Czupryński Artur, Wyględacz Bernard
Department of Welding Engineering, Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland.
Materials (Basel). 2020 May 21;13(10):2367. doi: 10.3390/ma13102367.
In this article, the results of surfacing technology development, and structural, and mechanical properties examinations of 16Mo3 steel pipes with an outside coating of Inconel 625 deposited by automated plasma powder transferred arc (PPTA) and automated high power direct diode laser (HPDDL) surfacing were presented. Based on the results of non-destructive, metallographical macro- and microscopic, chemical composition, and thickness and hardness examinations optimal technology for use in high temperature energy or chemical industry applications was selected. The examinations conducted for each of the aforementioned technologies revealed the proper structure and high quality of coating. Dendritic structure with primary crystals growing in the direction of heat dissipation was revealed. No defects such as cracks, lack of fusion or porosity were found. Iron content in the most outer area of the layer made by PPTA with a heat input of 277-514 J/mm, thickness from 1.2 to 1.7 mm, between 4% and 5.5% was observed. Iron content in the most outer area of the layer made by HPDDL surfacing with output power of 1000-1600 W and scanning speed 3.3-4.7mm/s, from 0.6 to 1.3 mm in thickness, between 5.1% and 7.5% was observed. In coated pipes made by either technology high quality of surfaced layers, conforming to requirements posed on protective layers manufactured for prolonged exploitation in temperatures up to 625 °C, were observed. High temperature resistance examinations are the focus of further, yet unpublished, research. The obtained results point to slight differences in the parameters and properties of nickel-based superalloy layers surfaced on 16Mo3 pipes based on the technologies used. However, the process parameters optimization in the case of PPTA was simpler compared to HPDDL surfacing.
本文介绍了采用自动等离子粉末转移电弧（PPTA）和自动高功率直接二极管激光（HPDDL）堆焊工艺在16Mo3钢管外表面熔敷因科镍合金625的堆焊技术开发成果，以及对堆焊层的组织和力学性能进行的检测。基于无损检测、金相宏观和微观检测、化学成分分析以及厚度和硬度检测结果，选择了适用于高温能源或化工行业应用的最佳工艺。对上述每种工艺进行的检测均表明堆焊层具有合适的组织和高质量。检测发现了枝晶组织，初生晶体沿散热方向生长。未发现裂纹、未熔合或气孔等缺陷。观察到PPTA堆焊层最外层区域的铁含量在4%至5.5%之间，热输入为277 - 514 J/mm，厚度为1.2至1.7 mm。观察到HPDDL堆焊层最外层区域的铁含量在5.1%至7.5%之间，输出功率为1000 - 1600 W，扫描速度为3.3 - 4.7mm/s，厚度为0.6至1.3 mm。采用这两种工艺制造的涂层管道均具有高质量的堆焊层，符合在高达625℃的温度下长期使用的保护层的要求。高温抗性检测是进一步研究的重点，尚未发表。所得结果表明，基于所采用的工艺，在16Mo3钢管上堆焊的镍基高温合金层在参数和性能上存在细微差异。然而，与HPDDL堆焊相比，PPTA工艺的参数优化更为简单。
