Investigation of the effects of different heat treatment parameters on the corrosion and mechanical properties of the AlSi10Mg alloy produced with direct metal laser sintering

Özer, Gökhan; Tarakçı, Gürkan; Yılmaz, Mustafa Safa; Oter, Zafer Cagatay; Sürmen, Ömer; Akça, Yaşar; Coşkun, Mert; Koç, Ebubekir

doi:10.1002/maco.201911171

Cited by 32 publications

(8 citation statements)

References 32 publications

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“…However, tensile strength and ductility of the T6-only samples are lower than as stress-relieved state, which is most probably due to higher amount of surface porosity and inner pores of bigger size. This decrease in tensile strength and strain for T6-only condition is parallel with the findings of previous studies regarding T6 heat treatment of SLM AlSi10Mg material (Ozer et al, 2019;Kan et al, 2019;. Moreover, when "HIP 1 4h aged" and "T6-only (4 h aged)" conditions are compared, there is a huge difference especially in strength values as heat treatment after HIP process results in improved mechanical properties than T6-only condition.…”

Section: Mechanical Propertiessupporting

confidence: 87%

Effect of HIP process and subsequent heat treatment on microstructure and mechanical properties of direct metal laser sintered AlSi10Mg alloy

Ertuğrul

Oter

Yılmaz

et al. 2020

RPJ

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Purpose The purpose of this paper is to evaluate the effect of post process combinations, e.g. hot isostatic pressing (HIP) only, HIP + T6 heat treatments, and T6 only, with different aging time, on surface properties, microstructure and mechanical properties of stress-relieved AlSi10Mg parts produced by direct laser metal sintering. Design/methodology/approach HIP process and HIP + T6 heat treatments were applied to as stress-relieved direct laser metal sintered (DMLS) AlSi10Mg parts. Aging times of 4 and 12 h are selected to examine the optimum duration. To analyze the advantages of HIP process, a T6 heat treatment with 4 h of aging was also applied. Densities, open porosities and roughness values of as stress-relieved, HIPed, HIP + T6, and T6-only samples were measured. The samples were characterized by OM and SEM together with EDX analysis. An image analysis study was made to evaluate the inner pore structure, thereby to understand the mechanical behavior. Findings HIP process does not cause a significant change in surface porosity; yet it has a positive influence on inner porosity. HIP process results in a microstructure of the aluminum matrix surrounded by a network of micron and nano size Si particles. Additional heat treatment results in larger particles and precipitation. After HIPing, ductility increases but strength decreases. Samples aged 4 h present improved yield and tensile strength but decreased elongation, yet samples aged for 12 h reach a combination of optimum strength and ductility. The lower level of tensile strength and ductility in T6-only condition indicates that HIP process plays a crucial role in elimination of the porosity thus improves the effectiveness of subsequent heat treatment. Originality/value The study investigates the effect of post-process conditions and optimizes the aging time of the T6 heat treatment after HIP process in order to obtain improved mechanical properties. The stress-relieved state was chosen as the reference to prevent distortion during HIPing or heat treatment.

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Section: Mechanical Propertiessupporting

confidence: 87%

Effect of HIP process and subsequent heat treatment on microstructure and mechanical properties of direct metal laser sintered AlSi10Mg alloy

Ertuğrul

Oter

Yılmaz

et al. 2020

RPJ

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“…However, pores are still the main defects in the SLMed AlSi10Mg parts. Pores induce the stress concentration, reduce the density and performances (Özer et al , 2019). The mechanical properties of the SLMed AlSi10Mg parts are unstable and unreliable, which restricts their applications significantly.…”

Section: Introductionmentioning

confidence: 99%

Pores and the formation mechanisms of SLMed AlSi10Mg

Wang

Dai

Liao

et al. 2020

RPJ

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Purpose To fabricate high performance parts, this paper aims to systematically study the pores characteristics and their formation mechanisms in selective laser melting (SLM) AlSi10Mg. Design/methodology/approach Cubes of 10 × 10 × 5 mm were manufactured in different laser power, scan speed and scan space. Optical microscope (OM) and scanning electron microscopes (SEM) were used to observe morphology of pores. Findings Round or irregular pores were found in SLMed AlSi10Mg parts. All the round pores have smooth inner walls and locate in the melt pool. The formation mechanisms of the round pores are contributed to the evaporation of elements in the melt pool, H2O, high laser energy input and hollow powder. Irregular pores have rough inner walls. Big scan space, unevenness of the upper surface, large layer thickness, spatter and oxide are the main reasons of generating irregular pores which outside the melt pool. Instability of keyhole leads to the irregular pores locate in the bottom of keyhole mode melt pool. Originality/value Relationship between pores and melt pool were studied systematically for the first time. Researches of pores characteristics and their formation mechanisms in SLMed AlSi10Mg would be a valuable reference for researchers to obtain an important insight into and control the defect in SLMed Al alloy.

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“…The corrosion rate was higher in the samples with a high porosity value, which is expected. It contains the electrochemical solution of the cavities in the material and creates regional differences in concentration and pH [33]. As a result of this difference, the material erosion is higher than the surfaces without porosity [34].…”

Section: Resultsmentioning

confidence: 99%

A Determination of the Corrosion and Microstructure Properties of AlSi10Mg Material Produced by Different Direct Metal Laser Sintering (DMLS) Process Parameters

Yılmaz

2022

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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Additive Manufacturing (AM) has been developing with increasing interest in recent years. The development in this technology will accelerate with the increase in material, process, and product quality. It is therefore essential to investigate these shortcomings of additive manufacturing products. In this study, the microstructure and corrosion properties of the material (AlSi10Mg) were investigated by changing the production parameters in the Direct Metal Laser Sintering (DMLS) process. Energy density was considered in parameter selection. The corrosion, topography, and mechanical properties of the DMLS-AlSi10Mg material were investigated in detail, depending on the process parameters. It has been determined that the corrosion resistance and hardness of the material are directly related to the porosity level in the structure.

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Investigation of the effects of different heat treatment parameters on the corrosion and mechanical properties of the AlSi10Mg alloy produced with direct metal laser sintering

Cited by 32 publications

References 32 publications

Effect of HIP process and subsequent heat treatment on microstructure and mechanical properties of direct metal laser sintered AlSi10Mg alloy

Effect of HIP process and subsequent heat treatment on microstructure and mechanical properties of direct metal laser sintered AlSi10Mg alloy

Pores and the formation mechanisms of SLMed AlSi10Mg

A Determination of the Corrosion and Microstructure Properties of AlSi10Mg Material Produced by Different Direct Metal Laser Sintering (DMLS) Process Parameters

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