Enhanced electrochemical corrosion resistance of 316L stainless steel manufactured by ultrasonic rolling assisted laser directed energy deposition

被引：0
作者：
Guan Liu [1 ]
Yigui Su [1 ]
Xuyu Pi [1 ]
Dongxu Wen [2 ]
Defu Liu [1 ]
Yongcheng Lin [1 ]
机构：
[1] School of Mechanical and Electrical Engineering, Central South University
[2] State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and
来源：
China Foundry | 2025年 / 22卷 / 02期
关键词：
D O I：
暂无
中图分类号：
TG142.71 [不锈钢、耐酸钢]; TG335 [轧制工艺]; TG665 [光能加工设备及其加工];
学科分类号：
摘要：
Under the laser directed energy deposition (LDED) process,the rapid melting and solidification usually lead to the emergence of pores and coarse columnar dendrites,which in turn compromise the properties of the deposited alloys.This study introduced in-situ ultrasonic rolling (UR) as an innovative method to enhance the corrosion resistance of LDED specimens,and the microstructural characteristics and their correlation with corrosion resistance were deeply investigated.The findings reveal that the LDED-UR specimen exhibits a reduction in both the fraction and size of pores.Under the influence of severe plastic deformation generated by LDED-UR process,fully equiaxed grains appear with a reduced average size of 28.61μm (compared to63.98μm for the LDED specimen with columnar grains).The electrochemical corrosion resistance of the LDED-UR specimen is significantly enhanced compared to the LDED specimen.This enhanced corrosion resistance can be attributed to the low fraction of small-sized pores,the fine and uniformly distributed Cr-enriched ferrite phase,and the formation of a compact and thick passive film due to dense grain boundaries.The insight of the correlation between microstructure and corrosion behavior opens up a new pathway to enhance the corrosion resistance of LDED specimens.
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页码：182 / 194
页数：13
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