Annealing Process Optimization of High Frequency Longitudinal Resistance Welded Low-CarbonFerritic Stainless Steel Pipe

doi:10.11900/0412.1961.2019.00051

Acta Metall Sin

2019, Vol. 55

Issue (11): 1367-1378 DOI: 10.11900/0412.1961.2019.00051

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Annealing Process Optimization of High Frequency Longitudinal Resistance Welded Low-CarbonFerritic Stainless Steel Pipe

SHAO Yi ,LI Yanmo ,LIU Chenxi (

),YAN Zesheng ,LIU Yongchang

State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, China

Cite this article:

SHAO Yi , LI Yanmo , LIU Chenxi , YAN Zesheng , LIU Yongchang . Annealing Process Optimization of High Frequency Longitudinal Resistance Welded Low-CarbonFerritic Stainless Steel Pipe. Acta Metall Sin, 2019, 55(11): 1367-1378.

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Abstract

With the development of economy and technology, the application of ferritic stainless steel is becoming increasingly wider. 12Cr ferritic stainless steel has low carbon equivalent and good weldability, and it can not only be applied to a variety of conditions, but also reduce the production cost. High frequency longitudinal resistance welding is an advanced welding technology with high quality and efficiency. In this work, low-carbon ferritic stainless steel pipe has been joined successfully by high frequency longitudinal resistance welding. Microstructure characteristics and mechanical properties of the stainless steel pipe joint after annealing at different temperatures for 3 min were investigated by OM, SEM, TEM and mechanical testing. In the process of high frequency longitudinal resistance welding, the weld zone was heated quickly to a high austenization temperature which led to a coarse grain structure in this zone assisted by high pressure. The weld zone presented martenite and ferrite microstructure with irregular grain. As a result, the hardness of the weld zone reached 315 HV and the impact energy dropped to near zero. After annealing at 950 ℃ for 3 min, the decomposition of martensite was the main reason of the decrease of hardness (260 HV) in weld zone. The microstructure of weld zone was composed of ferrite and bainite, resulting in the increase of impact energy from 0 to 23 J.

Key words: ferritic stainless steel high frequency resistance welding annealing impact toughness Vickers hardness

Received: 26 February 2019

ZTFLH:

TG132.33，TG113.25

Fund: National Natural Science Foundation of China(U1660201)

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	SHAO Yi
	LI Yanmo
	LIU Chenxi
	YAN Zesheng
	LIU Yongchang

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https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00051 OR https://www.ams.org.cn/EN/Y2019/V55/I11/1367

Fig.1 Calculation of phase diagram (a) and DSC curves (b) of the low-carbon ferritic stainless steel

Fig.2 OM image of welded joint (HAZ—heat affected zone)

Fig.3 XRD spectra of weld zone after annealing at different temperatures

Fig.4 OM images of microstructure of welded joint(a) weld zone (b) HAZ 1 (c) HAZ 2 (d) base metal

Fig.5 OM images of microstructures in weld zone after annealing at different temperatures for 3 min(a) 650 ℃ (b) 750 ℃ (c) 850 ℃ (d) 950 ℃

Fig.6 TEM (a), EDS (b), HRTEM (c) images and SAED pattern (d) of precipitated phase in as-annealed weld zone (d－interplanar spacing)

Fig.7 TEM images of precipitated phase in weld zone after annealing at different temperatures for 3 min(a) 650 ℃ (b) 750 ℃ (c) 850 ℃ (d) 950 ℃

Fig.8 OM images of microstructures in HAZ 1 after annealing at different temperatures for 3 min(a) 650 ℃ (b) 750 ℃ (c) 850 ℃ (d) 950 ℃

Fig.9 OM images of microstructures in HAZ 2 after annealing at different temperatures for 3 min(a) 650 ℃ (b) 750 ℃ (c) 850 ℃ (d) 950 ℃

Fig.10 OM images of microstructures in base metal after annealing at different temperatures for 3 min(a) 650 ℃ (b) 750 ℃ (c) 850 ℃ (d) 950 ℃

Fig.11 Microhardness distribution from weld zone to base metal after annealing at different temperatures for 3 min

Fig.12 The tensile strength and elongation of welded joint after annealing at different temperatures for 3 min

Fig.13 SEM images of tensile fracture surfaces of welded joint after annealing at different temperatures for 3 min(a) 650 ℃ (b) 750 ℃ (c) 850 ℃ (d) 950 ℃

Fig.14 Charpy impact energy of welded joint after annealing at different temperatures for 3 min

Fig.15 SEM images of impact fracture surfaces of welded joint after annealing at different temperatures for 3 min(a) 650 ℃ (b) 750 ℃ (c) 850 ℃ (d) 950 ℃

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