Ti含量对Si-Mn系中碳弹簧钢组织及性能的影响
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摘要
利用EBSD、SEM和洛氏硬度计等手段研究了Ti含量及回火温度对Si-Mn系中碳弹簧钢的奥氏体晶粒尺寸、显微组织及硬度值的影响,并分析和讨论了试验钢中析出物的类型。结果表明:当试验钢中添加Ti后,合金元素Ti容易与C发生反应生成Ti C,Ti C具有细化奥氏体晶粒的效果,且随Ti含量的增加,晶粒的细化效果越明显,当Ti含量为0.095%时,晶粒尺寸约为13.6μm;Ti具有细化马氏体板条束和板条尺寸的效果,且随着回火温度的提高,马氏体板条束界限越来越模糊,向屈氏体组织转变;随着回火温度的提高,弹簧钢硬度值呈现逐渐降低的趋势,少量的合金元素Ti使钢的硬度值稍微的降低。
Effects of Ti and tempering temperature on austenite grain size,microstructure and hardness values of Si-Mn spring steel were studied by means of EBSD,SEM and Rockwell hardness tester,and the types of precipitates in the tested steels were analyzed and discussed. The results show that when Ti is added to the tested steels,it is easily reacted with C to produce Ti C,which has the effect of refining the austenite grain. With the increasing of Ti content,the grain refinement effect becomes more obvious,and when Ti content is0. 095%,the grain size is about 13. 6 μm. The element Ti has the effect on refining the martensite plate bundle and slab size,and with the increasing of tempering temperature,the boundaries of martensite bundles become more and more blurred,the microstructure changes from martensite to the troostite. Hardness values of the spring steel decrease gradually with the increase of the tempering temperature,and hardness values of the tested steel is slightly reduced by a small amount of alloying element Ti.
Effects of Ti and tempering temperature on austenite grain size,microstructure and hardness values of Si-Mn spring steel were studied by means of EBSD,SEM and Rockwell hardness tester,and the types of precipitates in the tested steels were analyzed and discussed. The results show that when Ti is added to the tested steels,it is easily reacted with C to produce Ti C,which has the effect of refining the austenite grain. With the increasing of Ti content,the grain refinement effect becomes more obvious,and when Ti content is0. 095%,the grain size is about 13. 6 μm. The element Ti has the effect on refining the martensite plate bundle and slab size,and with the increasing of tempering temperature,the boundaries of martensite bundles become more and more blurred,the microstructure changes from martensite to the troostite. Hardness values of the spring steel decrease gradually with the increase of the tempering temperature,and hardness values of the tested steel is slightly reduced by a small amount of alloying element Ti.
引文
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[4]蔡红,刘国强,王绍中,等.淬火温度对60Si2Cr VAT弹簧钢组织与性能的影响[J].金属热处理,2017,42(2):185-189.Cai Hong,Liu Guoqiang,Wang Shaozhong,et al.Effect of quenching temperature on microstructure and properties of 60Si2Cr VAT spring steel[J].Heat Treatment of Metals,2017,42(2):185-189.
[5]朱杰,杨春林,姜云,等.回火温度对60Si2Cr VAT弹簧钢组织及性能的影响[J].金属热处理,2016,41(3):54-57.Zhu Jie,Yang Chunlin,Jiang Yun,et al.Influence of tempering temperature on microstructure and properties of 60Si2Cr VAT spring steel[J].Heat Treatment of Metals,2016,41(3):54-57.
[6]姜云,梁益龙,徐军,等.热处理工艺对冷卷用弹簧钢应变硬化指数的影响[J].金属热处理,2015,40(10):108-112.Jiang Yun,Liang Yilong,Xu Jun,et al.Effect of heat treatment process on strain hardening index of cold coiling spring steel[J].Heat Treatment of Metals,2015,40(10):108-112.
[7]Bathias C,Paris P C.Gigacycle fatigue in mechanical practice[J].Marcel Dekker,2004.
[8]Berger C,Kaiser B.Results of very high cycle fatigue tests on helical compression springs[J].International Journal of Fatigue,2006,28(11):1658-1663.
[9]Yang Z G,Li S X,Li Y D,et al.Relationship among fatigue life,inclusion size and hydrogen concentration for high-strength steel in the VHCF regime[J].Materials Science and Engineering A,2010,527(3):559-564.
[10]Stratmann M,Bohnenkamp K,Ramchandran T.The influence of copper upon the atmospheric corrosion of iron[J].Corrosion Science,1987,27(9):905-926.
[11]姜启川,李章,王守实,等.Ti在铸态奥氏体锰钢中的作用[J].金属学报,1990,26(4):130-134.Jiang Qichuan,Li Zhang,Wang Shoushi,et al.Behaviour of Ti in ascast medium manganese austenitic steel[J].Acta Metallurgica Sinica,1990,26(4):130-134.
[12]宋维锡.金属学[M].2版,北京:冶金工业出版社,1989.
[13]刘宗昌,计云萍,段宝玉,等.板条状马氏体的亚结构及形成机制[J].材料热处理学报,2011,32(3):56-61.Liu Zongchang,Ji Yunping,Duan Baoyu,et al.Substructure and formation mechanism of lath martensite[J].Transactions of Materials and Heat Treatment,2011,32(3):56-61.
[14]刘禹门.钢中回火马氏体的形变亚结构[J].材料热处理学报,2005,26(5):97-99.Liu Yumen.Deformation substructure of tempered martensite in steels[J].Transactions of Materials and Heat Treatment,2005,26(5):97-99.