Effect of C Addition on Microstructure and Mechanical Properties of Ti-V-Cr Burn Resistant Titanium Alloys

doi:10.11901/1005.3093.2019.090

Chinese Journal of Materials Research

2019, Vol. 33

Issue (7): 537-542 DOI: 10.11901/1005.3093.2019.090

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Effect of C Addition on Microstructure and Mechanical Properties of Ti-V-Cr Burn Resistant Titanium Alloys

Huanying SUN¹(

),Jun ZHAO¹,Yi'an LIU¹,Quan ZHANG¹,Jingxia CAO²,Xu HUANG²

1. North China Institute of Aerospace Engineering, Langfang 065000, China
2. Beijing Institute of Aeronautical Materials, Beijing 100095, China

Cite this article:

Huanying SUN,Jun ZHAO,Yi'an LIU,Quan ZHANG,Jingxia CAO,Xu HUANG. Effect of C Addition on Microstructure and Mechanical Properties of Ti-V-Cr Burn Resistant Titanium Alloys. Chinese Journal of Materials Research, 2019, 33(7): 537-542.

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Abstract

The ingots with 120 mm diameter of burn resistant Ti-alloys with nominal composition of Ti-35V-15Cr, Ti-35V-15Cr-0.075C and Ti-35V-15Cr-0.15C were produced by vacuum arc consumable smelting. These ingots were deformed into bars with 25 mm diameter by sheathed extrusion. The microstructures of the ingots and extruded bars of burn resistant Ti-alloys were investigated. The tensile property, thermal stability and creep properties of the extruded bars of burn resistant Ti-alloys were tested under different conditions. The results show that burn resistant Ti-alloys with C addition have better ductility in tensile test due to refined grain size resulted from the sheathed extrusion process. Carbide can act as a stable sink for dissolved oxygen in the matrix, to improve the tensile ductility of the alloy even after hot exposure. In sum, the moderate C addition can improve the creep properties of burn resistant Ti-alloys.

Key words: metallic materials burn resistant titanium alloy carbide microstructure mechanical properties

Received: 31 January 2019

ZTFLH:

TG146.2

Fund: Key Projects of Hebei Educational Committee(ZD2018239);Langfang Science and Technology Project(2018011047);Foundation of North China Institute of Aerospace Engineering(ZD-2016-03)

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	Huanying SUN
	Jun ZHAO
	Yi'an LIU
	Quan ZHANG
	Jingxia CAO
	Xu HUANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.090 OR https://www.cjmr.org/EN/Y2019/V33/I7/537

Fig.1 Microstructures of ingots of burn resistant titanium alloys with different C addition: (a) Ti-35V-15Cr, (b) Ti-35V-15Cr-0.075C, (c) Ti-35V-15Cr-0.15C

Fig.2 Position of line in EDX analysis

Fig.3 Distribution curve of elementary compositions in the experimental alloy by EDX analysis (a) Ti, (b) V, (c) Cr, (d) C

Fig.4 Microstructures of extrusion bars of burn resistant titanium alloys with different C addition (a) Ti-35V-15Cr, (b) Ti-35V-15Cr-0.075C, (c) Ti-35V-15Cr-0.15C

Table 1 Room temperature tensile properties of alloys with different C addition

Fig.5 SEM fractographs of room temperature tensile samples of alloys with different C addition: (a) 0%, (b) 0.075%, (c) 0.15%

Table 2 550℃ temperature tensile properties of alloys with different C addition

Fig.6 SEM fractographs of 550℃ tensile samples of alloys with different C addition (a) 0%, (b) 0.075%, (c) 0.15%

Table 3 Room temperature tensile properties of alloys with different C addition exposed at 550℃ for 100 h

Fig.7 SEM fractographs of room temperature tensile samples exposed at 550℃ for 100 h of alloys with different C addition (a) 0%, (b) 0.075%, (c) 0.15%

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