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 steelAbstractA 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.© the authors, CC-BY-NC 4.0

本数据集包含所收集的背散射电子图像及其由图像生成的粒子尺寸数据。这些数据在题为《焊接后热处理对MARBN钢焊缝匹配SMAW填充金属微观结构和性能影响》的期刊文章中进行了讨论。本研究对用于焊接MARBN钢的匹配成分填充金属进行了详细研究，以探究焊接工艺和焊接后热处理（PWHT）对焊缝金属和MARBN钢焊缝性能的影响。填充金属以屏蔽金属弧焊（SMAW）电极的形式存在。通过应用不同的层间温度和PWHT工艺，对全焊缝金属沉积物和焊接MARBN合金接头的微观结构和机械性能，尤其是韧性进行了考察。对微观结构（晶粒结构、析出物等）的差异进行了评估，以更好地理解焊接后热处理如何影响匹配焊缝金属及焊接MARBN钢接头的服役前起始条件。目前的工作发现，对于30毫米厚的全焊缝金属试样，经过735°C x 8小时的PWHT后，可达到合理的冲击韧性；更长的热处理时间（16小时和36小时）并未进一步增加韧性。对于更厚的铸块，需要735°C x 16小时的热处理才能获得与基体相当的焊缝韧性，因此被认为更适合实际工程应用。在735°C x 8小时后观察到均匀分布的莱维斯相析出；随着PWHT时间的延长，析出物的尺寸和面积分数逐渐增加，并在接近36小时时似乎趋于稳定。不同焊缝区域的析出物存在差异。与下焊区相比，焊帽区域的莱维斯析出物密度较低。从当前的研究中，还确定了进一步研究的方面。© 作者，CC-BY-NC 4.0