Hot Deformation Mechanism and Ring Rolling Behavior of Powder Metallurgy Ti2AlNb Intermetallics

doi:10.1007/s40195-017-0583-6

Abstract

Abstract:

Powder metallurgy (PM) Ti-22Al-24Nb-0.5Mo (at.%) alloys were prepared by hot isostatic pressing. In order to study the feasibility of PM + ring rolling combined process for preparing Ti₂AlNb rings, thermal mechanical simulation tests of PM Ti₂AlNb alloys were conducted and two rectangular PM rings (150 mm in height, 75 mm in thickness, 350 mm in external diameter) were rolled as a validation experiment. Experimental results show that the flow stress of Ti₂AlNb alloys exhibited a significant drop at the very beginning of the deformation (true strain <0.1), and became stable with the increase in strain. Stress instability phenomenon of PM Ti₂AlNb alloys was more obvious than that of wrought alloy. Flow stress fluctuation at the initial stage of deformation is related to phase transition of Ti₂AlNb alloys which strongly depends on heat treatment and thermal mechanical deformation process. Processing windows during initial stage of ring rolling process is very crucial. A sound PM Ti₂AlNb rectangular ring blank (height = 150 mm, thickness = 30 mm, external diameter = 750 mm) was successfully rolled in two passes by using the improved heat preservation method and optimized rolling parameters. Tensile properties of PM Ti₂AlNb alloy were improved, and the porosity was reduced after ring rolling.

Key words: Ti₂AlNb alloy, Powder metallurgy, Hot deformation, Ring rolling

Zheng-Guan Lu, Jie Wu, Rui-Peng Guo, Lei Xu, Rui Yang. Hot Deformation Mechanism and Ring Rolling Behavior of Powder Metallurgy Ti₂AlNb Intermetallics[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(7): 621-929.

Figures/Tables 15

Fig. 1 Preparation route of Ti2AlNb ring blanks: a conventional method, b PM + rolling method

Table 1 Chemical composition and gas contents of Ti2AlNb powder and as-HIPed compacts (wt%)

Samples	O	N	H	Ar	Al	Nb	Mo	Ti
Powder	0.069	0.0080	0.0050	<0.0001	10.4	41.0	0.90	Bal.
Compacts	0.068	0.014	0.0025	<0.0001	10.6	41.3	0.90	Bal.

Fig. 2 Microstructures of compressed samples: a as-HIPed Ti2AlNb alloy, b as-HIPed + HT Ti2AlNb alloy

Table 2 Parameters of ring rolling for PM Ti2AlNb ring preforms

Rolling steps	Parameters
As-HIPed preforms	EIGA powder + HIPing, capsules removed Size: H₀ = 150 mm, T₀ = 75 mm, ED₀ = 350 mm
Heat preservation	Ceramic coatings + asbestos package
Pre-heating	23-1025 °C (5 °C/s), holding for 2 h
The first pass rolling	30 s
Re-heating	1025 °C, holding for 2 h
The second pass rolling	30 s
Post-heating	Furnace cooling, HT (solution + aging treatment)
Machining	Size: H₁ = 150 mm, T₁ = 55 mm, ED₁ = 450 mm (30% deformation in T) Size: H₂ = 150 mm, T₂ = 30 mm, ED₂ = 750 mm (60% deformation in T)

Fig. 3 a Horizontal ring rolling equipment, b final PM + rolled Ti2AlNb blank (~60% reduction)

Fig. 4 Flow behaviors of as-HIPed Ti2AlNb alloy and wrought Ti2AlNb alloy [27] at various conditions

Fig. 5 Stress decline comparison of a PM Ti2AlNb alloys, b wrought Ti2AlNb alloys

Fig. 6 Peak stress comparison of PM a, wrought b Ti2AlNb alloys at various temperatures (? = 0.1 s-1)

Fig. 7 Counter maps of strain rate sensitivity value m: a as-HIPed Ti2AlNb alloys, b wrought Ti2AlNb alloys

Fig. 8 Microstructures of PM Ti2AlNb alloys: a, b as-HIPed, c, d as-HIPed + rolled (30% deformation)

Fig. 9 Microstructures of as-HIPed (a), as-HIPed + rolled (b) Ti2AlNb alloy by EBSD analysis (blue color shows α2 phase, yellow color shows B2 phase, and green color shows O phase)

Table 3 Phase distribution of PM Ti2AlNb alloy observed by EBSD analysis

	V_α2 (%)	V_O (%)	V_B2 (%)
As-HIPed	7.3	58.1	34.6
30% rolled	5.6	22.6	71.8

Table 4 Tensile properties of as-HIPed and as-HIPed + rolled Ti2AlNb alloys

	T (°C)	0.2% YS (MPa)	UTS (MPa)	El (%)
HIPed	23	833	1034	8.0
HIPed	650	545	715	15.5
30% rolled	23	1240	1365	5.0
30% rolled	650	835	1090	5.0

Fig. 10 Porosity distributions of as-HIPed and 30% rolled Ti2AlNb alloys by Micro-CT analysis

Fig. 11 Comparisons of yield strength and elongation of PM Ti2AlNb alloys after HT

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Hot Deformation Mechanism and Ring Rolling Behavior of Powder Metallurgy Ti₂AlNb Intermetallics

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