Effect of Heat Input on Dynamic Tensile Deformation Behavior of Q550 Steel

doi:10.11901/1005.3093.2016.137

Chinese Journal of Materials Research

2016, Vol. 30

Issue (11): 811-818 DOI: 10.11901/1005.3093.2016.137

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Effect of Heat Input on Dynamic Tensile Deformation Behavior of Q550 Steel

Xiaotong GUO,Lei WANG(

),Chenglei QIN,Xu YUAN

Key Lab for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110819, China

Cite this article:

Xiaotong GUO, Lei WANG, Chenglei QIN, Xu YUAN. Effect of Heat Input on Dynamic Tensile Deformation Behavior of Q550 Steel. Chinese Journal of Materials Research, 2016, 30(11): 811-818.

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Abstract

Q550 steel was welded by shielded metal arc welding with varying heat inputs, and then the microstructure of the weld joint was characterized, while the effect of strain rate on its mechanical behavior were examined. The results show that when the heat input below 18 kJ/cm, with the increasing heat input, acicular ferrite content of the fusion zone and the grain size of the heat affected zone increased. With the increasing strain rate, the elongation and tensile strength of the welded joint increased to different extents. With the increasing heat input, the depth of large dimples increased, while the area of small dimples decreased in the fractured surface. During high speed tension, the resistance to dislocation slip increased, however the propagating rate of dislocation slip far behind the increasing speed of load, which led to increase in yield strength and tensile strength with the increase of strain rate. With the increasing heat input, acicular ferrite content of fusion zone increased, which is the main reason for the increase of sensitivity of tensile property to strain rate.

Key words: metalic materials low alloy high strength steel shielded metal arc welding heat input strain rate deformationbehavior

Received: 14 March 2016

Fund: *Supported by National Training Program of Innovation and Entrepreneurship for Undergraduates No. 201510145041.

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.137 OR https://www.cjmr.org/EN/Y2016/V30/I11/811

Table 1 Chemical compositions of Q550 steel (mass fraction, %)

Table2 Chemical compositions and mechanical behavior of SMAW welding material's deposited metal

Table 3 SMAW Heat Input’s Parameters

Fig.1 Size and sampling ways of tensile specimen (unit=mm)

Fig.2 Microstructure of Q550 steel

Fig.3 Microstructure of fusion zone in low heat input (fig. b, c and d are the microstructure of I, II and III) (a) surfacing layer of fusion zone, (b) microstructure of fusion zone, (c) trace of columnar rain-growth of fu sion zone, (d) grain refinement of fusion zone

Fig.4 Microstructure of heat affected zone in low heat input (a) coarse grained region, (b) fine grained region, (c) partial normalized zone

Fig.5 Microstructure of welded joint in different heat input (a) fusion zone in low heat input, (b) fusion zone in high heat input, (c) coarse grained region of heat affected zone in low heat input, (d) coarse grained region of heat affected zone in high heat input

Fig.6 Hardness distribution of welded joint

Fig.7 ynamic tensile stress strain curve and properties of Q550 steel

Fig.8 Dynamic tensile strength and ductility in different strain rate

Fig.9 Tensile stress strain curvesof welded joint for different heat input conditions with the strain rate of 10² s^-1

Fig.10 Dynamic tensile strength and ductility under different heat input conditions (a) dynamic tensile strength, (b) ductility

Fig.11 SEM morphologies tensile fracture fiber zone of welded joint (heat input 15 kJ/cm) (a) 10^-3 s^-1, (b) 10¹ s^-1, (c) 10² s^-1, (d) 5×10² s^-1

Fig.12 SEM morphologies tensile fracture fiber zone of welded joint (heat input 18 kJ/cm) (a) 10^-3 s^-1, (b) 10¹ s^-1, (c) 10² s^-1, (d) 5×10² s^-1

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