Effect of Heat Input on Low-temperature Flexibility of Weld Seams of a Hull Steel via Gas-shielded Welding with Filler of Marine High Strength Flux-cored Wire

doi:10.11901/1005.3093.2017.527

Chinese Journal of Materials Research

2018, Vol. 32

Issue (4): 309-314 DOI: 10.11901/1005.3093.2017.527

ARTICLES

Current Issue | Archive | Adv Search

Effect of Heat Input on Low-temperature Flexibility of Weld Seams of a Hull Steel via Gas-shielded Welding with Filler of Marine High Strength Flux-cored Wire

Yayun ZHANG^1,², Jinshan WEI², Tongbang AN², Yusong XU¹(

), Chengyong MA²

1 College of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212000, China
2 Welding Research Institute of Iron and Steel Research Institute, Beijing 100081, China

Cite this article:

Yayun ZHANG, Jinshan WEI, Tongbang AN, Yusong XU, Chengyong MA. Effect of Heat Input on Low-temperature Flexibility of Weld Seams of a Hull Steel via Gas-shielded Welding with Filler of Marine High Strength Flux-cored Wire. Chinese Journal of Materials Research, 2018, 32(4): 309-314.

Download:

HTML

PDF(4853KB)
Export: BibTeX | EndNote (RIS)

Abstract

Plates of a hull steel were weld via CO₂ gas-shielded arc welding with marine high strength flux-cored wire as filler and by three different heat inputs i.e. 8 kJ/cm,14 kJ/cm and 20 kJ/cm respectively, while the effect of heat input on the microstructure and low-temperature flexibility of the weld seams was investigated by means of optical microscopy, scanning electron microscopy, transmission electron microscopy and materials-electron backscatter diffraction. Results show that the microstructure of the weld metal consists of mainly acicular ferrite, ferrite side-plate and a small amount of residual austenite for three different heat inputs. As the heat input increases the ferrite changes from acicular to lath, in which the acicular ferrite content decreases, side-plate ferrite increases and the residual austenite between them also changes from film-like to block. In addition, with the increasing heat input, inclusions with diameter below 1 μm in the deposited metal decrease, while the total amount of inclusions increases, and the large angle grain boundaries between the strips decrease. Consequently, the low-temperature flexibility of the weld seam decreases, and the fracture surface also transformed from dimple- and quasi cleavage-like to cleavage-like.

Key words: metallic materials flux-cored wire heat input microstructure inclusion low-temperature flexibility

Received: 06 September 2017

	Service

	E-mail this article
	Add to citation manager
	E-mail Alert
	RSS
	（）
	Articles by authors
	Yayun ZHANG
	Jinshan WEI
	Tongbang AN
	Yusong XU
	Chengyong MA

URL:

https://www.cjmr.org/EN/10.11901/1005.3093.2017.527 OR https://www.cjmr.org/EN/Y2018/V32/I4/309

Table 1 Welding parameters

Fig.1 Groove diagram (unit: mm)

Table 2 Chemical composition of deposited metal under different heat input (mass fraction, %)

Fig.2 OM images of weld seam with three kinds of heat input (a) 8 kJ/cm, (b) 14 kJ/cm, (c) 20 kJ/cm

Fig.3 TEM images of three kinds of heat input welds (a) 8 kJ/cm, (b) 14 kJ/cm, (c) 20 kJ/cm

Fig.4 Bulk morphology and diffraction pattern of retained austenite under 20 kJ/cm heat input (a) dark field phase, (b) bright field phase, (c) diffraction pattern

Fig.5 TEM diagram of inclusions

Fig.6 Dimension distribution of inclusions (a) 8 kJ/cm, (b) 14 kJ/cm, (c) 20 kJ/cm

