Effect of annealing and strain rate on the microstructure and mechanical properties of austenitic stainless steel 316L manufactured by selective laser melting

IF 3.8 2区工程技术 Q2 ENGINEERING, MANUFACTURING

Advances in Manufacturing Pub Date : 2024-11-12 DOI:10.1007/s40436-024-00528-7

Zhi-Ping Zhou, Zhi-Heng Tan, Jin-Long Lv, Shu-Ye Zhang, Di Liu

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Abstract

New insights are proposed regarding the α′-martensite transformation and strengthening mechanisms of austenitic stainless steel 316L fabricated using selective laser melting (SLM-ed 316L SS). This study investigates the effects of annealing on the microstructural evolution, mechanical properties, and corrosion resistance of SLM-ed 316L SS specimens. The exceptional ultimate tensile strength (807 MPa) and good elongation (24.6%) of SLM-ed 316L SS was achieved by SLM process and annealing treatment at 900 °C for 1 h, which was attributed to effective dislocation strengthening and grain boundary strengthening. During tensile deformation, annealed samples exhibited deformation twinning as a result of the migration from high-angle grain boundaries to low-angle grain boundaries, facilitating the α′-martensite transformation. Consequently, a deformation mechanism model is proposed. The contribution of dislocation strengthening (~61.4%) is the most important strengthening factor for SLM-ed 316L SS annealed 900 °C for 1 h, followed by grain boundary strengthening and solid solution strengthening. Furthermore, the corrosion resistance of SLM-ed 316L SS after annealing treatment is poor due to its limited re-passivation ability.

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退火和应变速率对选择性激光熔化316L奥氏体不锈钢显微组织和力学性能的影响

对选择性激光熔制316L奥氏体不锈钢（SLM-ed 316L SS）的α′-马氏体相变和强化机理提出了新的见解。研究了退火对SLM-ed 316L SS试样组织演变、力学性能和耐蚀性的影响。通过SLM工艺和900℃退火1 h，获得了优异的极限抗拉强度（807 MPa）和良好的延伸率（24.6%），这是位错强化和晶界强化的结果。在拉伸变形过程中，退火后的试样由于从高角晶界向低角晶界的迁移而出现变形孪晶，促进了α′-马氏体转变。据此，提出了一种变形机理模型。对于SLM-ed 316L SS， 900℃退火1 h，位错强化的贡献最大（~61.4%），其次是晶界强化和固溶体强化。此外，由于再钝化能力有限，退火处理后的SLM-ed 316L SS的耐腐蚀性较差。

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来源期刊

Advances in Manufacturing Materials Science-Polymers and Plastics

CiteScore

9.10

自引率

3.80%

发文量

274

期刊介绍： As an innovative, fundamental and scientific journal, Advances in Manufacturing aims to describe the latest regional and global research results and forefront developments in advanced manufacturing field. As such, it serves as an international platform for academic exchange between experts, scholars and researchers in this field. All articles in Advances in Manufacturing are peer reviewed. Respected scholars from the fields of advanced manufacturing fields will be invited to write some comments. We also encourage and give priority to research papers that have made major breakthroughs or innovations in the fundamental theory. The targeted fields include: manufacturing automation, mechatronics and robotics, precision manufacturing and control, micro-nano-manufacturing, green manufacturing, design in manufacturing, metallic and nonmetallic materials in manufacturing, metallurgical process, etc. The forms of articles include (but not limited to): academic articles, research reports, and general reviews.