Study of heat treatment parameters for additively manufactured AlSi10Mg in comparison with corresponding cast alloy
Study of heat treatment parameters for additively manufactured AlSi10Mg in comparison with corresponding cast alloy
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DOI：
10.1016/j.msea.2018.10.026
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发表时间：
2019-01-02
期刊：
影响因子：
6.4
通讯作者：
Pola, Annalisa
中科院分区：
文献类型：
--
作者：
Girelli, Luca;Tocci, Marialaura;Pola, Annalisa
为了消除AlSi 10 Mg合金的逐层结构所导致的各向异性，通常对增材制造的AlSi 10 Mg合金进行固溶、淬火和时效热处理。本文研究了固溶和时效处理温度和时间对显微组织的影响，采用直接金属激光烧结法制备了AlSi10Mg合金，并对重力铸造法制备的AlSi10Mg合金进行了对比研究分析了相同热处理条件下的不同响应。在选定的热处理参数后，硬度达到最高，同时气孔率也有可接受的增加。还发现，与生产状态相比，该处理导致极限拉伸强度降低，而不影响增材制造样品的屈服强度，并且减小了沿两个构建方向沿着的性质差异。所生产的样品的高性能与更精细的显微组织有关，并且如通过差示扫描量热测量所证明的，与自淬灭现象有关。
A solution, quenching and ageing heat treatment is often performed on additive manufactured AlSi10Mg parts to dissolve the anisotropy due to the layer-by-layer building.This study investigates the influence of temperature and duration of solution and ageing treatment on microstructure, hardness and density of AlSi10Mg alloy produced by direct metal laser sintering.A parallel investigation is carried out on AlSi10Mg samples produced by gravity casting to analyse the different response to the same heat treatment conditions.The highest hardness, combined with an acceptable increase of porosity, is reached after selected heat treatment parameters. It was also found that, compared to the as-produced condition, this treatment leads to a decrease of ultimate tensile strength, without affecting the yield strength of additive manufactured samples, and reduces the difference in properties along the two building directions. The high properties of the as-produced samples are related to the finer microstructure and, as proved by the differential scanning calorimetric measurements, to the self-quenching phenomenon.