等温工艺对钛微合金钢组织和析出行为的影响
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摘要
采用Gleeble-3800热力模拟机、维氏硬度计、透射电镜等研究了等温工艺对Ti微合金钢组织性能和析出行为影响。结果表明:实验钢在675℃等温时铁素体转变速度最快;随着等温温度降低,析出的TiC体积分数逐渐增大,沉淀强化效果增强,维氏硬度升高;随等温时间延长,TiC粒子在铁素体晶粒内持续析出,维氏硬度增大,硬度分布更加集中;在650℃等温600 s时,析出强化量约为142 MPa。
The effects of isothermal process on microstructure, properties and precipitation behavior of Ti microalloyed steel were studied by means of Gleeble-3800 thermal mechanical simulator, Vickers hardness tester and transmission electron microscopy. The results show that the ferrite transformation rate of the tested steel is the fastest at 675 ℃, and with the decrease of isothermal temperature, the volume fraction of TiC precipitates increases gradually, the precipitation strengthening effect increases, and the Vickers hardness increases. With the increase of isothermal time, TiC particles continue to precipitate in ferrite grains, and the Vickers hardness increases and the hardness distribution is more concentrated, and after isothermal treatment at 650 ℃ for 600 s, the strengthening increment of precipitation strengthening is about 142 MPa.
The effects of isothermal process on microstructure, properties and precipitation behavior of Ti microalloyed steel were studied by means of Gleeble-3800 thermal mechanical simulator, Vickers hardness tester and transmission electron microscopy. The results show that the ferrite transformation rate of the tested steel is the fastest at 675 ℃, and with the decrease of isothermal temperature, the volume fraction of TiC precipitates increases gradually, the precipitation strengthening effect increases, and the Vickers hardness increases. With the increase of isothermal time, TiC particles continue to precipitate in ferrite grains, and the Vickers hardness increases and the hardness distribution is more concentrated, and after isothermal treatment at 650 ℃ for 600 s, the strengthening increment of precipitation strengthening is about 142 MPa.
引文
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[2] 李晓林,蔡庆伍,余伟.钒氮微合金化对ULCB钢组织性能和析出行为的影响[J].金属热处理,2013,38(1):35-39.LI Xiao-lin,CAI Qing-wu,YU Wei.Effect of V-N microalloying on precipitation behaviors microstructure and properties of ultra-low carbon bainitic[J].Heat Treatment of Metals,2013,38(1):35-39.
[3] 朱明原,鲁泽凡,黄飞,等.第二相粒子对V-Ti微合金油井管钢力学性能的影响[J].金属热处理,2011,36(12):70-73.ZHU Ming-yuan,LU Ze-fan,HUANG Fei,et al.Effect of secondary phase particles on V-Ti microalloy steel of oil country tubular goods (OCTG) mechanical properties[J].Heat Treatment of Metals,2011,36(12):70-73.
[4] Funakawa Y,Shiozaki T,Tomita K,et al.Development of high strength hot-rolled sheet steel consisting of ferrite and nanometer-sized carbides[J].ISIJ International,2004,44(11):1945-1951.
[5] 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,2014,35(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,2014,35(6):35-40.
[6] Huo X D,Li L J,Peng Z W,et al.Effect of TMCP schedule on precipitation microstructure and properties of Ti-microalloyed high strength steel[J].Journal of Iron and Steel Research,International,2016,23(6):593-601.
[7] Yan H W,Huang C Y,Yang Z R.Characterization of interphase-precipitated nanometer-sized carbides in a Ti-Mo-bearing steel[J].Scripta Materialia,2009,61(6):616-619.
[8] Yan H W,Chen P Y,Huang C Y,et al.Interphase precipitation of nanometer-sized carbides in a titanium-molybdenum-bearing low-carbon steel[J].Acta Materialia,2011,59(16):6264-6274.
[9] Yan H W,Chen P Y,Wang T Y,et al.Orientation relationship transition of nanometre sized interphase precipitated TiC carbides in Ti bearing steel[J].Materials Science and Technology,2010,26(4):421-30.
[10] Okamoto R,Borgenstam A,Agren J.Interphase precipitation in niobium-microalloyed steels[J].Acta Materialia,2010,58(14):4783-4790.
[11] Zhang Y J,Miyamoto G,Shinbo K,et al.Effects of transformation temperature on VC interphase precipitation and resultant hardness in low-carbon steels[J].Acta Materialia,2015,84:375-384.
[12] Xu Y,Zhang W,Sun M,et al.The blocking effects of interphase precipitation on dislocations movement in Ti-bearing micro-alloyed steels[J].Materials Letters,2015,139:177-181.
[13] 董浩凯,陈浩,张弛,等低合金钢中纳米碳化物相间析出行为的研究进展[J].中国材料进展,2018(6):1-7.DONG Hao-kai,CHEN Hao,ZHANG Chi,et al.An overview of interphase precipitation of nano-carbide in low alloy steels[J].Materials China,2018(6):1-7.
[14] 雍岐龙.钢铁材料中的第二相[M].北京:冶金工业出版社,2006.
[15] Chen C Y,Yen H W,Kao F H,et al.Precipitation hardening of high-strength low-alloy steels by nanometer-sized carbides[J].Materials Science and Engineering A,2009,499(1):162-166.
[16] Bhadeshia H K D H.Diffusional transformations:A theory for the formation of superledges[J].Physica Status Solid Applied Research 1982,69(2):745-750.
[17] 彭政务.钛微合金化热轧高强度钢板的强韧化机理研究[D].广州:华南理工大学,2016.PENG Zheng-wu.Research on the strengthening and toughening mechanisms of Ti microalloyed hot-rolled high-strength steel plates[D].Guangzhou:South China University of Technology,2016.
[18] 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):1660-1666.
[19] 王长军,雍岐龙,孙新军,等.Ti和Mn含量对CSP工艺Ti微合金钢析出特征与强化机理的影响[J].金属学报,2011,47(12):1541-1549.WANG Chang-jun,YONG Qi-long,SUN Xin-jun,et al.Effects Ti and Mn contents on the precipitata characteristics and strengthening mechanism in ti microalloyed steels producedby CSP[J].Acta Metallurgica Sinica,2011,47(12):1541-1549.
[20] Misra R D K,Nathani H,Hartmann J E,et al.Microstructural evolution in a new 770 MPa hot rolled Nb-Ti microalloyed steel[J].Materials Science and Engineering A,2005,394:339-352.
[21] 汪小培,赵爱民,赵征志,等.Ti微合金钢中纳米尺寸碳化物的析出强化[J].金属热处理,2014,39(4):19-22.WANG Xiao-pei,ZHAO Ai-min,ZHAO Zheng-zhi,et al.Precipitation strengthening of nanometer-sized carbides in Ti micro-alloyed steel[J].Heat Treatment of Metals,2014,39(4):19-22.