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水下激光重熔处理后水下激光熔覆双相不锈钢涂层的微观结构与耐腐蚀性

Microstructure and Corrosion Resistance of Underwater Laser Cladded Duplex Stainless Steel Coating after Underwater Laser Remelting Processing.

作者信息

Li Congwei, Zhu Jialei, Cai Zhihai, Mei Le, Jiao Xiangdong, Du Xian, Wang Kai

机构信息

College of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China.

National Engineering Research Center for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China.

出版信息

Materials (Basel). 2021 Aug 31;14(17):4965. doi: 10.3390/ma14174965.

DOI:10.3390/ma14174965
PMID:34501063
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8434108/
Abstract

Combined with the technologies of underwater local dry laser cladding (ULDLC) and underwater local dry laser remelting (ULDLR), a duplex stainless steel (DSS) coating has been made in an underwater environment. The phase composition, microstructure, chemical components and electrochemical corrosion resistance was studied. The results show that after underwater laser remelting, the phase composition of DSS coating remains unchanged and the phase transformation from Widmanstätten austenite + intragranular austenite + (211) ferrite to (110) ferrite occurred. The ULDLR process can improve the corrosion resistance of the underwater local dry laser cladded coating. The corrosion resistance of remelted coating at 3 kW is the best, the corrosion resistance of remelted coating at 1kW and 5kW is similar and the corrosion resistance of (110) ferrite phase is better than grain boundary austenite phase. The ULDLC + ULDLR process can meet the requirements of efficient underwater maintenance, forming quality control and corrosion resistance. It can also be used to repair the surface of S32101 duplex stainless steel in underwater environment.

摘要

结合水下局部干法激光熔覆（ULDLC）和水下局部干法激光重熔（ULDLR）技术，在水下环境中制备了双相不锈钢（DSS）涂层。研究了涂层的相组成、微观结构、化学成分和电化学耐蚀性。结果表明，水下激光重熔后，DSS涂层的相组成保持不变，发生了从魏氏奥氏体+晶内奥氏体+（211）铁素体到（110）铁素体的相变。ULDLR工艺可以提高水下局部干法激光熔覆涂层的耐蚀性。3kW重熔涂层的耐蚀性最佳，1kW和5kW重熔涂层的耐蚀性相似，（110）铁素体相的耐蚀性优于晶界奥氏体相。ULDLC+ULDLR工艺能够满足水下高效维修、成型质量控制和耐蚀性的要求。它还可用于水下环境中S32101双相不锈钢表面的修复。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6f30/8434108/e71b0e7c1bc8/materials-14-04965-g012.jpg
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