钛微合金钢形变诱导析出规律的热模拟
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摘要
采用Gleeble 3800热力模拟实验机模拟了钛微合金化低碳钢的两阶段控轧技术,通过应力松弛法得到了其应力松弛曲线及析出—时间—温度(PTT)曲线,研究了钛微合金钢在变形过程中的析出规律。结果表明:两阶段轧制后钛微合金钢的组织显著细化,比较不同变形量下的应力松弛曲线,可以发现随着变形量的增大,应力松弛的速度加快,形变诱导析出的PTT曲线会向左偏移,最快析出的鼻尖温度由910℃降低到900℃,析出的开始时间提前,由65 s缩短至50 s,析出开始的孕育时间减少;此外,晶粒由于形变诱导析出的作用而逐渐细化,但随着保温时间的持续延长,晶粒会由于形变诱导析出的完成继续长大直至粗化。
The two-stage controlled rolling technology of titanium microalloyed low carbon steel was simulated by Gleeble 3800 thermal simulation machine. The stress relaxation curve and precipitation-time-temperature(PTT) curve of the steel were obtained by stress relaxation method. The precipitation rule of titanium microalloyed steel during deformation was studied. The results show that the microstructure of the titanium microalloyed steel is remarkably refined after two-stage rolling. Compared with the stress relaxation curves under different deformation, with the increase of deformation amount, the stress relaxation speed increases, the PTT curve of strain-induced precipitation shifts to the left, the nose temperature decreases from 910 ℃ to 900 ℃, the start time of precipitation is advanced from 65 s to 50 s, and the incubation time at the beginning of precipitation decreases. In addition, the grain is gradually refined due to the stress-induced precipitation, but with the continuous prolongation of holding time, the grain will continue to grow up until coarsening due to the completion of stress-induced precipitation.
The two-stage controlled rolling technology of titanium microalloyed low carbon steel was simulated by Gleeble 3800 thermal simulation machine. The stress relaxation curve and precipitation-time-temperature(PTT) curve of the steel were obtained by stress relaxation method. The precipitation rule of titanium microalloyed steel during deformation was studied. The results show that the microstructure of the titanium microalloyed steel is remarkably refined after two-stage rolling. Compared with the stress relaxation curves under different deformation, with the increase of deformation amount, the stress relaxation speed increases, the PTT curve of strain-induced precipitation shifts to the left, the nose temperature decreases from 910 ℃ to 900 ℃, the start time of precipitation is advanced from 65 s to 50 s, and the incubation time at the beginning of precipitation decreases. In addition, the grain is gradually refined due to the stress-induced precipitation, but with the continuous prolongation of holding time, the grain will continue to grow up until coarsening due to the completion of stress-induced precipitation.
引文
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[2] Shanmugam S,Ramisetti N K,Misra R D,et al.Microstructure and high strength-toughness combination of a new 700 MPa Nb-microalloyed pipeline steel[J].Materials Science and Engineering A,2008,478(1/2):26-37.
[3] 雍岐龙,马鸣图,吴宝榕.微合金钢-物理和力学冶金[M].北京:机械工业出版,1989.
[4] 王祖滨,东涛.低合金高强度钢[M].北京:原子能出版社,1996.
[5] Medina S F,Mancilla J E.Static recrystallization of austenite and strain induced precipitation kinetics in titanium microalloyed steels[J].Acta Metallurgica Et Materialia,1994,42(12):3945-3951.
[6] Medina S F,Quispe A,Gómez M,et al.Strain induced precipitation effect on austenite static recrystallisation in microalloyed steels[J].Materials Science and Technology,2003,19(1):99-108.
[7] Mao X P,Huo X D,Sun X J,et al.Strengthening mechanisms of a new 700 MPa hot rolled Ti-microalloyed steel produced by compact strip production[J].Journal of Materials Processing Technology,2010,210(12):1660-1669.
[8] Gladman T,Holmes B,Mcivor I D,et al.The effects of second phase particles on the mechanical properties of steel[C].The Iron and Steel Institute,London,1971,68-78.
[9] Hall E O.The deformation and ageing of mild steel:II characteristics of the luders deformation[J].Proceedings of the Royal Society of London Series B,1951,64(9):742-747.
[10] Petch N J.The orientation relationships between cementite and-iron[J].Acta Crystallographica,1953,6(1):96-96.
[11] 霍向东,董锋,彭政务,等.钛微合金高强钢控轧控冷工艺研究[J].钢铁钒钛,2014(6):35-40.HUO Xiang-dong,DONG Feng,PENG Zheng-wu,et al.Study on controlled rolling and cooling technology of Ti micro-alloyed high strength steel[J].Iron Steel Vanadium Titanium,2014(6):35-40.
[12] 孙健,孙潭,薛恒旭,等.钛微合金化模具钢应力松过程中的特征曲线[J].材料热处理学报,2018,39(10):59-66.SUN Jian,SUN Tan,XUE Heng-xu,et al.Characteristic curve of titanium microalloyed die steel during stress relaxation[J].Transactions of Materials and Heat Treatment,2018,39(10):59-66.
[13] 霍向东,侯亮,李烈军,等.钛微合金化高强钢的再结晶规律[J].材料热处理学报,2017,38(4):119-125.HUO Xiang-dong,HOU Liang,LI Lie-jun,et al.Recrystallization of titanium micro-alloyed high strength steel[J].Transactions of Materials and Heat Treatment,2017,38(4):119-125.
[14] Kim Y W,Song S W,Seo S J,et al.Development of Ti and Mo micro-alloyed hot-rolled high strength sheet steel by controlling thermomechanical controlled processing schedule[J].Materials Science and Engineering A,2013,565:430-438.
[15] 毛新平,孙新军,汪水泽,等.薄板坯连铸连轧流程钛微合金钢控制轧制技术[J].钢铁,2016,51(1):52-59.MAO Xin-ping,SUN Xin-jun,WANG Shui-ze,et al.Control rolling technology of Ti-microalloyed strip produced by TSCR[J].Iron and Steel,2016,51(1):52-59.
[16] Liu W J,Jonas J J.A stress relaxation method for following carbonitride precipitation in austenite at hot working temperatures[J].Metallurgical and Materials Transactions A,1988,19(6):1403-1413.