热形变淬火对L485QS酸性管线用钢09MnNb淬硬性的影响
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摘要
对L485QS酸性管线用钢09MnNb进行不同工艺的热形变淬火试验,测试淬硬性并观察相应的组织。结果表明,试验钢在850～1 100℃进行0.2～0.8变形水淬后可获得三种类型的组织,变形温度是影响组织转变类型的主导因素,当温度≤900℃时,主要获得针状铁素体,当温度为950～1 000℃时,主要获得细条状贝氏体,当温度≥1050℃时,主要获得粗大的板条状贝氏体。增大变形量在未再结晶和部分再结晶区分别促进针状铁素体转变和细条状贝氏体转变,在完全再结晶区使板条状贝氏体组织粗细不一致。采用09MnNb钢在950～1 000℃进行e≥0.4的热变形淬火时,可获得以细条状贝氏体为主的淬火组织,以及较高且稳定的淬硬性,并有利于后续回火性能的调控。
To study the effect of ausforming on hardenability in steel 09 MnNb used for L485QS sour service pipeline,different ausforming processes were performed and the subsequent hardenabilitis and microstructures were tested.It revels that three types of microstructures could be gained when ausforming at temperature from 850 ℃ to 1 100 ℃ and under deformation degree ε from 0.2 to 0.8.In the transformation of microstructures,it was a leading role of the deformationn temperature that acicular ferrite, thin-strip bainite and thick-lath bainite were mainly obtained respectively when the temperatures at 900 ℃ and below,from 950℃ to 1 000℃ and at 1 050 ℃ or higher.Increasing deformation degrees could promote transformation of acicular ferrite in unrecrystallization zone and thin-strip bainite in partial recrystallization respectively, but in fully recrystallization zone make the lath bainite either coarsed or refined.When ausforming used of steel 09 MnNb at temperatures from 950 ℃ to 1 000 ℃ and under deformation degree of ε≥0.4 or above,the microstructure consisted fully of thin-strip bainite could be obtained so as a higher and more stable hardenabilities could be achieved, which may be beneficial to the properties control when tempered in following.
To study the effect of ausforming on hardenability in steel 09 MnNb used for L485QS sour service pipeline,different ausforming processes were performed and the subsequent hardenabilitis and microstructures were tested.It revels that three types of microstructures could be gained when ausforming at temperature from 850 ℃ to 1 100 ℃ and under deformation degree ε from 0.2 to 0.8.In the transformation of microstructures,it was a leading role of the deformationn temperature that acicular ferrite, thin-strip bainite and thick-lath bainite were mainly obtained respectively when the temperatures at 900 ℃ and below,from 950℃ to 1 000℃ and at 1 050 ℃ or higher.Increasing deformation degrees could promote transformation of acicular ferrite in unrecrystallization zone and thin-strip bainite in partial recrystallization respectively, but in fully recrystallization zone make the lath bainite either coarsed or refined.When ausforming used of steel 09 MnNb at temperatures from 950 ℃ to 1 000 ℃ and under deformation degree of ε≥0.4 or above,the microstructure consisted fully of thin-strip bainite could be obtained so as a higher and more stable hardenabilities could be achieved, which may be beneficial to the properties control when tempered in following.
引文
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[2] Ling Z Q, Fang J and Yuan Z X, et al. Influence of Quenching on-line on Properties of X70 Steel for Sour Service Seamless Pipe[J]. Energy Procedia,2012,16(Part A):444-450.
[3]凌仲秋,方剑,袁泽喜,等.X70无缝酸性线管的形变淬火和回火工艺[J].金属热处理,2012,37(4):99-101.
[4]黄少文,马光亭,霍孝新,等.淬火及回火热处理对X100管线钢组织和性能的影响[J].材料热处理学报,2015,36(4):133-139.
[5]徐天兵,方剑,彭国良.X70钢级热轧无缝管线钢热处理工艺研究[J].热处理技术与装备,2006,27(1):31-33.
[6]API 5 L-2012, Specification for Line Pipe[S]. American Petroleum Institute Press.
[7]钱海帆.TMCP工艺生产X100管线钢的微观组织及强化机理[J].钢铁研究学报,2011,23(10):54-58.
[8]马永杰,张光亮.TMCP工艺对Mn-Mo-Nb系针状铁素体钢的组织及力学性能的影响[J].钢铁研究学报,2011,23(7):35-38.
[9]袁国,康健,李振垒,等.热轧无缝钢管在线热处理工艺组织性能调控研发技术进展[J].钢管,2018,47(1):30-34.
[10]方剑,邹喜洋,谢凯意,等.40Mn2V非调质钢热变形再结晶的研究[J].特殊钢,2009,30(5):65-67.
[11]唐兴昌,王向飞,张志坚.Nb、Ti微合金化低碳贝氏体高强钢组织性能及再结晶行为的研究[J].热加工工艺,2018,47(8):78-80.
[12]周超洋,吴光亮,刘新彬.含铌低合金高强钢的热变形特征[J].材料热处理学报,2016,37(8):222-227.
[13] Liu Q Y,Deng S H and Sun X J,et al. Effect of Dissolved and Precipitated Niobium in Microalloyed Steel on Deformation Induced Ferrite Transformation(DIPT)[J]. Journal of Iron and Steel Research:English Version,2009,(4):67-71.
[14]Miao C L,Shang C J and Wang X M,et al. Microstructure and Toughness of HAZ in X80 Pipeline Steel with High Nb Content[J].Acta Metallurgica Sinica,2010,46(5):541-546.