13]Kapito A,Stumpf W,Papo M J.The role of alloying elements in bainitic rail steels[J].Journal of the Southern African Institute of Mining and Metallurgy,2013,113(2):67-72.
[14]黄维刚,方鸿生,郑燕康.硅对Mn-B系空冷贝氏体钢组织与性能的影响[J].材料热处理学报,1997,18(1):8-13.Huang Weigang,Fang Hongsheng,Zheng Yankang.Effect of silicon content on the microstructure and properties in Mn-B air-cooled bainitic steel[J].Transactions of Materials Heat Treatment,1997,18(1):8-13.
[15]康沫狂,朱明,陈大明,等.硅合金钢淬火组织中残留奥氏体的力学稳定性与力学性能[J].金属热处理,2005,30(1):14-19.Kang Mokuang,Zhu Ming,Chen Daming,et al.Mechanical property and mechanical stability of retained austenite in quenching microstructure of an alloy steel containing Si[J].Heat Treatment of Metals,2005,30(1):14-19.
[16]陈雨来,董长征,蔡庆伍,等.Mo和Ni对高强无碳化物贝氏体钢组织转变与力学性能的影响[J].材料工程,2013(9):16-21.Chen Yulai,Dong Changzheng,Cai Qingwu,et al.Effect of Mo and Ni on microstructure and mechanical properties of carbide-free bainite ultra-high strength steels[J].Journal of Materials Engineering,2013(9):16-21.
[17]李钰,米尔本大卫.钒微合金化锻造钢[J].钢铁钒钛,2013,34(4):110-117.Li Yu,Milbourn David.Vanadium microalloyed forging steel[J].Iron Steel Vanadium Titanium,2013,34(4):110-117.