变形和回火时间对F40微合金钢组织与性能的影响
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摘要
利用电阻加热结合天锻锻压机对F40微合金钢试样进行不同程度的变形,之后在700℃进行不同的时间回火处理;通过OM、SEM和TEM研究其组织变化,采用电阻仪和显微硬度计测量其电阻率和显微硬度。结果表明:变形量越大,其板条状组织越紊乱,且随着回火时间的延长,板条状组织逐渐呈多边化,回火120 min时局部有小角度亚晶以及位错胞形成;电阻率和硬度随回火时间的变化规律均为先降后升再降,最后趋于稳定;而变形量越大,其电阻率和硬度值越高,达到峰值的时间也越快。
F40 microalloy steel samples were deformed in varying degrees by using resistance heating and forging press,then tempered at 700 ℃for different time. The microstructure was studied through the means of OM,SEM and TEM,and the electric resistance and hardness were measured by resistance meter and micro-hardness instruments. The results show that the larger the deformation is,the more disordered the lath structure becomes. And the lath structure gradually becomes polygonal when the tempering time increases. When the tempering time is120 min,there are some small angle subgrains and dislocation cells form locally. When the tempering time increases,the resistivity and hardness of samples first decrease,then increase and finally decrease to stable values. Moreover,the larger the deformation is,the higher the resistivity and hardness are,and the faster to reach their peak values.
F40 microalloy steel samples were deformed in varying degrees by using resistance heating and forging press,then tempered at 700 ℃for different time. The microstructure was studied through the means of OM,SEM and TEM,and the electric resistance and hardness were measured by resistance meter and micro-hardness instruments. The results show that the larger the deformation is,the more disordered the lath structure becomes. And the lath structure gradually becomes polygonal when the tempering time increases. When the tempering time is120 min,there are some small angle subgrains and dislocation cells form locally. When the tempering time increases,the resistivity and hardness of samples first decrease,then increase and finally decrease to stable values. Moreover,the larger the deformation is,the higher the resistivity and hardness are,and the faster to reach their peak values.
引文
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[5]孙彩娜,陈佩丽,张恒华.高温形变对E36船板钢γ→α相变的影响[J].材料热处理学报,2013,34(9):135-142.Sun Caina,Chen Peili,Zhang Henghua.Effect of high temperature deformation on characteristics ofγ→αphase transition of an E36 ship plate steel[J].Transactions of Materials and Heat Treatment,2013,34(9):135-142.
[6]Chen C Y,Chen C C,Yang J R.Microstructure characterization of nanometer carbides heterogeneous precipitation in Ti-Nb and Ti-Nb-Mo steel[J].Materials Characterization,2014,88(11):69-79.
[7]Yang X L,Xu Y B,Tan X D,et al.Microstructures and mechanical properties of high strength low carbon bainitic steel[C]//Materials Science Forum.2015:257-262.
[8]顾晔.控轧控冷工艺对HY420钢板组织性能的影响[J].金属世界,2017(1):41-45.Gu Ye.Influence of TMCP process to mechanical properties of grade HY420 steel plate[J].Metal World,2017(1):41-45.
[9]彭龙洲,陈利明,杜新立,等.简析控轧控冷技术在无缝钢管生产中的应用[J].钢管,2013,42(4):7-10.Peng Longzhou,Chen Liming,Du Xinli,et al.A brief analysis on application of TMCP to seamless steel tube production[J].Steel Pipe,2013,42(4):7-10.
[10]徐伟力,管曙荣,艾建,等.钢板热冲压新技术关键装备和核心技术[J].世界钢铁,2009,9(2):30-33.Xu Weili,Guan Shurong,Ai Jian,et al.Key equipment and technology of sheet steel hot forming[J].World Iron and Steel,2009,9(2):30-33.
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[12]鲁春艳.汽车轻量化技术的发展现状及其实施途径[J].轻型汽车技术,2007(6):28-31.Lu Chunyan.The current situation and implementation method of the lightweight technology of the vehicle[J].Light Vehicles,2007(6):28-31.
[13]孙彬斌,贾志伟.变形温度对C-Si-Mn系热轧双相钢热变形行为的影响[J].上海金属,2013,35(3):36-40.Sun Binbin,Jia Zhiwei.Effects of deformation temperature on deformation behavior of C-Si-Mn hot rolled dual phase steel[J].Shanghai Metals,2013,35(3):36-40.
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