CSP热轧30CrMo带钢的热处理工艺
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摘要
研究了不同热处理工艺对CSP热轧30CrMo带钢组织和性能的影响。结果表明:900℃下保温15min和60min后油淬,均获得马氏体组织。经不同温度回火后,淬火条件为900℃保温15min时力学性能更加优良。随着回火温度的升高,马氏体分解加快,板条结构逐渐消失,基体中的渗碳体不断析出;当回火温度由200℃增加到600℃时,其抗拉强度由1 744MPa降至949MPa,硬度由50.8HRC降至35.3HRC;而断后伸长率先减小后增加,屈服强度先增大后减小。当回火温度为300℃时,屈服强度达到最大值,为1 421MPa;断后伸长率达到最小值,为7.5%。此外,通过回归分析建立了在不同温度下回火120min后硬度预测模型,计算结果与试验结果吻合较好。
The effect of heat treatment processes on microstructure and mechanical properties of 30 CrMo hot rolled steel produced by CSP(compact strip production)process were investigated.The results show that the martensite is obtained in the experimental steels by oil quenched from 900℃ after holding for 15 min and 60 min.And the samples which oil quenched from 900℃after holding for 15 min have the better mechanical properties after tempering at different temperatures.With the increase of tempering temperature,the decomposition of martensite accelerated that resulted in the lath character of martensite gradually disappeared and the precipitation of cementite in matrix.When the tempering temperature increased from 200℃ to 600℃,the tensile strength decreased from1 744 MPa to 949 MPa and the hardness of the experimental steel decreased from 50.8 HRC to 35.3 HRC.While the elongation first decreased and then increased,the yield strength first increased and then decreased.When the tempering temperature is 300℃,the experimental steel has the maximum yield strength and the minimum elongation which are 1 421 MPa and 7.5%,respectively.Moreover,the model was developed to predict the hardness of experimental steel after tempered at different temperatures for 120 min.The calculated results were in good agreement with the experimental results.
The effect of heat treatment processes on microstructure and mechanical properties of 30 CrMo hot rolled steel produced by CSP(compact strip production)process were investigated.The results show that the martensite is obtained in the experimental steels by oil quenched from 900℃ after holding for 15 min and 60 min.And the samples which oil quenched from 900℃after holding for 15 min have the better mechanical properties after tempering at different temperatures.With the increase of tempering temperature,the decomposition of martensite accelerated that resulted in the lath character of martensite gradually disappeared and the precipitation of cementite in matrix.When the tempering temperature increased from 200℃ to 600℃,the tensile strength decreased from1 744 MPa to 949 MPa and the hardness of the experimental steel decreased from 50.8 HRC to 35.3 HRC.While the elongation first decreased and then increased,the yield strength first increased and then decreased.When the tempering temperature is 300℃,the experimental steel has the maximum yield strength and the minimum elongation which are 1 421 MPa and 7.5%,respectively.Moreover,the model was developed to predict the hardness of experimental steel after tempered at different temperatures for 120 min.The calculated results were in good agreement with the experimental results.
引文
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[2]黄开金,林鑫,胡木林,等.激光焊接金刚石锯片的研究现状[J].激光技术,2006,30(5):486.(Huang K J,Lin X,Hu M L,et al.Development of laser welding diamond saw blade[J].Laser Technology,2006,30(5):486.)
[3]郑洋,李卫.薄板坯连铸连轧30CrMo带钢的组织与力学性能[J].热加工工艺,2013,42(9):143.(Zhen Y,Li W.Microstructure and mechanical properties of30CrMo strip steel produced by continuous casting and rolling[J].Hot Working Technology,2013,42(9):143.)
[4]霍向东,王元立,柳得橹,等.CSP低碳钢板的组织和性能[J].钢铁研究学报,2004,16(3):55.(Huo X D,Wang Y L,Liu D L,et al.Microstructure and mechanical properties of low carbon steel strip produced by EAF-CSP process[J].Journal of Iron and Steel Research,2004,16(3):55.)
