铜对管线钢连续冷却转变行为的影响
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摘要
利用热膨胀仪结合显微组织观察、硬度表征和精细微观组织结构分析,对3种Cu含量管线钢的连续冷却转变行为进行了研究。结果表明,在不同冷速下,组织均由复杂的混合型针状铁素体组成;随着Cu含量增加,组织的晶粒尺寸更细小,获得完全针状铁素体的冷速范围更宽。高Cu含量管线钢的硬度-冷速曲线中会出现硬度峰值,分析认为高Cu含量管线钢在连续冷却转变过程中会在一定冷速下会发生Cu的析出。
The continuous cooling transformation( CCT) behavior of three Cu-bearing pipeline steels were studied by using thermal expansion tester combined with mistrostructure observation,hardness test and TEM analysis. The results show that the microstructure is all composed of complex mixed acicular ferrite under different cooling rate; with the increase of Cu content,the grain size of the microstructure becomes finer and the cooling rate range for getting the complete acicular ferrite is wider. The hardness peak will appear in hardness-cooling rate curves of pipeline steel with higher Cu content,which is analyzed as the self-aging precipitation of Cu will occur during continuous cooling transformation at a certain cooling rate.
The continuous cooling transformation( CCT) behavior of three Cu-bearing pipeline steels were studied by using thermal expansion tester combined with mistrostructure observation,hardness test and TEM analysis. The results show that the microstructure is all composed of complex mixed acicular ferrite under different cooling rate; with the increase of Cu content,the grain size of the microstructure becomes finer and the cooling rate range for getting the complete acicular ferrite is wider. The hardness peak will appear in hardness-cooling rate curves of pipeline steel with higher Cu content,which is analyzed as the self-aging precipitation of Cu will occur during continuous cooling transformation at a certain cooling rate.
引文
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[16]Dunne D,Ghasemi Banadkouki S,Yu D.Isothermal transformation products in a Cu-bearing high strength low alloy steel[J].ISIJInternational,1996,36(3):324-333.
[17]Thompson S,Colvin D,Krauss G.Austenite decomposition during continuous cooling of an HSLA-80 plate steel[J].Metallurgical and Materials Transactions A,1996,27:1557-1571.
[2]史显波,杨春光,严伟,等.管线钢的微生物腐蚀[J].中国腐蚀与防护学报,2019,39(1):9-17.Shi Xianbo,Yang Chunguang,Yan Wei,et al.Microbiologically influenced corrosion of pipeline steels[J].Journal of Chinese Society for Corrosion and Protection,2019,39(1):9-17.
[3]单以银,杨柯,史显波,等.一种具有耐微生物腐蚀性能的管线钢:中国,ZL201510418577.9[P].2019-01-08.
[4]史显波,徐大可,闫茂成,等.新型含Cu管线钢的微生物腐蚀行为研究[J].金属学报,2017,53(2):153.Shi Xianbo,Xu Dake,Yan Maocheng,et al.Study on microbiologically influenced corrosion behavior of novel Cu-bearing pipeline steels[J].Acta Metallurgica Sinica,2017,53(2):153.
[5]Shi X B,Yan W,Xu D K,et al.Microbial corrosion resistance of a novel Cu-bearing pipeline steel[J].Journal of Materials Science and Technology,2018,34(12):2480-2491.
[6]Shi X B,Yan W,Yan M C,et al.Effect of Cu addition in pipeline steels on microstructure,mechanical properties and microbiologically influenced corrosion[J].Acta Metallurgica Sinica(English Letters),2017,30(7):601-613.
[7]Shi X B,Yan W,Wang W,et al.Novel Cu-bearing high-strength pipeline steels with excellent resistance to hydrogen-induced cracking[J].Materials and Design,2016,92:300-305.
[8]史显波,严伟,王威,等.新型含Cu管线钢的抗氢致开裂性能[J].金属学报,2018,54(10):1343-1349.Shi Xianbo,Yan Wei,Wang Wei,et al.Hydrogen-induced cracking resistance of novel Cu-bearing pipeline steels[J].Acta Metallurgica Sinica,2018,54(10):1343-1349.
[9]罗国华,范植金,刘文艳.含铜超低碳钢CCT曲线及组织[J].金属热处理,2012,37(9):40-43.Luo Guohua,Fan Zhijin,Liu Wenyan.CCT curves and microstructure of Cu-containing extra-low carbon steel[J].Heat Treatment of Metals,2012,37(9):40-43.
[10]陈连生,胡宝佳,董福涛.含Cu低碳钢CCT曲线及马氏体相变原位观察[J].金属热处理,2017,42(6):13-17.Chen Liansheng,Hu Baojia,Dong Futao,et al.Continuous cooling transformation curve of Cu bearing low carbon steel and in-situ observation of its martensitic transformation[J].Heat Treatment of Metals,2017,42(6):13-17.
[11]严伟,胡平,赵立君,等.新型耐热钢NF12的热处理工艺[J].金属热处理,2009,34(9):59-61.Yan Wei,Hu Ping,Zhao Lijun,et al.Heat treatment of a new type heat-resistant steel NF12[J].Heat Treatment of Metals,2009,34(9):59-61.
[12]Wang W,Shan Y,Yang K.Study of high strength pipeline steels with different microstructures[J].Materials Science and Engineering A,2009,502:38-44.
[13]刘庆东.HSLA铁素体钢中Cu析出强化和奥氏体韧化的原子探针层析技术研究[D].上海:上海大学,2012.Liu Qingdong.Atom probe tomography study on copper precipitation strengthening and reverse austenite toughening in HSLA ferritic steel[D].Shanghai:Shanghai University,2012.
[14]Abe T,Kurihara M,Tagawa H,et al.Effect of thermo-mechanical processing on mechanical properties of copper bearing age hardenable steel plates[J].Transactions ISIJ,1987,27:478-484.
[15]李闯,王学敏,尚成嘉,等.连续冷却过程中含Cu相在钢中析出行为的研究[J].金属学报,2010,46(12):1488-1494.Li Chuang,Wang Xuemin,Shang Chengjia,et al.Study on precipitation behavior of phases containing Cu in the Cu-bearing steel in continuous cooling process[J].Acta Metallurgica Sinica,2010,46(12):1488-1494.
[16]Dunne D,Ghasemi Banadkouki S,Yu D.Isothermal transformation products in a Cu-bearing high strength low alloy steel[J].ISIJInternational,1996,36(3):324-333.
[17]Thompson S,Colvin D,Krauss G.Austenite decomposition during continuous cooling of an HSLA-80 plate steel[J].Metallurgical and Materials Transactions A,1996,27:1557-1571.
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