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Research Papers: Materials and Fabrication

Evaluation of Through-Thickness Residual Stresses by Neutron Diffraction and Finite-Element Method in Thick Weld Plates

[+] Author and Article Information
Wenchun Jiang

Neutron Science Division,
Korea Atomic Energy Research Institute,
1045 Daedeok-daero,
Yuseong-gu,
Daejeon 305-353, South Korea;
State Key Laboratory of Heavy Oil Processing,
College of Chemical Engineering,
China University of Petroleum (East China),
Qingdao 266580, China
e-mail: jiangwenchun@126.com

Wanchuck Woo

Neutron Science Division,
Korea Atomic Energy Research Institute,
1045 Daedeok-daero,
Yuseong-gu,
Daejeon 305-353, South Korea
e-mail: chuckwoo@kaeri.re.kr

Yu Wan, Yun Luo, Xuefang Xie

State Key Laboratory of Heavy Oil Processing,
College of Chemical Engineering,
China University of Petroleum (East China),
Qingdao 266580, China

S. T. Tu

Key Laboratory of Pressure System
and Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science
and Technology,
Shanghai 200237, China

1Corresponding authors.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received March 14, 2016; final manuscript received August 29, 2016; published online October 11, 2016. Assoc. Editor: Xian-Kui Zhu.

J. Pressure Vessel Technol 139(3), 031401 (Oct 11, 2016) (10 pages) Paper No: PVT-16-1043; doi: 10.1115/1.4034676 History: Received March 14, 2016; Revised August 29, 2016

Through-thickness distributions of the welding residual stresses were studied in the range of 50–100 mm thick plates by using finite-element modeling (FEM) and neutron diffraction measurements. In order to simulate the residual stresses through the thickness of the thick weld joints, this paper proposes a two-dimensional generalized plane strain (GPS) finite-element model coupled with the mixed work hardening model. The residual stress distributions show mostly asymmetric parabola profiles through the thickness of the welds and it is in good correlation with the neutron diffraction results. Both the heat input and plate thickness have little influence on the residual stress distributions due to the relatively large constraints of the thick specimen applied for each welding pass. A general formula has been suggested to evaluate the distributions of the through-thickness residual stresses in thick welds based on FEM and neutron diffraction experimental results.

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References

Figures

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Fig. 1

The schematic of 80-mm thick weld plate

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Fig. 2

Tensile test curve for weld (a) and base metals (b)

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Fig. 3

Finite-element meshing

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Fig. 4

Ramp heat-input model

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Fig. 5

Microstructure of weld metal (a), HAZ (b), and base metal (c)

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Fig. 6

The mixed working hardening model

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Fig. 7

The as-fabricated residual stress through-thickness of base metal

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Fig. 8

Contours of longitudinal (LD), transverse (TD), and normal (TD) residual stresses

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Fig. 9

Residual stress distribution along path P1

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Fig. 10

Residual stress distribution along path P2

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Fig. 11

Variation of residual stress as a function of welding layers at the bottom of weld root

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Fig. 12

Residual stress distribution along path P3

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Fig. 13

Effect of heat input on residual stress along path P1

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Fig. 14

Effect of heat input on residual stress along path P4

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Fig. 15

Effect of plate thickness on residual stress along path P1

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