Effect of Vanadium Content on Toughness in the Coarse-Grained Heat Affected Zone of Ti-V Microalloyed Steels

doi:10.3901/JME.2018.06.146

Abstract

Abstract: This composite technology of Ti-oxide metallurgy and V-microalloying for the research and development of high energy input welding steels has aroused extensive attention in the present stage. This carbon and nitride particles precipitated on the non-metallic inclusions by the composite technique, This inclusions can induce massive nucleation of the acicular ferrite in the coarse-grained heat affected zones, So as to improve the toughness of the CGHAZ. The quantitative calculation of the solid solution and precipitation of second phase particles is carried out by using the Thermo-Calc thermodynamic software. The key role of Ti, V, O, N and other elements in the formation of AF nucleation by oxidation and carbon nitride inclusions is further investigated. Meanwhile, the Ti-V microalloyed steels with V content of 0, 0.05% and 0.1% is subjected to high energy welding, The Mechanical properties and morphology is analyzed by using the thermal simulation testing machine, mechanical measuring equipment, high power electron microscope and other equipment. Through the analysis of the experimental results, it is concluded that the general law of V element in improving the strength and the CGHAZ toughness of Ti-V microalloyed steels, and further expounded the mechanism of inducing AF nucleation in the CGHAZ of Ti-V microalloyed steels.

Key words: CGHAZ, high energy input welding, inclusions, Ti-V microalloyed steel, toughness

CLC Number:

U466
U463

ZOU Zongyuan, LI Yinxiao. Effect of Vanadium Content on Toughness in the Coarse-Grained Heat Affected Zone of Ti-V Microalloyed Steels[J]. Journal of Mechanical Engineering, 2018, 54(6): 146-153.

