Effect of Zr Treatment on Nitride in Low Carbon Ti-Microalloyed Steels

doi:10.12068/j.issn.1005-3026.2021.12.006

Abstract

Abstract: The effect of Zr content on nitrides in low carbon Ti-microalloyed steels was studied by experiment and thermodynamic calculation.The results show that with the increase of Zr content from 0.0020% to 0.0200%， the number density and area proportion of nitrides increase obviously. The type of nitrides gradually changes from TiN to (Ti_○y，Zr_○1-y)N and the Zr/Ti atomic ratio in (Ti_○y，Zr_○1-y)N increases. The main nitrides in (Ti_○y，Zr_○1-y)N gradually changes from TiN to ZrN. The thermodynamic calculation results show that there is no precipitation of TiN， ZrN and other nitrides in the refining process， and nitrides mainly precipitate in the solidification process. When Zr content is 0.0020%， only TiN precipitates during solidification， whereas when Zr content is more than 0.0046%ZrN precipitates at the late stage of solidification. As the temperature decreases， (Ti_○y，Zr_○1-y)N fulfills the thermodynamic precipitation conditions. When Zr content increases from 0.0046% to 0.0200%， the precipitation temperature of (Ti_○y，Zr_○1-y)N increases， but the ratio of TiN in (Ti_○y，Zr_○1-y)N decreases. Finally， when Zr-Ti composite deoxidization is adopted， the mass fraction of Zr in steels should be controlled within the range of 0.0020%~0.0050%.

Key words: Zr treatment; low carbon Ti-microalloyed steels; TiN; ZrN; (Ti_○y，Zr_○1-y)N

CLC Number:

TF769.2

YANG Yong-kun， ZHAN Dong-ping， JIANG Zhou-hua， LEI Hong. Effect of Zr Treatment on Nitride in Low Carbon Ti-Microalloyed Steels[J]. Journal of Northeastern University(Natural Science), 2021, 42(12): 1709-1716.