Table 3 Statistics of inclusions

Fig.7 Relation between heat input and grain boundary misorientation distribution

Table 4 Effect of heat input on strength

Fig.8 Effect of heat input on the toughness

Fig.9 Fracture surface diagram of weld (a) 8 kJ/cm, (b) 14 kJ/cm, (c) 20 kJ/cm

[1]	Liu P C, Zheng Z, Fu B Q.SF-36E flux cored wire and GY945 solid wire test [A]. The 9th National Welding Symposium[C]. Harbin, 1999(刘培晟, 郑赞, 傅炳起. SF-36E药芯焊丝和GY945实芯焊丝的比较试验研究 [A]. 第九次全国焊接会议论文集[C]. 哈尔滨,1999)
[2]	Li L S, Luan J Y, Sun X H, et al.Analysis of development of welding materials in China oen[J], China Electrical Equipment Industry, 2010, (1): 10(李连胜, 栾敬岳, 孙晓红等. 我国焊接材料发展状况浅析[J], 电器工业, 2010, (1): 10)
[3]	Song F Y, Li Y M, Wang P, et al.Effects of heat input on the microstructure and impact toughness of a new flux cored wire deposited metal[J]. Acta Metall Sin, 2016, 52(7): 890(宋峰雨, 李艳梅, 王平等. 热输入量对一种新型药芯焊丝熔敷金属组织及冲击韧性的影响[J]. 金属学报, 2016, 52(7): 890)
[4]	Jorge J C F, Souza L F G, Rebello J M A. The effect of chromium on the microstructure/toughness relationship of C-Mn weld metal deposits[J]. Mater. Charact, 2001, 47(3-4): 195
[5]	Zhang D Q.Study on formation mechanism of acicular ferrite in weld metal of microalloyed steel[D]. Tianjin: Tianjin University, 2000(张德勤. 微合金钢焊缝金属中针状铁素体形成机理的研究[D]. 天津: 天津大学, 2000)
[6]	Zhang W Y.Welding Metallurgy[M]. Beijing: Metallurgy Machinery Industry Press, 2004)(张文钺. 焊接冶金学[M]. 北京: 机械工业出版社, 2004)
[7]	Bhadeshia H K D H, Edmonds D V. The bainite transformation in a silicon steel[J]. Metall. Mater. Trans. A, 1979, 10(7): 895
[8]	Biss V, Cryderman R L.Martensite and retained austenite in hot-rolled, low-carbon bainitic steels[J]. Metall. Mater. Trans. B, 1971, 2(8): 2267
[9]	Huang A G, Yu S F, Xie M L, et al.Microstructure of acicular ferrite in weld of low alloy steel[J]. Trans China Weld Inst, 2008, 29(3): 45(黄安国, 余圣甫, 谢明立等. 低合金钢焊缝的针状铁素体微观组织[J]. 焊接学报, 2008, 29(3):45)
[10]	Ricks R A, Howell P R, Barritte G S.The nature of acicular ferrite in HSLA steel weld metals[J]. J. Mater. Sci., 1982, 17(3): 732
[11]	An T B, Shan J G, Wei J S, et al.Influence of heat input on microstructure and properties of steel joint for 1000MPa engineering machinery[J]. Chin J Mech Eng, 2014, 50(22): 42(安同邦, 单际国, 魏金山等. 热输入对1000 MPa级海洋工程用钢接头组织性能的影响[J]. 机械工程学报, 2014, 50(22): 42)
[12]	Xiao X M, Peng Y, Ma C Y, et al, Influence of shielding gas on microstructure and toughness of 440 MPa HSLA steel with GMAW[J]. Trans China Weld Inst, 2013, 34(7): 101(肖晓明, 彭云, 马成勇等. 保护气体对440MPa HSLA钢GMAW焊缝组织及韧性的影响[J]. 焊接学报, 2013, 34(7): 101)
[13]	Lan L Y, Qiu C L, Zhao D W, et al.Microstructure characteristics and toughness of different sub regions in welding heat affected zone of low carbon bainitic steel[J]. Acta Metall Sin., 2011, 47(8): 1046(兰亮云, 邱春林, 赵德文等. 低碳贝氏体钢焊接热影响区中不同亚区的组织特征与韧性[J]. 金属学报, 2011, 47(8): 1046)
[14]	Cui Y X, Wang C L.Fracture Analysis of Metal [M]. Harbin: Harbin Institute of Technology press, 1998(崔约贤, 王长利. 金属断口分析[M]. 哈尔滨: 哈尔滨工业大学出版社, 1998)

