Data for particle analysis in "Effects of post weld heat treatment on the microstructure and properties of the matching SMAW filler metal for weld joints in MARBN steel"

Data set consisting of collected backscattered electron images together with the particle size data produced from the images.

These data are discussed in the journal article with the title: Effects of post weld heat treatment on the microstructure and properties of the matching SMAW filler metal for weld joints in MARBN steel

Abstract

A detailed investigation has been carried out of the matching composition filler metal for welding MARBN steel to explore the influence of welding procedure and post weld heat treatment (PWHT) on the microstructure and properties of the weld metal and a MARBN steel weld joint. The filler metal was in the form of a shielded metal arc welding (SMAW) electrode. With different inter-pass temperatures and PWHT procedures applied, the microstructure and mechanical properties, particularly toughness, of the all-weld metal deposits and welded MARBN alloy joints were examined. The differences in microstructure (grain structure, precipitates, etc.) were evaluated to provide a better understanding of how the PWHTs influence the starting conditions of the matching weld metal and welded MARBN steel joints before service.

Current work found that, for a 30 mm thick all-weld metal coupon, reasonable impact toughness was achieved after PWHT of 735°C x 8h; longer heat treatment durations (16 h and 36 h) did not further increase the toughness. For thicker cast blocks, a PWHT of 735°C x 16h was needed for weld toughness comparable to the base metal, hence was considered more appropriate for actual engineering applications. Evenly distributed Laves phase precipitation was observed after 735°C x 8h; the precipitates gradually increased in size and area fraction as the duration of PWHT increased, and appeared to be stable when approaching 36 h. Differences in the precipitation were observed between different weld regions. The weld cap region had a lower density of Laves precipitates compared to the lower weld area. From the current investigation, aspects for further investigation are also identified.

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