Mechanical Properties and Cooperation Mechanism of Corroded Steel Plates Retrofitted by Laser Cladding Additive Manufacturing Under Tension

Materials Pub Date : 2024-07-25 DOI:10.3390/ma17153690

Lan Kang, Peng Song, Xinpei Liu, Haizhou Chen

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Abstract

As a metal additive manufacturing process, laser cladding (LC) is employed as a novel and beneficial repair technology for damaged steel structures. This study employed LC technology with 316 L stainless steel powder to repair locally corroded steel plates. The influences of interface slope and scanning pattern on the mechanical properties of repaired specimens were investigated through tensile tests and finite element analysis. By comparing the tensile properties of the repaired specimens with those of the intact and corroded specimens, the effectiveness of LC repair technology was assessed. An analysis of strain variations in the LC sheet and substrate during the load was carried out to obtain the cooperation mechanism between the LC sheet and substrate. The experimental results showed that the decrease in interface slope slightly improved the mechanical properties of repaired specimens. The repaired specimens have similar yield strength and ultimate strength to the intact specimens and better ductility as compared to the corroded specimen. The stress–strain curve of repaired specimens can be divided into four stages: elastic stage, substrate yield-LC sheet elastic stage, substrate hardening-LC sheet elastic stage, and plastic stage. These findings suggest that the LC technology with 316 L stainless steel powder is effective in repairing damaged steel plates in civil engineering structures and that an interface slope of 1:2.5 with the transverse scanning pattern is suitable for the repair process.

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利用激光熔覆快速成型技术改造的腐蚀钢板在拉伸条件下的力学性能与合作机制

作为一种金属添加剂制造工艺，激光熔覆（LC）是一种新颖且有益的受损钢结构修复技术。本研究采用 LC 技术与 316 L 不锈钢粉末一起修复局部腐蚀的钢板。通过拉伸试验和有限元分析，研究了界面坡度和扫描模式对修复试样机械性能的影响。通过比较修复试样与完整试样和腐蚀试样的拉伸性能，评估了 LC 修复技术的有效性。通过分析负载过程中 LC 板和基体的应变变化，了解 LC 板和基体之间的合作机制。实验结果表明，界面坡度的减小可略微改善修复试样的机械性能。与完整试样相比，修复试样具有相似的屈服强度和极限强度，与腐蚀试样相比，修复试样具有更好的延展性。修复试样的应力-应变曲线可分为四个阶段：弹性阶段、基体屈服-LC 片弹性阶段、基体硬化-LC 片弹性阶段和塑性阶段。这些研究结果表明，使用 316 L 不锈钢粉末的 LC 技术可有效修复土木工程结构中的受损钢板，而且 1:2.5 的界面坡度和横向扫描模式适合于修复过程。

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Materials

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