[1]	MAO Jianjun, FU Tong, PAN Hucheng, TENG Changqing, ZHANG Wei, XIE Dongsheng, WU Lu. Kr Ions Irradiation Damage Behavior of AlNbMoZrB Refractory High-entropy Alloy[J]. 材料研究学报, 2023, 37(9): 641-648.
[2]	SONG Lifang, YAN Jiahao, ZHANG Diankang, XUE Cheng, XIA Huiyun, NIU Yanhui. Carbon Dioxide Adsorption Capacity of Alkali-metal Cation Dopped MIL125[J]. 材料研究学报, 2023, 37(9): 649-654.
[3]	ZHAO Zhengxiang, LIAO Luhai, XU Fanghong, ZHANG Wei, LI Jingyuan. Hot Deformation Behavior and Microstructue Evolution of Super Austenitic Stainless Steel 24Cr-22Ni-7Mo-0.4N[J]. 材料研究学报, 2023, 37(9): 655-667.
[4]	SHAO Hongmei, CUI Yong, XU Wendi, ZHANG Wei, SHEN Xiaoyi, ZHAI Yuchun. Template-free Hydrothermal Preparation and Adsorption Capacity of Hollow Spherical AlOOH[J]. 材料研究学报, 2023, 37(9): 675-684.
[5]	XING Dingqin, TU Jian, LUO Sen, ZHOU Zhiming. Effect of Different C Contents on Microstructure and Properties of VCoNi Medium-entropy Alloys[J]. 材料研究学报, 2023, 37(9): 685-696.
[6]	OUYANG Kangxin, ZHOU Da, YANG Yufan, ZHANG Lei. Microstructure and Tensile Properties of Mg-Y-Er-Ni Alloy with Long Period Stacking Ordered Phases[J]. 材料研究学报, 2023, 37(9): 697-705.
[7]	PAN Xinyuan, JIANG Jin, REN Yunfei, LIU Li, LI Jinghui, ZHANG Mingya. Microstructure and Property of Ti / Steel Composite Pipe Prepared by Hot Extrusion[J]. 材料研究学报, 2023, 37(9): 713-720.
[8]	XU Lijun, ZHENG Ce, FENG Xiaohui, HUANG Qiuyan, LI Yingju, YANG Yuansheng. Effects of Directional Recrystallization on Microstructure and Superelastic Property of Hot-rolled Cu71Al18Mn11 Alloy[J]. 材料研究学报, 2023, 37(8): 571-580.
[9]	XIONG Shiqi, LIU Enze, TAN Zheng, NING Likui, TONG Jian, ZHENG Zhi, LI Haiying. Effect of Solution Heat Treatment on Microstructure of DZ125L Superalloy with Low Segregation[J]. 材料研究学报, 2023, 37(8): 603-613.
[10]	LIU Jihao, CHI Hongxiao, WU Huibin, MA Dangshen, ZHOU Jian, XU Huixia. Heat Treatment Related Microstructure Evolution and Low Hardness Issue of Spray Forming M3 High Speed Steel[J]. 材料研究学报, 2023, 37(8): 625-632.
[11]	YOU Baodong, ZHU Mingwei, YANG Pengju, HE Jie. Research Progress in Preparation of Porous Metal Materials by Alloy Phase Separation[J]. 材料研究学报, 2023, 37(8): 561-570.
[12]	REN Fuyan, OUYANG Erming. Photocatalytic Degradation of Tetracycline Hydrochloride by g-C₃N₄ Modified Bi₂O₃[J]. 材料研究学报, 2023, 37(8): 633-640.
[13]	WANG Hao, CUI Junjun, ZHAO Mingjiu. Recrystallization and Grain Growth Behavior for Strip and Foil of Ni-based Superalloy GH3536[J]. 材料研究学报, 2023, 37(7): 535-542.
[14]	LIU Mingzhu, FAN Rao, ZHANG Xiaoyu, MA Zeyuan, LIANG Chengyang, CAO Ying, GENG Shitong, LI Ling. Effect of Photoanode Film Thickness of SnO₂ as Scattering Layer on the Photovoltaic Performance of Quantum Dot Dye-sensitized Solar Cells[J]. 材料研究学报, 2023, 37(7): 554-560.
[15]	QIN Heyong, LI Zhentuan, ZHAO Guangpu, ZHANG Wenyun, ZHANG Xiaomin. Effect of Solution Temperature on Mechanical Properties and γ' Phase of GH4742 Superalloy[J]. 材料研究学报, 2023, 37(7): 502-510.

No Suggested Reading articles found!

Viewed

Full text

Abstract

Cited

Shared

Discussed