Effect of magnetic stirring on grain structure refinement: Part 2 - Nickel alloy weld overlays

Y. C. Lim; X. Yu; J. H. Cho; J. Sosa; D. F. Farson; S. S. Babu; S. McCracken; B. Flesner

doi:10.1179/136217110X12720264008231

Effect of magnetic stirring on grain structure refinement: Part 2 - Nickel alloy weld overlays

Y. C. Lim, X. Yu, J. H. Cho, J. Sosa, D. F. Farson, S. S. Babu, S. McCracken, B. Flesner

Research output: Contribution to journal › Article › peer-review

45 Citations (Scopus)

Abstract

The formation of a columnar grain structure in high chromium nickel based alloy welds can be associated with cracking and poor resolution for ultrasonic non-destructive examination. The objective of this research was to characterise the effects of circular magnetic arc deflection (arc stirring) on grain structure of gas tungsten arc weld overlays made on Inconel 690 substrates with 52M filler wire. Welds and weld overlays were made at various arc stirring frequencies, and microstructures were analysed using optical and electron backscattered diffraction microscopy. Significant refinement of grain size occurred at a stirring frequency of 7 Hz. Ultrasonic non-destructive examination confirmed 100% improvement in signal/noise ratio in weld overlays made with magnetic stirring.

Original language	English
Pages (from-to)	400-406
Number of pages	7
Journal	Science and Technology of Welding and Joining
Volume	15
Issue number	5
DOIs	https://doi.org/10.1179/136217110X12720264008231
Publication status	Published - 1 Jul 2010
Externally published	Yes

Keywords

GRAIN BOUNDARIES-GRAIN BOUNDARY STRUCTURE
GRAIN REFINING
JOINING-WELDING
MISORIENTATION
NON-DESTRUCTIVE TESTING
SIMULATION

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10.1179/136217110X12720264008231

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title = "Effect of magnetic stirring on grain structure refinement: Part 2 - Nickel alloy weld overlays",

abstract = "The formation of a columnar grain structure in high chromium nickel based alloy welds can be associated with cracking and poor resolution for ultrasonic non-destructive examination. The objective of this research was to characterise the effects of circular magnetic arc deflection (arc stirring) on grain structure of gas tungsten arc weld overlays made on Inconel 690 substrates with 52M filler wire. Welds and weld overlays were made at various arc stirring frequencies, and microstructures were analysed using optical and electron backscattered diffraction microscopy. Significant refinement of grain size occurred at a stirring frequency of 7 Hz. Ultrasonic non-destructive examination confirmed 100% improvement in signal/noise ratio in weld overlays made with magnetic stirring.",

keywords = "GRAIN BOUNDARIES-GRAIN BOUNDARY STRUCTURE, GRAIN REFINING, JOINING-WELDING, MISORIENTATION, NON-DESTRUCTIVE TESTING, SIMULATION",

author = "Lim, {Y. C.} and X. Yu and Cho, {J. H.} and J. Sosa and Farson, {D. F.} and Babu, {S. S.} and S. McCracken and B. Flesner",

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T1 - Effect of magnetic stirring on grain structure refinement

T2 - Part 2 - Nickel alloy weld overlays

AU - Lim, Y. C.

AU - Yu, X.

AU - Cho, J. H.

AU - Sosa, J.

AU - Farson, D. F.

AU - Babu, S. S.

AU - McCracken, S.

AU - Flesner, B.

PY - 2010/7/1

Y1 - 2010/7/1

N2 - The formation of a columnar grain structure in high chromium nickel based alloy welds can be associated with cracking and poor resolution for ultrasonic non-destructive examination. The objective of this research was to characterise the effects of circular magnetic arc deflection (arc stirring) on grain structure of gas tungsten arc weld overlays made on Inconel 690 substrates with 52M filler wire. Welds and weld overlays were made at various arc stirring frequencies, and microstructures were analysed using optical and electron backscattered diffraction microscopy. Significant refinement of grain size occurred at a stirring frequency of 7 Hz. Ultrasonic non-destructive examination confirmed 100% improvement in signal/noise ratio in weld overlays made with magnetic stirring.

AB - The formation of a columnar grain structure in high chromium nickel based alloy welds can be associated with cracking and poor resolution for ultrasonic non-destructive examination. The objective of this research was to characterise the effects of circular magnetic arc deflection (arc stirring) on grain structure of gas tungsten arc weld overlays made on Inconel 690 substrates with 52M filler wire. Welds and weld overlays were made at various arc stirring frequencies, and microstructures were analysed using optical and electron backscattered diffraction microscopy. Significant refinement of grain size occurred at a stirring frequency of 7 Hz. Ultrasonic non-destructive examination confirmed 100% improvement in signal/noise ratio in weld overlays made with magnetic stirring.

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KW - GRAIN REFINING

KW - JOINING-WELDING

KW - MISORIENTATION

KW - NON-DESTRUCTIVE TESTING

KW - SIMULATION

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ER -

Effect of magnetic stirring on grain structure refinement: Part 2 - Nickel alloy weld overlays

Abstract

Keywords

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