Microstructure and properties of underwater in-situ wire-based laser additive manufactured duplex stainless steel

IF 12.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

ACS Central Science Pub Date : 2024-12-31 DOI:10.1080/17452759.2024.2401925

Congwei Li, Jialei Zhu, Caimei Wang, Caiyan Deng, Lei Cui, Xiaochun Zhang, Chenglu Zhao, Xiangdong Jiao

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引用次数: 0

Abstract

A novel underwater in-situ wire-based laser additive manufacturing (ULAM) technology is proposed for the in-service repair of underwater components in nuclear power plant. Duplex stainless steel (DSS) obtained in air and underwater environments were analysed using material characterisation and testing methods. The effects of underwater additive environments on the microstructure evolution, mechanical properties and corrosion resistance of the specimens were investigated. The results show that the laser heat input is consumed to balance the heat loss of the water-cooled base material during the underwater laser additive manufacturing process, leading to a reduction in the heat input to the molten pool. Underwater specimen exhibit a two-phase balance, with small ferrite grain boundary angles, resulting in better tensile strength and corrosion resistance. Laser reheat treatment leads to a phase change in microstructure, which can enhance the microhardness and the tensile strength. The ULAM system can meet the requirements of actual engineering for cladding layer.

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水下原位线材激光增材制造双相不锈钢的微观结构和性能

针对核电站水下部件的在役维修，提出了一种新型水下原位线基激光增材制造（ULAM）技术。使用材料表征和测试方法分析了在空气和水下环境中获得的双相不锈钢（DSS）。研究了水下添加剂环境对试样微观结构演变、机械性能和耐腐蚀性能的影响。结果表明，在水下激光增材制造过程中，激光输入的热量被消耗以平衡水冷母材的热量损失，从而导致熔池输入的热量减少。水下试样表现出两相平衡，铁素体晶界角小，因此抗拉强度和耐腐蚀性更好。激光再热处理会导致微观结构发生相变，从而提高显微硬度和抗拉强度。ULAM 系统可满足实际工程对覆层的要求。

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来源期刊

ACS Central Science Chemical Engineering-General Chemical Engineering

CiteScore

25.50

自引率

0.50%

发文量

194

审稿时长

10 weeks

期刊介绍： ACS Central Science publishes significant primary reports on research in chemistry and allied fields where chemical approaches are pivotal. As the first fully open-access journal by the American Chemical Society, it covers compelling and important contributions to the broad chemistry and scientific community. "Central science," a term popularized nearly 40 years ago, emphasizes chemistry's central role in connecting physical and life sciences, and fundamental sciences with applied disciplines like medicine and engineering. The journal focuses on exceptional quality articles, addressing advances in fundamental chemistry and interdisciplinary research.