Realizing superior ductility of selective laser melted Ti-6Al-4V through a multi-step heat treatment

Li, Cheng Lin; Hong, Jae‐Keun; Narayana, P.L.; Choi, Sunwoong; Lee, Sang Won; Park, Chan Hee; Yeom, Jong‐Taek; Mei, Q.S.

doi:10.1016/j.msea.2020.140367

Cited by 49 publications

(13 citation statements)

References 34 publications

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“…In detail, the twin structures are fully dissolved only after 800 °C × 6 h [ 230 ]. The same results were obtained by Li et al [ 287 ] and Tsai et al [ 310 ]. On the other hand, the number of dislocations was deeply reduced after the HIP at 920 °C × 12 h with the formation of α + β lamellar microstructure rather than after the SR at 670 °C × 5 h as illustrated in Figure 50 [ 111 ].…”

Section: L-pbfed Ti6al4v: Microstructuresupporting

confidence: 88%

“…To avoid an excessive grain coarsening, Herzog et al [ 302 ] proposed an increase in pressure to 200 MPa and a consequent decrease in temperature up to 820 °C. Other studies, however, proposed different cooling pathways to control the α lamellar dimensions after the HIP heat treatments (from 500 nm of the α′ to 3 ÷ 60 μm of the α phase) [ 223 , 287 , 301 , 303 ].…”

Section: L-pbfed Ti6al4v: Microstructurementioning

confidence: 99%

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Additive Manufacturing of AlSi10Mg and Ti6Al4V Lightweight Alloys via Laser Powder Bed Fusion: A Review of Heat Treatments Effects

Ghio

Cerri

2022

Materials

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Laser powder bed fusion (L-PBF) is an additive manufacturing technology that is gaining increasing interest in aerospace, automotive and biomedical applications due to the possibility of processing lightweight alloys such as AlSi10Mg and Ti6Al4V. Both these alloys have microstructures and mechanical properties that are strictly related to the type of heat treatment applied after the L-PBF process. The present review aimed to summarize the state of the art in terms of the microstructural morphology and consequent mechanical performance of these materials after different heat treatments. While optimization of the post-process heat treatment is key to obtaining excellent mechanical properties, the first requirement is to manufacture high quality and fully dense samples. Therefore, effects induced by the L-PBF process parameters and build platform temperatures were also summarized. In addition, effects induced by stress relief, annealing, solution, artificial and direct aging, hot isostatic pressing, and mixed heat treatments were reviewed for AlSi10Mg and Ti6AlV samples, highlighting variations in microstructure and corrosion resistance and consequent fracture mechanisms.

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Section: L-pbfed Ti6al4v: Microstructuresupporting

confidence: 88%

Section: L-pbfed Ti6al4v: Microstructurementioning

confidence: 99%

Additive Manufacturing of AlSi10Mg and Ti6Al4V Lightweight Alloys via Laser Powder Bed Fusion: A Review of Heat Treatments Effects

Ghio

Cerri

2022

Materials

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“…38 In the present study, the texture strength of Zn-CNTs (19.74) is decreased to 5.15 for Zn-CNTs@Ag, which is in favor of induction twin crystals and activates the base slip. 46 Additionally, Zn-CNTs@ Ag have more fine-grain boundaries (Figure 5b), which provides enough space for substrate slip, thereby improving the ductility.…”

Section: Resultsmentioning

confidence: 99%

Rivet-Inspired Modification of Carbon Nanotubes by In Situ-Reduced Ag Nanoparticles To Enhance the Strength and Ductility of Zn Implants

Shuai

Dong

Yang

et al. 2021

ACS Biomater. Sci. Eng.

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Zinc shows promise for bone repair applications, while its strength and ductility require to be improved. Carbon nanotubes (CNTs) are exceptional reinforcements due to their superior strength, ultrahigh Young’s modulus, and large aspect ratio. However, their strong agglomeration and weak interfacial bonding with the matrix are key bottleneck problems restricting the reinforcing effect. In this study, Ag nanoparticles were in situ reduced on CNTs and then the CNT@Ag powders were used to prepare Zn-CNT@Ag implants by laser powder bed fusion. Results showed that Ag reacted with Zn to form a “knot”-like AgZn3 phase. It had the same lattice structure (HCP) with Zn, which indicated a good lattice matching with the matrix, thus improving the dispersion of CNTs. More significantly, the knot played a “rivet” role and enhanced the load transfer capacity, which advantaged the CNT strengthening effects by assisting in transferring the load. Moreover, it enhanced the heterogeneous nucleation effects during solidification, which weakened the texture strength of the matrix and thus increased the ductility by improving the sliding capacity. The compressive yield strength, ultimate tensile strength, and elongation of the Zn-CNT@Ag implant were increased by 22, 26, and 17% in comparison to Zn-CNTs. Moreover, the Zn-CNT@Ag implant exhibited favorable antibacterial activity with a bacterial inhibition rate of 87.79%. Additionally, it also exhibited a suitable degradation rate and acceptable biocompatibility.

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“…Moreover, a small amount of transformed β phase can be seen in Figure 4 d due to the low cooling rate of AC. In the case of WQ, the fast-cooling rate and the large degree of supercooling led to the inhibition of diffusion of alloy elements and the occurrence of martensitic transformation [ 18 , 19 ]. The α phase was distributed in the β matrix in a fine needle shape, forming a supersaturated solid solution.…”

Section: Resultsmentioning

confidence: 99%

Effect of Third-Stage Heat Treatments on Microstructure and Properties of Dual-Phase Titanium Alloy

Mao

Chen

et al. 2021

Materials

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Two-phase TC21 titanium alloy samples were solution-treated at 990 °C (β phase zone) and cooled by furnace cooling (FC), air cooling (AC), and water quenching (WQ), respectively. The second solution stage treatment was carried out at 900 °C (α + β phase zone), then aging treatment was performed at 590 °C. The influence of the size and quantity of the α phase on the properties of the sample were studied. The experimental results showed as the cooling rate increased after the first solution stage treatment, wherein the thickness of primary layer α gradually decreased, and the tensile strength and yield strength gradually increased. After the second solution stage treatment, the tensile properties of samples increased due to the quantity of layers α increased. The aging treatment promoted the precipitation of the dispersed α phase and further improved the tensile strength. After the third solution stage treatments, the FC samples with more β-phase had the best comprehensive mechanical properties.

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Realizing superior ductility of selective laser melted Ti-6Al-4V through a multi-step heat treatment

Cited by 49 publications

References 34 publications

Additive Manufacturing of AlSi10Mg and Ti6Al4V Lightweight Alloys via Laser Powder Bed Fusion: A Review of Heat Treatments Effects

Additive Manufacturing of AlSi10Mg and Ti6Al4V Lightweight Alloys via Laser Powder Bed Fusion: A Review of Heat Treatments Effects

Rivet-Inspired Modification of Carbon Nanotubes by In Situ-Reduced Ag Nanoparticles To Enhance the Strength and Ductility of Zn Implants

Effect of Third-Stage Heat Treatments on Microstructure and Properties of Dual-Phase Titanium Alloy

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