Exploring the post-heat treatment on the electropolishing characteristics of laser powder bed fusion processed Inconel 718 superalloy

IF 2.3 4区工程技术 Q2 ENGINEERING, MECHANICAL

Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering Pub Date : 2024-07-25 DOI:10.1177/09544089241263144

Abhishek Shrivastava, S Anand Kumar, Samrat Rao

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Abstract

The influence of post-heat treatment on the microstructural and electropolishing characteristics of the laser powder bed fusion processed Inconel 718 is studied. The electropolishing results show a significant decrease in the surface roughness for as-printed (∼69%) and post-heat treatment conditions (∼74%) with increasing current density and polishing time. The surface morphology of the as-printed samples showed the presence of unaltered asperities on the electropolished surface, which can be attributed to the precipitation of non-conductive lave phases and metal carbides during laser powder bed fusion processing. The post-heat treatment homogenizes microstructure and dissolves these phases in the metal matrix along with the precipitation of strengthening phases. As a result, the surface morphology of post-heat treatment samples becomes more uniform, signifying fewer surface irregularities. The statistical parameters show a significant reduction in sharp asperities in the post-heat treatment condition. The material ratio curves revealed uniform material distribution in the post-heat treatment samples, signifying reduced surface asperities compared to as-printed conditions.

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探索后热处理对激光粉末床熔融加工 Inconel 718 超耐热合金电抛光特性的影响

研究了后热处理对激光粉末床熔融加工 Inconel 718 的微观结构和电抛光特性的影响。电抛光结果表明，随着电流密度和抛光时间的增加，原压印（∼69%）和后热处理条件下（∼74%）的表面粗糙度显著降低。表面形貌显示，在电抛光表面上存在未改变的毛刺，这可能是由于在激光粉末床熔融加工过程中析出了不导电的石墨相和金属碳化物。后热处理使微观结构均匀化，并将这些相溶解在金属基体中，同时析出强化相。因此，后热处理样品的表面形态变得更加均匀，表面不规则现象减少。统计参数显示，在后热处理条件下，尖锐的锯齿明显减少。材料比率曲线显示，热处理后样品中的材料分布均匀，这表明与印刷状态相比，表面尖角减少了。

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来源期刊

Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 工程技术-工程：机械

CiteScore

3.80

自引率

16.70%

发文量

370

审稿时长

6 months

期刊介绍： The Journal of Process Mechanical Engineering publishes high-quality, peer-reviewed papers covering a broad area of mechanical engineering activities associated with the design and operation of process equipment.