Effect of Direct Ageing and Stress Relief Annealing on the Microstructure and Properties of Laser Selective Melting AlSi10Mg

IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Fuzhu Wang, Bin Chen, Zhiping Chen, Mengmeng Tong, Shiming Ren, Zhipeng Wang, Peng Xia, Jingbo Zhu, Runxia Li
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引用次数: 0

Abstract

In this work, we demonstrate the effects of direct ageing (DA) and stress relief annealing (SR) heat treatment on the microstructure evolution and residual stress changes of SLM formed AlSi10Mg alloys. The results show that the microstructure of the constructed AlSi10Mg alloy is mainly composed of α-Al and reticulated Si phases. Direct aging treatment promotes the precipitation of the nanophase and retains the reticulated Si structure, while the stress-relieving annealing destroys the reticulated Si structure, resulting in varying degrees of improvement in its mechanical properties. At 170 °C, 20% of the residual stress can be removed after 4 h, and the yield strength (YS) and ultimate tensile strength (UTS) of the alloy are 328 and 457 MPa, respectively, which are 38 and 7% higher than those in the forming state, and the elongation is slightly reduced. However, 60% of the residual stress can be removed by annealing at 400 °C for 2 h, but the yield strength (YS) and ultimate tensile strength (UTS) of the alloy are greatly reduced, which are 122 and 210 MPa, respectively, and the elongation is 16.8%.

直接时效和去应力退火对激光选择性熔化AlSi10Mg合金组织和性能的影响
在这项工作中,我们证明了直接时效(DA)和应力消除退火(SR)热处理对SLM成形AlSi10Mg合金的组织演变和残余应力变化的影响。结果表明:制备的AlSi10Mg合金组织主要由α-Al相和网状Si相组成;直接时效处理促进了纳米相的析出,保留了网状Si结构,而去应力退火则破坏了网状Si结构,使其力学性能得到不同程度的改善。在170℃下,4 h后可消除20%的残余应力,合金的屈服强度(YS)和极限抗拉强度(UTS)分别为328和457 MPa,比成形状态提高了38%和7%,伸长率略有降低。然而,在400℃下退火2 h可去除60%的残余应力,但合金的屈服强度(YS)和极限抗拉强度(UTS)却大大降低,分别为122和210 MPa,伸长率为16.8%。
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来源期刊
Metals and Materials International
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.
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