Microstructure evolution and mechanical properties of a high-strength Mg-10Gd-3Y-1Zn-0.4Zr alloy fabricated by laser powder bed fusion

2021 ◽  
pp. 102517
Author(s):  
Qingchen Deng ◽  
Yujuan Wu ◽  
Qianye Wu ◽  
Yanting Xue ◽  
Yu Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Microstructure Evolution ◽  
High Strength ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

scholarly journals Influence of Powder Bed Temperature on the Microstructure and Mechanical Properties of Ti-6Al-4V Alloy Fabricated via Laser Powder Bed Fusion

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2278
Author(s):  
Lei-Lei Xing ◽  
Wen-Jing Zhang ◽  
Cong-Cong Zhao ◽  
Wen-Qiang Gao ◽  
Zhi-Jian Shen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Β Phase ◽  
Phase Precipitate ◽  
Bed Temperature ◽  
Martensitic Microstructure ◽  
Increasing Temperature

Laser powder bed fusion (LPBF) is being increasingly used in the fabrication of complex-shaped structure parts with high precision. It is easy to form martensitic microstructure in Ti-6Al-4V alloy during manufacturing. Pre-heating the powder bed can enhance the thermal field produced by cyclic laser heating during LPBF, which can tailor the microstructure and further improve the mechanical properties. In the present study, all the Ti-6Al-4V alloy samples manufactured by LPBF at different powder bed temperatures exhibit a near-full densification state, with the densification ratio of above 99.4%. When the powder bed temperature is lower than 400 °C, the specimens are composed of a single α′ martensite. As the temperature elevates to higher than 400 °C, the α and β phase precipitate at the α′ martensite boundaries by the diffusion and redistribution of V element. In addition, the α/α′ lath coarsening is presented with the increasing powder bed temperature. The specimens manufactured at the temperature lower than 400 °C exhibit high strength but bad ductility. Moreover, the ultimate tensile strength and yield strength reduce slightly, whereas the ductility is improved dramatically with the increasing temperature, when it is higher than 400 °C.

Heat-treatment effects on mechanical properties and microstructure evolution of Ti-6Al-4V alloy fabricated by laser powder bed fusion

2020 ◽  
Vol 816 ◽  
pp. 152615 ◽  
Author(s):  
Min-Tsang Tsai ◽  
Yi-Wen Chen ◽  
Chih-Yeh Chao ◽  
Jason S.C. Jang ◽  
Chih-Ching Tsai ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Microstructure Evolution ◽  
Treatment Effects ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

scholarly journals Adjustment of Mechanical Properties of Medium Manganese Steel Produced by Laser Powder Bed Fusion with a Subsequent Heat Treatment

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3081
Author(s):  
Lena Heemann ◽  
Farhad Mostaghimi ◽  
Bernd Schob ◽  
Frank Schubert ◽  
Lothar Kroll ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Retained Austenite ◽  
Intercritical Annealing ◽  
High Strength ◽  
Manganese Steel ◽  
Manganese Concentration ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Medium Manganese Steel

Medium manganese steels can exhibit both high strength and ductility due to transformation-induced plasticity (TRIP), caused by metastable retained austenite, which in turn can be adjusted by intercritical annealing. This study addresses the laser additive processability and mechanical properties of the third-generation advanced high strength steels (AHSS) on the basis of medium manganese steel using Laser Powder Bed Fusion (LPBF). For the investigations, an alloy with a manganese concentration of 5 wt.% was gas atomized and processed by LPBF. Intercritical annealing was subsequently performed at different temperatures (630 and 770 °C) and three annealing times (3, 10 and 60 min) to adjust the stability of the retained austenite. Higher annealing temperatures lead to lower yield strength but an increase in tensile strength due to a stronger work-hardening. The maximum elongation at fracture was approximately in the middle of the examined temperature field. The microstructure and properties of the alloy were further investigated by scanning electron microscopy (SEM), hardness measurements, X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and element mapping.

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