References

[1]Ma Z，Janke D.Characteristics of oxide precipitation and growth during solidification of deoxidized steel［J］.ISIJ International，1998，38(1):46-52.
[2]Mu W，Jnsson P G，Nakajima K.Recent aspects on the effect of inclusion characteristics on the intragranular ferrite formation in low alloy steels:a review［J］.High Temperature Materials and Processes，2017，36(4):309-325.
[3]余圣甫，雷毅，黄安国，等.氧化物冶金技术及其应用［J］.材料导报，2004，18(8):50-52.(Yu Sheng-fu，Lei Yi，Huang An-guo，et al.Oxide metallurgy technology and its application ［J］.Materials Reports，2004，18(8):50-52.)
[4]战东平，唐磊，姜周华，等.硫质量分数对Ti-Zr脱氧E36钢中夹杂物的影响［J］.东北大学学报(自然科学版)，2015，36(9):1273-1277.(Zhan Dong-ping，Tang Lei，Jiang Zhou-hua，et al.Effect of sulfur mass fraction on inclusions in steel E36 deoxidized by titanium and zirconium ［J］.Journal of Northeastern University(Natural Science)，2015，36(9):1273-1277.)
[5]Tomita Y，Saito N，Tsuzuki T，et al.Improvement in HAZ toughness of steel by TiN-MnS addition ［J］.ISIJ International，1994，34(10):829-835.
[6]Kanazawa S，Nakashima A，Okamoto K，et al.Improved toughness of weld fussion zone by fine TiN particles and development of a steel for large heat input welding ［J］.Tetsu-to-Hagané，1975，11(61):2589-2603.
[7]Shim J H，Cho Y W，Chung S H，et al.Nucleation of intragranular ferrite at Ti₂O₃ particle in low carbon steel ［J］.Acta Materialia， 1999，47(9):2751-2760.
[8]Lee T K，Kim H J，Kang B Y，et al.Effect of inclusion size on the nucleation of acicular ferrite in welds［J］.ISIJ International， 2000，40(12):1260-1268.
[9]Yamamoto K，Hasegaw T，Takamura J I.Effect of boron on intra-granular ferrite formation in Ti-oxide bearing steels ［J］.ISIJ International，1996，36(1):80-86.
[10]Nako H，Okazaki Y，Speer J G.Acicular ferrite formation on Ti-rare earth metal-Zr complex oxides［J］.ISIJ International，2015，55(1):250-256.
[11]Park J S，Park J H.Effect of Mg-Ti deoxidation on the formation behavior of equiaxed crystals during rapid solidification of iron alloys［J］.Steel Research International，2014，85(8):1303-1309.
[12]Baker T N.Role of zirconium in microalloyed steels:a review ［J］.Materials Science and Technology， 2015，31(3):265-294.
[13]Sawai T，Wakoh M，Ueshima Y，et al.Analysis of oxide dispersion during solidification in Ti，Zr-deoxidized steels［J］.ISIJ International，1992，32(1):169-173.
[14]Sawai T，Wakoh M，Mizoguchi S.Effect of Zr-oxide particles on the MnS precipitation in low S steels［J］.Tetsu-to-Hagané，1996，82(7):587-592.
[15]Yang Y K，Zhan D P，Lei H，et al.Formation of non-metallic inclusion and acicular ferrite in Ti-Zr deoxidized steel ［J］.ISIJ International，2019，59(9):1545-1551.
[16]Yang Y K，Zhan D P，Lei H，et al.In situ observation of acicular ferrite nucleation and growth at different cooling rate in Ti-Zr deoxidized steel ［J］.Metallurgical and Materials Transactions B，2019，50B:2536-2546.
[17]Yang Y K，Zhan D P，Lei H，et al.Coupling effect of prior austenite grain size and inclusion characteristics on acicular ferrite formation in Ti-Zr deoxidized low carbon steel ［J］.Metallurgical and Materials Transactions B，2020，51B:480-491.
[18]Chai F，Yang C F，Su H，et al.Effect of Zr addition to Ti-killed steel on inclusion formation and microstructural evolution in welding induced coarse-grained heat affected zone ［J］.Acta Metallurgica Sinica(English Letters)，2008，21(3):220-226.
[19]Wan X L，Wu K M，Cheng L，et al.In-situ observations of acicular ferrite growth behavior in the simulated coarse-grained heat-affected zone of high-strength low-alloy steels ［J］.ISIJ International，2015，55(3):679-685.
[20]郭银涛.含硫易切结构钢精炼工艺优化及钢中硫化物形态控制的研究［D］.重庆:重庆大学，2017.(Guo Yin-tao.Study on refining process optimization and sulfide morphology control for resulfurized free-cutting structural steel ［D］.Chongqing:Chongqing University，2017.)
[21]李言栋.稀土耐热钢中夹杂物行为控制的基础研究［D］.沈阳:东北大学，2016.(Li Yan-dong.Fundamental study of inclusions behavior in heat resistant steel containing rare earth elements ［D］.Shenyang:Northeastern University，2016.)
[22]Won Y M，Thomas B G.Simple model of microsegregation during solidification of steels ［J］.Metallurgical and Materials Transactions A，2001，32(7):1755-1767.
[23]Diederichs R，Bleck W.Modelling of manganese sulphide formation during solidification，part I:description of MnS formation parameters［J］.Steel Research International，2006，77(3):202-209.
[24]Jin Y L，Du S L.Precipitation behavior and control of TiN inclusions in rail steels［J］.Ironmaking &Steelmaking，2018，45(3):224-229.
[25]Bizyukov P V，Giese S R.Effects of Zr，Ti，and Al additions on nonmetallic inclusions and impact toughness of cast low-alloy steel［J］.Journal of Materials Engineering and Performance，2017，26(4):1878-1889.
[26]Sigworth G K，Elliott J F.The thermodynamics of liquid dilute iron alloys［J］.Metal Science， 1974，8(1):298-310.
[27]曲英.炼钢过程的物理化学计算［M］.北京:冶金工业出版社，1993.(Qu Ying.Physicochemical calculation of steelmaking process ［M］.Beijing:Metallurgical Industry Press，1993.)
[28]Choudhary S K，Ghosh A.Mathematical model for prediction of composition of inclusions formed during solidification of liquid steel［J］.ISIJ International， 2009，49(12):1819-1827.
[29]Ueshima Y，Mizoguchi S，Matsumiya T，et al.Analysis of solute distribution in dendrites of carbon steel with δ/γ transformation during solidification［J］.Metallurgical Transactions B，1986，17(4):845-859.
[30]Kim M J，Cho H H，Kim S H，et al.Effect of Zr addition on phase transformation and precipitation in B-added hot stamping steel［J］.Metals and Materials International，2013，19(4):629-635.［31］雍歧龙.钢铁材料中的第二相［M］.北京:冶金工业出版社，2006:173-176.(Yong Qi-long.Secondary phases in steels ［M］.Beijing:Metallurgical Industry Press，2006:173-176.)