References

[1] 王学,常建伟,陈方玉,等. 焊后热处理改善WB36钢临界再热粗晶区韧性分析[J]. 焊接学报,2008,29(3):9-12. WANG Xue,CHANG Jianwei,CHEN Fangyu,et al. The improvement of post weld heat treatment on the toughness of WB36 steel in critical reheating zone[J]. Welding Journal,2008,29(3):9-12.
[2] 李艺君,杜东旭,付瑞东. 焊后热处理对高氮奥氏体不锈钢搅拌摩擦焊接头组织及性能的影响[J]. 机械工程学报,2015,51(22):47-53. LI Yijun,DU Dongxu,FU Ruidong. Effect of post-welded heat treatment on the microstructures and mechanical properties of friction stir welded joint of high-nitrogen austenitic stainless steel[J]. Journal of Mechanical Engineering,2015,51(22):47-53.
[3] 安同邦,田志凌,单际国,等. 后热温度对1000 MPa级高强钢焊缝组织与性能的影响[J]. 机械工程学报,2015,51(4):40-46. AN Tongbang,TIAN Zhiling,SHAN Jiguo,et al. Effect of the temperature of post weld heat treatment on microstructure and performance of weld metal for 1000 MPa grade high strength steel[J]. Journal of Mechanical Engineering,2015,51(4):40-46.
[4] 习小军,赖朝彬,吴春红,等. 大线能量焊接船板钢的研究现状与发展[J]. 有色金属科学与工程,2016,7(5):55-60. XI Xiaojun,LAI Chaobin,WU Chunhong,et al. Research situation and development of ship plate steel by high heat input welding[J]. Nonferrous Metals Science and Engineering,2016,7(5):55-60.
[5] 刘振宇,唐帅,陈俊,等. 海洋平台用钢的研发生产现状与发展趋势[J]. 鞍钢技术,2015(1):1-7. LIU Zhenyu,TANG Shuai,CHEN Jun,et al. Latest progress on development and production of steels for offshore platform and their development tendency[J]. Angang Technology,2015(1):1-7.
[6] 刘岩,王凯,王建明,等. 大线能量焊接条件下低合金高强度钢针状铁素体形核影响因素及形核机理研究[J]. 材料导报,2016,30(13):102-105. LIU Yan,WANG Kai,WANG Jian,et al. Acicular ferrite nucleation in high strength low alloy steel during high heat input welding:influence and mechanism[J]. Material Report,2016,30(13):102-105.
[7] 史美伦,段贵生. 氧化物冶金技术应用及进展[J]. 河南冶金,2010,18(5):1-4. SHI Meilun,DUAN Guisheng. Application and development of oxide metallurgy technology[J]. Henan Metallurgy,2010,18(5):1-4.
[8] 万响亮,李光强,吴开明. 原位观察TiN粒子对低合金高强度钢模拟焊接热影响区粗晶区晶粒细化作用[J]. 北京科技大学学报,2016,38(3):371-378. WAN Xiangliang,LI Guangqiang,WU Kaiming. In-situ observations of grain refinement by TiN particles in the simulated coarse-grained heat-affected zone of a high-strength low-alloy steel[J]. Journal of University of Science and Technology Beijing,2016,38(3):371-378.
[9] 万响亮,吴开明,王恒辉,等. 氧化物冶金技术在大线能量焊接用钢的应用[J]. 中国冶金,2015,25(6):6-12. WAN Xiangliang,WU Kaiming,WANG Henghui,et al. Application of oxide metallurgy technology in high energy welding steel[J]. China Metallurgy,2015,25(6):6-12.
[10] 师仲然,王瑞珍,王青峰,等. 钒微合金钢粗晶热影响区的组织和韧性[J]. 钢铁,2015,50(4):70-75. SHI Zhongran,WANG Ruizhen,WANG Qingfeng,et al. Microstructures and toughness of simulated CGHAZ of vanadium microalloyed steel[J]. Iron and Steel,2015,50(4):70-75.
[11] ZHANG D,TERASAKI H,KOMIZO Y I. In situ observation of the formation of intragranular acicular ferrite at non-metallic inclusions in C-Mn steel[J]. Acta Materialia,2010,58(4):1369-1378.
[12] TOMITA Y,SAITO N,TSUZULI T,et al. Improvement in HAZ toughness of steel by TiN-MnS addition[J]. ISIJ International,1994,34(10):829-835.
[13] ISHIKAWA F,TAKAHASHI T,OCHI T. Intragranular ferrite nucleation in medium-carbon vanadium steels[J]. Metallurgical & Materials Transactions A,1994,25:5(5):929-936.
[14] MIYAMOTO G,SHINYOSHI T,YAMAGUCHI J,et al. Crystallography of intragranular ferrite formed on (MnS+V(C,N)) complex precipitate in austenite[J]. Scripta Materialia,2003,48(4):371-377.
[15] SHIM J H,OH Y J,SUH J Y,et al. Ferrite nucleation potency of non-metallic inclusions in medium carbon steels[J]. Acta Materialia,2001,49(12):2115-2122.
[16] CROWTHER Y L D. N,GREEN M J W,MITCHELL P S,et al. The effect of vanadium and niobium on the properties and microstructure of the intercritically reheated coarse grained heat affected zone in low carbon microalloyed steels[J]. ISIJ International,2001,41(1):46-55.
[17] WANG Chao,WANG Zhaodong,WANG Guodeng. Effect of hot deformation and controlled cooling process on microstructures of Ti-Zr deoxidized low carbon steel[J]. ISIJ International,2016,56(10):1800-1807.
[18] 雍岐龙. 钢铁材料中的第二相[M]. 北京:冶金工业出版社,2006. YONG Qilong. The second phase in Iron and steel materials[M]. Beijing:Metallurgical Industry Press,2006.
[19] HORⅡ Y,OHKITA S,WAKABAYASHI M,et al. Study on the toughness of large-heat Input weld metal for low temperature-service TMCP steel[J]. Nippon Steel Tech. Rep.,1988,3(7):1-9.
[20] HE K,EDMONDS D V. Formation of acicular ferrite and influence of vanadium alloying[J]. Materials Science & Technology,2002,18(3):289-296.
[21] 胡志勇,杨成威,姜敏,等. Ti脱氧钢含Ti复合夹杂物诱导晶内针状铁素体的原位观察[J]. 金属学报,2011,47(8):971-977. HU Zhiyong,YANG Chengwei,JIANG Min,et al. In situ observation of intragranular acicular ferrite on complex titanitum-containing inclusions in titanitum deoxidized[J]. Acta Metallurgica Sinica,2011,47(8):971-977.
[22] 钟群鹏,赵子华. 断口学[M]. 北京:高等教育出版社,2006. ZHONG Qunpeng,ZHAO Zihua. Fractography[M]. Beijing:Higher Education Press,2006.
[23] BABU S S. The mechanism of acicular ferrite in weld deposits[J]. Current Opinion in Solid State & Materials Science,2004,8(3):267-278.
[24] 万响亮,李光强,吴开明. 低合金高强钢针状铁素体组织特征和形成机理[J]. 钢铁研究学报,2016,28(6):1-12. WANG Xiangliang,LI Guangqiang,WU Kaiming. Microstructure characteristics and formation mechanism of of acicular ferrite in high-strength low-alloy steel[J]. Journal of Iron and Steel Research,2016,28(6):1-12.
[25] JI-YONG P,PARK J K,CHOO W Y. Effect of Ti addition on the potency of MnS for ferrite nucleation in C-Mn-V steels[J]. ISIJ International,2000,40(12):1253-1259.