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Research Papers: Materials and Fabrication

Effect of Weld Cooling Rates on Mechanical and Metallurgical Properties of Submerged Arc Welded Pressure Vessel Steel

[+] Author and Article Information
Harish Kumar Arya

Department of Mechanical Engineering,
Sant Longowal Institute of
Engineering & Technology,
Longowal (Sangrur),
Punjab 148106, India
e-mail: arya.iitr@gmail.com

Kulwant Singh

Professor
Department of Mechanical Engineering,
Sant Longowal Institute of
Engineering & Technology,
Longowal (Sangrur),
Punjab 148106, India
e-mail: engrkulwant@yahoo.co.in

R. K. Saxena

Professor
Department of Mechanical Engineering,
Sant Longowal Institute of
Engineering & Technology,
Longowal (Sangrur),
Punjab 148106, India
e-mail: rksaxena.04@gmail.com

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received November 24, 2017; final manuscript received May 8, 2018; published online June 18, 2018. Assoc. Editor: San Iyer.

J. Pressure Vessel Technol 140(4), 041406 (Jun 18, 2018) (7 pages) Paper No: PVT-17-1239; doi: 10.1115/1.4040274 History: Received November 24, 2017; Revised May 08, 2018

Submerged arc welding of SA 516 grade 60 pressure vessel grade steel was conducted with different heat plate thicknesses and the influence of cooling rate on microstructure, Vickers hardness, and impact toughness of heat affected zone (HAZ) of weldment was systematically investigated. Weld cooling rates vary with change in heat input or variation in plate thickness of base metal. Results showed that thin plates accumulate the heat, which cause grain coarsening and loss of acicular ferrite (AF) microstructure, which is further responsible for lower impact strength of welded joint. It is deemed that faster cooling rates due to heat sink in thickness direction with thick plates cause high percentage of AF with finer grain and enhanced hardness values. Improved impact strength with thick plates with same heat input signifies that supplying heat more than required to thin plates may cause microstructural deterioration and responsible for impact strength loss of weldments. Test demonstrates that the cooling rate should be above 15 °C/s to keep impact strength loss within considerable limits.

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References

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Figures

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Fig. 1

(a) Submerged arc welding machine, (b) data acquisition system for temperature measurement, and (c) fixture for thermocouple positioning

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Fig. 2

(a) Vickers's microhardness testing setup and (b) optical view of indentation (10x)

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Fig. 3

(a) Charpy impact test specimen as per ASTM E 23 (all dimensions in mm) and (b) line of hardness measurement and position of V notch in the Charpy specimen in cross section of welded joint

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Fig. 4

Time temperature plot at 1.9 KJ/mm heat input

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Fig. 5

Time temperature plot of 10 mm thick SA 516 grade 60 weldment

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Fig. 6

Optical micrograph of SA 516 grade 60 (base metal): (a) at 100× and (b) at 1000×

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Fig. 7

Optical micrograph of 10 mm (thin plate) weldment at 1.9 KJ/mm

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Fig. 8

Optical micrograph of 16 mm (thick plate) weldment at 1.9 KJ/mm

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Fig. 9

Optical micrograph of weld zone of 10 mm (thin plate) weldment at 1.9 KJ/mm

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Fig. 10

Optical micrograph of weld zone of 16 mm (thin plate) weldment at 1.9 KJ/mm

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Fig. 11

Effect of heat input on microhardness for 10 mm weldment

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Fig. 12

Microhardness of weldments at 1.9 KJ/mm heat input

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Fig. 13

Charpy impact curves for SA 516 welds at 1.9 KJ/mm heat input

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Fig. 14

SEM images of toughness test fractured surfaces of weld joint of 10 mm (thin plate) at 1.9 KJ/mm

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Fig. 15

SEM image of toughness test fractured surfaces of weld joint of 16 mm (thick plate) at 1.9 KJ/mm

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