[5]黄刚,温德智,焦国华,等.薄板坯连铸连轧30CrMo钢的热轧组织与力学性能[J].材料热处理学报,2011,32(6):109.(Huang G,Wen D Z,Jiao G H,et al.Microstructure and mechanical properties of a hot-rolled 30CrMo steel produced by compact strip production[J].Transactions of Materials and Heat Treatment,2011,32(6):109.)
[6]廖林镇.基于CSP流程的30CrMo钢热处理工艺研究[D].武汉:武汉科技大学,2016.(Liao L Z.Study on heat treatment process of 30CrMo steel by CSP process[D].Wuhan:Wuhan University of Science and Technology,2016.)
[7]李黎.基于CSP工艺生产热轧宽带30CrMo钢的相变机理研究[D].武汉:武汉科技大学,2015.(Li L.Study on the mechanism of phase transformation of CSP process to produce wide strip of 30CrMo[D].Wuhan:Wuhan University of Science and Technology,2015.)
[8]廖林镇,杨庚蔚,余驰斌,等.淬火工艺对CSP生产的30CrMo钢组织和性能的影响[J].材料热处理学报,2016,37(7):136.(Liao L Z,Yang G W,Yu C B,et al.Effect of quenching process on microstructure and properties of 30CrMo steel produced by CSP process[J].Transactions of Materials and Heat Treatment,2016,37(7):136.)
[9]苏德达.奥氏体晶粒长大与晶界迁移[J].金属制品,2004,30(5):51.(Su D D.Austenitic grain growth and grain boundary remove[J].Metal Productions,2014,30(5):51.)
[10]Kaijalainen A J,Suikkanen P P,Limnell T J,et al.Effect of austenite grain structure on the strength and toughness of direct-quenched martensite[J].Journal of Alloys and Compounds,2013,577:S642.
[11]刘群,欧梅桂,王攀智,等.回火温度对22SiMnCrNi2Mo钢组织与力学性能的影响[J].金属热处理,2014(3):49.(Liu Q,Ou M G,Wang P Z,et al.Influence of tempering temperature on microstructure and mechanical properties of22SiMnCrNi2Mo steel[J].Heat Treatment of Metals,2014(3):49.)
[12]杨庚蔚,孙新军,李昭东,等.回火温度对1500MPa级NbTi低合金直接淬火钢组织与性能的影响[J].材料科学与工艺,2013,21(2):118.(Yang G W,Sun X J,Li Z D,et al.Effects of temperature on microstructure and mechanical properties of 1500 MPa grade Nb-Ti low alloyed directly quenched steel[J].Material Science and Technology,2013,21(2):118.)
[13]崔忠圻,刘北兴.金属学与热处理原理[M].哈尔滨:哈尔滨工业大学出版社,2004.(Cui Z Q,Liu B X.Metal and Heat Treatment[M].Harbin:Harbin Institute of Technology,2004.)
[14]张国英,刘春明,张辉,等.钢铁材料中刃位错与溶质原子的交互作用[J].东北大学学报:自然科学版,2005,26(10):972.(Zhang G Y,Liu C M,Zhang H,et al.Interaction of edge dislocations and solute atoms in steel metals[J].Journal of Northeastern University:Natural Science,2005,26(10):972.)
[15]杨丽颖,王守仁,王红岩,等.截齿形变热处理的组织观察[J].机床与液压,2004(7):108.(Yang L Y,Wang S R,Wang H Y,et al.Observation on microstructure after ausforming of coal cutter[J].Machine Tool and Hydraulics,2004(7):108.)
[16]Prawoto Y,Jasmawati N,Sumeru K.Effect of prior austenite grain size on the morphology and mechanical properties of martensite in medium carbon steel[J].Journal of Materials Science and Technology,2012,28(5):461.
[17]Hollomon J H,Jaffe L D.Time-temperature relations in tempering steel[J].Transaction of AIME,1945,162:223.
[18]郭从盛.淬火钢回火过程的数学模型[J].金属学报,1999(8):865.(Guo C S.A mathematical model of the tempering procedure of hardened steel[J].Acta Metallurgica Sinica,1999(8):865.)