Microstructure and Toughness of Heat-affected Zone of Weld Joint for Pipeline Steels with High Deformability

doi:10.11901/1005.3093.2015.307

Chinese Journal of Materials Research

2016, Vol. 30

Issue (7): 517-523 DOI: 10.11901/1005.3093.2015.307

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Microstructure and Toughness of Heat-affected Zone of Weld Joint for Pipeline Steels with High Deformability

JIA Shujun^1,^**(

), WANG Yuanfang², TAN Fengliang³, LIU Qingyou¹

1. China Iron & Steel Research Institute, Beijing 100081, China
2. Liaohe Oilfield Company, China National Petroleum Corporation, Panjin 124010, China
3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China

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JIA Shujun, WANG Yuanfang, TAN Fengliang, LIU Qingyou. Microstructure and Toughness of Heat-affected Zone of Weld Joint for Pipeline Steels with High Deformability. Chinese Journal of Materials Research, 2016, 30(7): 517-523.

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Abstract

Welding thermal cycle process of test steels containing different Nb was investigated under different heat inputs with a Gleeble-3800 thermo-mechanical simulator. The microstructural characteristics of the coarse-grained heat-affected zone (CGHAZ) were observed by using optical microscope (OM), scanning electron microscope (SEM) and electron backscatter diffraction (EBSD), while their impact toughness was tested. The results indicate that with the increasing heat input, lath bainite transformed gradually into granular bainite, and the size and proportion of M/A islands increased, while the average grain size also increased. Under the same heat input, austenite in high Nb steel was refined obviously, with more dispersive and refined M/A islands distributed in the microstructure of high Nb steel, and the proportion of high angle boundaries was high. With the increasing heat input, the impact toughness of steels decreased sharply. The critical heat input value for a sharp decrease in impact toughness were approximately 35 kJ/cm for high Nb steel and 25 kJ/cm for low Nb steel. However, the impact toughness of the high Nb steel was significantly higher than that of the lower Nb steel in the range of experimental parameters.

Key words: metallic materials high-deformability pipeline steel CGHAZ heat input grain size M/A islands toughness

Received: 13 August 2015

Fund: *Supported by National High Technology Researchand Development Program of China No.2013AA09A219

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	Shujun JIA
	Yuanfang WANG
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	Qingyou LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.307 OR https://www.cjmr.org/EN/Y2016/V30/I7/517

Table 1 Composition analysis of test steels (%, mass fraction)

Table 2 Mechanical properties of test steels

Fig.1 Microstructure morphology of test steels (a) A steel; (b) B steel

Fig.2 Process of welding thermal simulation

Fig.3 Effect of heat input on microhardness and toughness of test steels (a) microhardness, (b) toughness

Table 3 Relationship between T8/3 and heat inputs

Fig.4 Austenite morphology of two test steels in 16 kJ/cm (a) A steel; (b) B steel

Fig.5 Microstructure of two test steels in different heat inputs(a) ~(c) A steel; (d) ~ (f) B steel (a) and (d): 16 kJ/cm; (b) and (e): 28 kJ/cm; (c) and (f): 51 kJ/cm

Fig.6 SEM of test steel in 16 kJ/cm (a) A steel; (b) B steel

Fig.7 TEM of B steel in 16 kJ/cm (a) Parallel ferrite lath; (b) M/A island

Fig.8 SEM of B steel in different heat inputs (a) 32 kJ/cm; (b) 41 kJ/cm

Fig.9 Orientation maps of bcc phase in the samples welded under heat inputs of 20.8 kJ/cm and 51 kJ/cm and inverse pole figure (IPF) legend (a), (b): 20.8 kJ/cm; (c), (d): 51 kJ/cm; (a), (c) maps of grain boundary distribution; (b), (d) maps of orientation imaging

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