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Research Papers: Materials and Fabrication

Simulation and Analysis of Residual Stress and Microstructure Transformation for Post Weld Heat Treatment of a Welded Pipe

[+] Author and Article Information
Yi Han

National Engineering
Research Center for Equipment
and Technology of Cold Strip Rolling,
Yanshan University,
Qinhuangdao 066004, China;
The College of Mechanical Engineering,
Yanshan University,
Qinhuangdao 066004, China

Enlin Yu

National Engineering
Research Center for Equipment
and Technology of Cold Strip Rolling,
Yanshan University,
Qinhuangdao 066004, China;
The College of Mechanical Engineering,
Yanshan University,
Qinhuangdao 066004, China
e-mail: hanyi2008@vip.qq.com

Daochen Huang

The College of Mechanical Engineering,
Yanshan University,
Qinhuangdao 066004, China

Liang Zhang

College of Materials Science and Engineering,
Hebei University of Science and Technology,
Shijiazhuang 050018, China

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received February 8, 2013; final manuscript received September 16, 2013; published online January 7, 2014. Assoc. Editor: Xian-Kui Zhu.

J. Pressure Vessel Technol 136(2), 021401 (Jan 07, 2014) (8 pages) Paper No: PVT-13-1033; doi: 10.1115/1.4025942 History: Received February 08, 2013; Revised September 16, 2013

With the characteristics of the sandglass-shaped temperature field generated during welding of high-frequency induction longitudinally welded pipe taken into consideration, this paper focuses on the rules of influence of a post weld medium-frequency heat treatment process on microstructural change and the rules of residual stress distribution, and proposes a quantitative analysis method for studies on heating mechanisms of on-line heat treatment. The microstructural evolution process respect to time, and the rules of post weld axial, circumferential, radial, and residual von Mises stresses changing by path were quantitatively analyzed, respectively. It was found from comparison between a metallographic test and a microhardness test that on-line heat treatment is significantly effective in improving microstructures and reducing residual stress of the outer surface of a welded pipe. By controlling the distribution types of the microstructural field and the stress field through appropriate selection of heat treatment process parameters and distributing heat more reasonable heat distribution, it is expected that the residual stress of the inner surface of a welded pipe can be further reduced and the quality and efficiency of on-line heat treatment can be improved.

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References

Figures

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Fig. 1

The CCT diagram of the steel

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Fig. 2

Three-dimensional geometric model of the welded pipe (a) finite element model after meshing; (b) refined meshes

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Fig. 3

Layout of on-line heat treatment equipment in a production line

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Fig. 4

Computational flow chart of temperature field

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Fig. 10

Curves of residual stresses in various directions (a) axial residual stress curves; (b) axial residual stress curves of outer surface; (c) circumferential residual stress curves; (d) circumferential residual stress curves of outer surface; (e) radial residual stress curves; (f) Von Mises residual stress curves

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Fig. 9

Contour plots of residual stresses (a) contour plot of axial residual stress; (b) contour plot of circumferential residual stress; (c) contour plot of radial residual stress; (d) contour plot of Von Mises stress

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Fig. 11

Axial residual stress curves of outer surface and inner surface (a) axial residual stress curves of outer surface; (b) axial residual stress curves of inner surface

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Fig. 8

The metallurgical structures (a) point A; (b) point D; (c) base metal; (d) post weld point without heat treatment

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Fig. 7

Microstructure change curves of two nodes at a circumferential distance of 1 mm from weld seam center point (a) microstructure change curves at point A; (b) microstructure change curves at point D

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Fig. 6

Temperature curves at points on the outer surface at circumferential distances of 1 mm, 3 mm, and 12 mm, respectively, from weld seam center point (a) schematic of sampling points on the section of welded pipe; (b) temperature curves at point A; (c) temperature curves at points B and C

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Fig. 5

Temperature fields of the weld-seam section (a) temperature field of the section with the highest temperature point during high-frequency welding; (b) temperature field of the section after two medium-frequency heat treatment processes

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