Microstructure, densification, and mechanical properties of titanium intermetallic alloy manufactured by laser powder bed fusion additive manufacturing with high-temperature preheating using gas atomized and mechanically alloyed plasma spheroidized powders

被引：67

作者：

Polozov, Igor ^{[1
]}

Sufiiarov, Vadim ^{[1
]}

Kantyukov, Artem ^{[1
]}

Razumov, Nikolay ^{[1
]}

Goncharov, Ivan ^{[1
]}

Makhmutov, Tagir ^{[1
,2
]}

Silin, Alexey ^{[1
]}

Kim, Artem ^{[1
]}

Starikov, Kirill ^{[1
]}

Shamshurin, Alexey ^{[1
,2
]}

Popovich, Anatoly ^{[1
]}

机构：

[1] Peter Great St Petersburg Polytech Univ, Inst Mech Engn Mat & Transport, Polytech Skaya 29, St Petersburg 195251, Russia

[2] Peter Great St Petersburg Polytech Univ, Design Mat Addit Mfg Lab, Polytech Skaya 29, St Petersburg 195251, Russia

来源：

ADDITIVE MANUFACTURING | 2020年 / 34卷

基金：

俄罗斯科学基金会;

关键词：

Additive manufacturing; Powder bed fusion; Titanium aluminides; Mechanical alloying; Microstructure; HEAT-TREATMENT; PHASE-TRANSFORMATION; TENSILE PROPERTIES; REHEAT CRACKING; NB; EVOLUTION; BEHAVIOR; FABRICATION; POROSITY; UNIQUE;

D O I：

10.1016/j.addma.2020.101374

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, Laser powder bed fusion (L-PBF) Additive Manufacturing with a high-temperature platform preheating was used to fabricate Ti2AlNb-based alloy samples. The Ti-22Al-22Nb-0.1Mo-0.3Hf-0.3Ta-1.5Zr-0.8Si0.9Fe (at %) powder obtained by mechanical alloying followed by plasma spheroidization as well as the Ti-24Al-25Nb-1Zr-1.4V-0.6Mo-0.3Si (at %) gas atomized (GA) powder were used as the feedstock material. Crackfree samples were fabricated using platform preheating temperatures of 600 degrees C and above, while lower preheating temperatures resulted in crack formation for both types of powders. The highest relative density of 99.3 % +/- 0.1 % was achieved using the mechanically alloyed plasma spheroidized (MAPS) powder, while the relative densities above 99.9 % +/- 0.1 % were obtained using the gas atomized powder. Platform preheating temperature significantly affected the microstructure and phase composition of the alloys as revealed by X-Ray diffraction, scanning electron microscopy, electron backscatter diffraction analysis. The phase transition temperatures were determined by differential scanning calorimetry. A fine cellular B2/5 microstructure was detected in case of relatively low preheating temperatures while using preheating temperatures of 600 degrees C and above resulted in in situ heat treatment with the formation of intermetallic Ti2AlNb-phase. An increased preheating temperature improved the chemical homogeneity of the samples fabricated from the MAPS powder. The resulted microstructure varied from fully B2/beta to B + O in the case of the MAPS powder and from B2/beta, B2 + O to fully-O in the case of the GA powder. The highest microhardness values were obtained using 700 degrees C preheating temperature, which corresponded to the highest O-phase volume fraction. The highest tensile strength was obtained for the samples fabricated at 980 degrees C preheating temperature.

引用

页数：14

共 60 条

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