高强度油井套管钢偏析与含Nb析出相研究
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摘要
点状偏析是连铸坯中的常见半宏观缺陷之一,严重影响后续产品的加工性能和服役性能。点状偏析的形成与枝晶形貌以及凝固末期钢液流动有关,经热轧会遗留至管材中变成带状偏析,两者在成分和位置上存在一致性。热力学计算分析表明,该钢种圆坯点状偏析内存在富Nb碳化物,该析出相是凝固过程中分散型剩余液相溶质偏析的产物。通过SEM观察到,在常规加热过程中该富Nb碳化物并不能完全回溶,在管材带状偏析处仍然可以发现未溶碳化物的存在。
One of the common defects during the continuous casting is the spot-like semi-macrosegregation, which seriously impacts the processing and service performance of subsequent products. The analysis shows that the formation of spot segregation is related to dendrite morphology and the liquid steel flow at the end of solidification. After hot rolling, the retained spot segregation in the casing could form banded segregation, whose composition and location are consistent with those of spot segregation. The thermodynamic calculation results show that Nb-rich carbides exist in the spot segregation of the round billet. The carbide precipitates generate solute segregation in dispersed residual liquid during solidification. As is observed through SEM, during the conventional hot-rolling process, Nb-rich carbides cannot be re-dissolved completely, which could be still found in the banded segregation.
One of the common defects during the continuous casting is the spot-like semi-macrosegregation, which seriously impacts the processing and service performance of subsequent products. The analysis shows that the formation of spot segregation is related to dendrite morphology and the liquid steel flow at the end of solidification. After hot rolling, the retained spot segregation in the casing could form banded segregation, whose composition and location are consistent with those of spot segregation. The thermodynamic calculation results show that Nb-rich carbides exist in the spot segregation of the round billet. The carbide precipitates generate solute segregation in dispersed residual liquid during solidification. As is observed through SEM, during the conventional hot-rolling process, Nb-rich carbides cannot be re-dissolved completely, which could be still found in the banded segregation.
引文
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[3] 刘清友,林军,杜小平.石油套管现状及其可靠性研究方向[J].石油工业技术监督,1999(7):8.(Liu Q Y,Lin J,Du X P.Current situation of oil casing and its reliability research direction [J].Technical Supervision of Petroleum Industry,1999(7):8.)
[4] Al-Mansour M,Alfantazi A M,El-Boujdaini M.Sulfide stress cracking resistance of API-X100 high strength low alloy steel[J].Materials and Design,2009,30(10):4088.
[5] Sponseller D L,Garber R,Straatmann J A.Effect of microstructure on sulfide-stress-cracking resistance of high-strength casing steels[M]//MiCon 82:Optimization of Processing,Properties,and Service Performance Through Microstructural Control.ASTM SRP 792.West Conshohocken:ASTM International,1982:172.
[6] Turconi G L,Gluseppe C,Anelli E,et al.Improvement of resistance to SSC initiation and propagation of high strength OCTG through microstructure and precipitation control[C]//Corrosion 2001.Texas:NACE International,2001:01077.
[7] Masakatsu U,Nakamura S,Abe T,et al.Development of 125ksi grade hsla steel octg for mildly sour environments[C]//Corrosion 2005.Texas:NACE International,2005:05089.
[8] Yuan J,Peng L,Hao G,et al.Behavior of spot segregation in continuously cast blooms and the resulting segregated band in oil pipe steels[J].Steel Research International,2018,89(3):370.
[9] Tsuchida Y,Sugawara I,Miyahara S,et al.Semi-segregation in continuously cast slab[J].Transactions of the Iron and Steel Institute of Japan,1982,22B(9):265.
[10] Haida O,Kitaoka H,Habu Y,et al.Macro-and semi-macroscopic features of the centerline segregation in CC Slabs and their effect on product quality[J].Transactions of the Iron and Steel Institute of Japan,1984,24(11):891.
[11] Scheil E.Bemerkungen zur schichtkristallbildung[J].Zeitschrift für Metallkunde,1942,34(3):70.
[12] Kozeschnik E,Rindler W,Buchmayr B.Scheil–Gulliver simulation with partial redistribution of fast diffusers and simultaneous solid-solid phase transformations[J].International Journal of Materials Research,2007,98(9):826.
[13] Tsuchida Y,Nakada M,Sugawara I,et al.Behavior of semi-macroscopic segregation in continuously cast slabs and technique for reducing the segregation[J].Transactions of the Iron and Steel Institute of Japan,1984,24(11):899.
[14] Pikkarainen T,Vuorenmaa V,Rentola I,et al.Effect of superheat on macrostructure and macrosegregation in continuous cast low-alloy steel slabs[C]//IOP Conference Series:Materials Science and Engineering.IOP Publishing,2016,117(1):012064.
[15] Fisher R M,Speich G R,Cudy L J,et al.Physical chemistry in metallurgy[C]//Proceedings of the Darken Conference.[S.l.]:US Steel Research Laboratory,1976:311.
[16] Roy S,Patra S,Neogy S,et al.Prediction of inhomogeneous distribution of microalloy precipitates in continuous-cast high-strength,low-alloy steel slab[J].Metallurgical and Materials Transactions,2012,43A(6):1845.
[17] Chen Z,Loretto M H,Cochrane R C.Nature of large precipitates in titanium-containing HSLA steels[J].Materials Science and Technology,1987,3(10):836.
[18] Woo D H,Lee S M,Gaye H,et al.The formation behavior of large Nb-Ti carbonitride precipitates during unidirectional solidification of Nb-Ti microalloyed steel[C]//Proceedings of the 7th International Conference on Clean Steel.Balatonfüred,Hungary:[s.n.],2007:115.
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