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Research Papers: Materials and Fabrication

Residual Stress Distribution in Hard-Facing of Pressure Relief Valve Seat

[+] Author and Article Information
Li Ai, Xinhai Yu

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

Wenchun Jiang

College of Chemical Engineering,
China University of Petroleum,
Qingdao 266555, China

Wanchuck Woo

Neutron Science Division,
Korea Atomic Energy Research Institute,
Daejeon 305-353, South Korea

Xiaofeng Ze

Wujiang Dongwu Machinery Co., Ltd.,
Jiangsu 215213, China

Shan-Tung Tu

Key Laboratory of Pressure Systems
and Safety (MOE),
School of Mechanical and Power Engineering,
East China University of Science
and Technology,
Shanghai 200237, China
e-mail: sttu@ecust.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 29, 2013; final manuscript received January 28, 2014; published online September 4, 2014. Assoc. Editor: Maher Y. A. Younan.

J. Pressure Vessel Technol 136(6), 061403 (Sep 04, 2014) (10 pages) Paper No: PVT-13-1024; doi: 10.1115/1.4026977 History: Received January 29, 2013; Revised January 28, 2014

In this study, for the hard-facing of spring-loaded pressure relief valve seats, the residual stress distributions after the tungsten inert gas welding, (TIG) postwelded heat treatment and subsequent surface turning were investigated. The heat input parameters of welding were calibrated using an infrared imaging and thermocouples. The residual stress distributions were computed using three-dimensional finite element model. The neutron diffraction approach was employed to verify the finite element calculation. It is found that, the surface temperature during hard-facing welding shows a double ellipsoidal shape with the highest value of around 1570 °C. The high residual stress zones are located exactly under the welded joint except a slight deviation in the hoop direction. The magnitudes of tensile residual stresses in the three directions increase with their corresponding locations from the root of the joint into the base metal. The residual stresses in all of the three directions decrease significantly after the heat treatment. After surface turning, the residual stresses are tensile except for those close to the inner surface that are compressive in axial and radial directions.

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Figures

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Fig. 1

(a) Welding direction and thermocouples arrangement, (b) the geometry dimensions of No. 1 sample, and (c) the geometry dimensions of No. 2 sample (A and B are regions that needs material removal between the two samples)

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Fig. 2

Locations of measurement points for residual stresses

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Fig. 3

Thermal physical and mechanical properties as functions of temperature for parental and filler materials

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Fig. 4

Finite element models for simulation: (a) welding and (b) after surface turning

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Fig. 5

Thermal history of the ambient temperature in a furnace for the heat treatment

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Fig. 6

The comparison of (a) the infrared image and (b) visible picture during hard-facing welding

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Fig. 7

The comparison of (a) the infrared image and (b) modeling temperature contour

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Fig. 8

Temperature changes during hard-facing welding by measurements using thermocouples and simulation

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Fig. 9

Residual stress distribution of as-welded sample (No. 1) in the (a) hoop, (b) axial, and (c) radial directions by simulation and measurements

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Fig. 10

Residual stress distributions of as-welded sample and after subsequent heat treatment in three directions

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Fig. 11

Residual stresses for three directions after PWHT by simulation

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Fig. 12

Residual stress distribution of sample after surface turning (No. 2) in the (a) hoop, (b) axial, and (c) radial directions by simulation and measurements

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