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Research Papers: Materials and Fabrication

Mechanical Properties Variations and Comparative Analysis of Dissimilar Metal Pipe Welds in Pressure Vessel System of Nuclear Plants

[+] Author and Article Information
Dinesh W. Rathod

Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
Hauz Khas,
New Delhi 110016, India
e-mail: dineshvrathod@gmail.com

Sunil Pandey

Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
Hauz Khas,
New Delhi 110016, India
e-mail: spandey@mech.iitd.ernet.in

P. K. Singh

Reactor Safety Division,
Bhabha Atomic Research Centre,
Hall 7, Trombay,
Mumbai 400085, India
e-mail: pksingh@barc.gov.in

Rajesh Prasad

Department of Applied Mechanics,
Indian Institute of Technology Delhi,
Hauz Khas,
New Delhi 110016, India
e-mail: rajesh@am.iitd.ac.in

1Present address: Department of Mechanical Engineering, Manav Rachna International University, Sec-43, Faridabad 121001, Haryana, India.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 3, 2015; final manuscript received July 1, 2015; published online September 7, 2015. Assoc. Editor: Marina Ruggles-Wrenn.

J. Pressure Vessel Technol 138(1), 011403 (Sep 07, 2015) (9 pages) Paper No: PVT-15-1055; doi: 10.1115/1.4031129 History: Received April 03, 2015; Revised July 01, 2015

The experimental investigations of two dissimilar metal weld (DMW) joints between SA508Gr.3Cl.1 ferritic steel and SS304LN austenitic stainless steel using Inconel 82/182 (ERNiCr-3/ENiCrFe-3) and Inconel 52/152 (ERNiCrFe-7/ENiCrFe-7) filler metals have been conducted in the present work. The integrity assessment of DMW joints and the mechanical properties variations has made pertaining to ASME Section-III and Section-IX. Mechanical tests comprising bend test, transverse tensile test (TTT), tensile test, Charpy impact test, microhardness measurement have been carried out along with microstructural evolution using the standard test specimens according to respective ASTM standards. Bend tests have shown that interfaces of the SA508–Inconel, Inconel–Inconel, and Inconel–SS304LN are free from any lack of fusion or cracks. TTTs have shown that failures of the specimens are from the SS304LN indicating integrity of the weld joint. Tensile tests confirm that tensile strength of the different regions agreed the required strength as per ASME Section-II. The weld strength mismatch and plastic instability strength (PIS) are found to be important factors during integrity assessment of joints. Based on the comparative investigations, owing to better mechanical properties, Inconel 82/182 filler metals could be an optimum choice over Inconel 52/152 filler metals for present DMW joints required in pressure vessel system of nuclear plants.

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Figures

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Fig. 1

As-welded DMW pipe joints using (a) Inconel 82/182 and (b) Inconel 52/152 consumables

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Fig. 2

Schematic of TTT specimens, across the direction of weld

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Fig. 3

Schematic of Charpy specimens from HAZ of ferritic steel, buttering, weld metal, and the tensile specimens in the circumferential direction of welds

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Fig. 4

Side bend test specimens showing no cracks or defects: (a) Inconel 82/182 and (b) Inconel 52/152 joint

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Fig. 5

Stress–strain curves from TTT specimens for both DMW joints

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Fig. 6

TTT specimens after test: (a) Inconel 82/182 joint and (b) Inconel 52/152 joint

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Fig. 7

Interior of buttering with dendrites and dendrite cores of (a) Inconel 82 and (b) Inconel 52

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Fig. 8

Interior of weld metal with general grain structure of (a) Inconel 182 and (b) Inconel 152

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Fig. 9

HAZ of SS304LN representing (a) Inconel 82/182 and (b) Inconel 52/152 DMW joints

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Fig. 10

Microhardness variations across both the DMW pipe joints

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Fig. 11

Typical stress–strain curves of base metal and weldment regions of (a) Inconel 82/182 joint and (b) Inconel 52/152 joint

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Fig. 12

Average tensile properties of base metal and weldment regions of (a) Inconel 82/182 joint and (b) Inconel 52/152 joint

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Fig. 13

Fracture surface of tensile test specimens: (a) Inconel 82 and (b) Inconel 52 buttering

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Fig. 14

Fracture surface of tensile test specimens: (a) Inconel 182 and (b) Inconel 152 buttering

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Fig. 15

Impact toughness in base metals and weldment regions of both DMW joints

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