Reconstruction Mechanism of Surface Integrity for Laser Additive Manufactured 316 L Stainless Steel Subjected to Ultrasonic Surface Rolling Process: Numerical Simulation and Experimental Verification

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals and Materials International Pub Date : 2024-05-18 DOI:10.1007/s12540-024-01683-z

Qingzhong Xu, Xiao Yang, Junjie Liu, Zhihao Qiu, Gen Li

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Abstract

The ultrasonic surface rolling process (USRP) is a strengthening process to improve the surface properties and enhance the mechanical performances of metal materials based on severe plastic deformation and high strain rates. In this study, a three-dimensional numerical model was established to investigate the reconstruction mechanism of surface integrity for the laser additive manufactured 316 L stainless steel (LAMed 316 L) subjected to USRP. The accuracy of the USRP model was confirmed by experimental results of residual stress, microhardness, and surface roughness. The results showed that the static pressure played a crucial role in causing the plastic deformation and strain hardening, followed by the decreased surface roughness, improved microhardness, and induced compressive residual stresses. The introduction of ultrasonic high-frequency impact with the smaller force contributed to the high strain rate plastic deformation and the surface tensile stress release, and improved the plastic deformation efficiency greatly. The reconstructed surface integrity of LAMed 316 L was attributed to the plastic strain, strain hardening, and grain refinement.

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受超声波表面滚压工艺影响的激光增材制造 316 L 不锈钢表面完整性的重构机制：数值模拟与实验验证

超声波表面滚压工艺（USRP）是一种基于剧烈塑性变形和高应变率的强化工艺，可改善金属材料的表面性能并提高其机械性能。本研究建立了一个三维数值模型，以研究激光增材制造的 316 L 不锈钢（LAMed 316 L）在 USRP 作用下表面完整性的重建机制。残余应力、显微硬度和表面粗糙度的实验结果证实了 USRP 模型的准确性。结果表明，静态压力在引起塑性变形和应变硬化方面起着关键作用，其次是表面粗糙度降低、显微硬度提高和压残余应力诱发。引入较小作用力的超声高频冲击有助于高应变率塑性变形和表面拉应力释放，大大提高了塑性变形效率。LAMed 316 L 重构后的表面完整性归因于塑性应变、应变硬化和晶粒细化。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.