时效对含Nb低合金高强钢显微组织和力学性能的影响
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摘要
研究了含Nb低合金高强钢在不同时效工艺下的力学性能和显微组织,并采用扫描电镜(SEM)和透射电镜(TEM)及原位分析方法研究了时效过程中试验钢的位错组态和含Nb碳化物的析出规律。结果表明,与原始态相比,随着时效温度的增加,试验钢的强度增加,塑性和韧性降低。显微组织TEM观察和原位分析结果表明,在200～300℃时效温度范围内,随着时效温度的增加,试验钢中的位错密度大幅降低,时效诱发了含Nb碳化物的大量析出,时效后试验钢的强度增加是NbC析出强化的结果。
Mechanical properties and microstructure of low alloy high strength steel containing Nb with different aging processes were studied. The dislocation configuration and the precipitation of Nb-containing carbides in the tested steel during aging were studied by means of scanning electron microscopy(SEM), transmission electron microscopy(TEM) and in-situ analysis. The results show that compared with the original state, the strength of the tested steel increases and the ductility and toughness decrease with the increase of aging temperature. The results of TEM observation and in situ analysis of microstructure show that the dislocation density in the tested steel decreases significantly with the increase of aging temperature in the range of 200-300 ℃, and the aging induces a large amount of precipitation of NbC carbides. The strength of the tested steel increase after aging is due to the NbC precipitation strengthening.
Mechanical properties and microstructure of low alloy high strength steel containing Nb with different aging processes were studied. The dislocation configuration and the precipitation of Nb-containing carbides in the tested steel during aging were studied by means of scanning electron microscopy(SEM), transmission electron microscopy(TEM) and in-situ analysis. The results show that compared with the original state, the strength of the tested steel increases and the ductility and toughness decrease with the increase of aging temperature. The results of TEM observation and in situ analysis of microstructure show that the dislocation density in the tested steel decreases significantly with the increase of aging temperature in the range of 200-300 ℃, and the aging induces a large amount of precipitation of NbC carbides. The strength of the tested steel increase after aging is due to the NbC precipitation strengthening.
引文
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[3] 段修刚,武会宾,蔡庆伍,等.大线能量焊接用FH500高强船板钢的研制与焊接试验[J].材料热处理学报,2012,33(3):62-67.DUAN Xiu-gang,WU Hui-bin,CAI Qing-wu,et al.Preparation and high input welding of a FH500 ship plate steel[J].Transactions of Materials and Heat Treatment,2012,33(3):62-67.
[4] 徐彬,马成勇,李莉,等.热输入对1200 MPa级HSLA钢焊缝组织性能的影响[J].材料研究学报,2017,31(2):129-135.XU Bin,MA Cheng-yong,LI Li,et al.Effect of heat input on microstructure and property of weld joints of a 1200 MPa grade HSLA steel[J].Chinese Journal of Materials Research,2017,31(2):129-135.
[5] Zhang J M,Huo C Y,Ma Q R,et al.NbC-TiN co-precipitation behavior and mechanical properties of x90 pipeline steels by critical-temperature rolling process[J].International Journal of Pressure Vesseles and Piping,2018,165:29-33.
[6] Zhang J M,Sun W H,Sun H.Mechanical properties and microstructure of x120 grade high strength pipeline steel[J].Journal of Iron and Steel Research International,2010,17(10):63-67.
[7] 李鹤林,吉玲康,田伟.西气东输一、二线管道工程的几项重大技术进步[J].天然气工业,2010,30(4):1-9+137.LI He-lin,JI Ling-kang,Tian Wei.Significant technical progress in the west-east gas pipeline projects-line one and line two[J].Natural Gas Industry,2010,30(4):1-9+137.
[8] 赵红波,牛辉,刘海璋.X70、X80螺旋埋弧钢管开发[J].石油科技论坛,2017,36(S1):103-107.ZHAO Hong-bo,NIU Hui,LIU Hai-zhang.Development of X70 and X80 steel grade longitudinally submerged arc welding pipe[J].Oil Forum,2017,36(S1):103-107.
[9] Zhao W,Chen M,Chen S,et al.Static strain aging behavior of an x100 pipeline steel[J].Materials Science and Engineering A,2012,550:418-422.
[10] Huang H H,Yang G W,Zhao G,et al.Effect of Nb on the microstructure and properties of Ti-Mo microalloyed high-strength ferritic steel[J].Materials Science and Engineering A,2018,736:148-155.
[11] Pan H J,Ding H,Cai M H.Microstructural evolution and precipitation behavior of the warm-rolled medium Mn steels containing Nb or Nb-Mo during intercritical annealing[J].Materials Science and Engineering A,2018,736:375-382.
[12] Calcagnotto M,Adachi Y,Ponge D,et al.Deformation and fracture mechanisms in fine and ultrafine-grained ferrite/martensite dual-phase steels and the effect of aging[J].Acta Materialia,2011,59(2):658-670.
[13] Allain S,Bouaziz O,Lebedkina T,et al.Relationship between relaxation mechanisms and strain aging in an austenitic femnc steel[J].Scripta Materialia,2011,64(8):741-744.
[14] Zhou H W,He Y Z,Zhang H,et al.Influence of dynamic strain aging pre-treatment on the low-cycle fatigue behavior of modified 9Cr-1Mo steel[J].International Journal of Fatigue,2013,47:83-89.
[15] 李中平,刘永龙,吴清明,等.冷却工艺对抗大变形管线钢X70HD热涂敷性能的影响[J].世界钢铁,2012,12(1):58-62.LI Zhong-ping,LIU Yong-long,WU Qing-ming,et al.Effect of cooling process on heat coating property of X70HD high deformability resistance pipeline steel[J].World Iron and Steel,2012,12(1):83-89.
[16] Nabarro F R N,Hirth J P.Dislocations in Solids[M].Amsterdam:Elsevier B V,2004.
[17] Rashid M S.Strain-aging of vanadium,niobium or titanium-strengthened high-strength low-alloy steels[J].Metallurgical and Materials Transactions A,1975,6(6):1265-1268.
[18] Erasmus L A,Pussegoda L N.The strain aging characteristics of reinforcing steel with a range of vanadium contents[J].Metallurgical and Materials Transactions A,1980,11(2):231-237.
[19] Gündüz S,Tosun A.Influence of straining and ageing on the room temperature mechanical properties of dual phase steel[J].Materials and Design,2008,29(10):1914-1918.