Effect of Ta on High Temperature Tensile Properties of Advanced Ni-based Powder Metallurgy Superalloys

doi:10.11901/1005.3093.2018.494

Chinese Journal of Materials Research

2019, Vol. 33

Issue (5): 331-337 DOI: 10.11901/1005.3093.2018.494

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Effect of Ta on High Temperature Tensile Properties of Advanced Ni-based Powder Metallurgy Superalloys

Zhicheng WANG,Hao WANG(

),Hailiang HUANG,Benfu Hu

School of Material Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Cite this article:

Zhicheng WANG,Hao WANG,Hailiang HUANG,Benfu Hu. Effect of Ta on High Temperature Tensile Properties of Advanced Ni-based Powder Metallurgy Superalloys. Chinese Journal of Materials Research, 2019, 33(5): 331-337.

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Abstract

Microstructure and high temperature tensile properties of five powder metallurgy FGH98 alloys with different Ta content were systematically investigated by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscope (TEM) and high temperature tensile testing machine. The results show that: Ta can obviously eliminate the prior particle boundaries (PPB) and change the morphology of secondary γ'-phase. Ta can promote the generation of tertiary γ'-phase. Ta improved the high temperature tensile strength and yield strength of the alloys. When the Ta content was 2.4% (the same below), the alloy has the preferable plasticity. Alloys without Ta and with 1.2%Ta showed a crystalline-like fracture surface while the alloy with 2.4%Ta showed ductile fracture surface. Alloys with 3.6%Ta and 4.8%Ta exhibited transgranular and intergranular cleavage fractures. The alloy without Ta deformed mainly by generating a large number of twins and dislocations bypassing the γ'-phase. With the increasing Ta content, the dislocations shear the γ'-phase, therewith produce a large number of stacking faults.

Key words: metallic material Ni-based P/M superalloy microstructure tensile properties deformation mechanism

Received: 13 August 2018

ZTFLH:

TG132.3+2

Fund: National Natural Science Foundation of China(51571020);National Key Basic Research Program of China(2016YFB0700505)

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	Zhicheng WANG
	Hao WANG
	Hailiang HUANG
	Benfu Hu

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.494 OR https://www.cjmr.org/EN/Y2019/V33/I5/331

Table 1 Average grain size of different Ta content heat-treated alloys

Fig.1 3D APT map of alloy with 2.4%Ta

Fig.2

Fig.3 Morphology of γ' phase in alloy after heat treatment (a) 0%Ta; (b) 1.2%Ta; (c) 2.4%Ta; (d) 3.6%Ta; (e) 4.8%Ta

Table 2 Secondary and tertiary γ' size of alloys with different Ta contents after heat treatement

Fig.4 Tensile Properties of different Ta content alloys tested at 815℃

Fig.5 Fracture morphology of different Ta content alloys after test at 815℃ (a) 0%Ta; (b) 1.2%Ta; (c) 2.4%Ta; (d) 3.6%Ta; (e) 4.8%Ta

Fig.6 Microstructure of different Ta content alloys after stretch at 815℃ (a) 0%Ta; (b) 2.4%Ta; (c) 4.8%Ta

Fig.7 TEM images showing deformation microstructure of different Ta content alloys (a) 0%Ta alloy; (b) (c) 2.4%Ta alloy, (d) (e) 4.8%Ta alloy

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