Rolling texture and its effect on tensile property of a near-α titanium alloy Ti60 plate

doi:10.1016/j.jmst.2018.10.032

材料科学与技术 ›› 2019, Vol. 35 ›› Issue (5): 790-798.DOI: 10.1016/j.jmst.2018.10.032

收稿日期:2018-08-12 接受日期:2018-10-08 出版日期:2019-05-10 发布日期:2019-02-20

Rolling texture and its effect on tensile property of a near-α titanium alloy Ti60 plate

Wenyuan Li^a^b, Zhiyong Chen^a^?(), Jianrong Liu^a, Shaoxiang Zhu^a, Guoxin Sui^a, Qingjiang Wang^a

^aInstitute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^bUniversity of Chinese Academy of Sciences, Beijing 100049, China

Received:2018-08-12 Accepted:2018-10-08 Online:2019-05-10 Published:2019-02-20
Contact: Chen Zhiyong
About author:
¹ These authors contribute equally to this paper.

摘要/Abstract

Abstract:

Rolling texture and its effect on tensile properties of Ti60 alloy plates were investigated in the present study. The plates were β-rolled at 1070 °C and (α + β)-rolled at 980 °C, using uni-directionally rolling (UDR) and cross-directionally rolling (CDR) processes, respectively. β-rolled plates exhibited weak textures, which were attributed to the dispersive orientations of secondary α during the β → α phase transformation. Strong deformation textures formed in (α + β)-rolled plates as a result of slipping mechanisms: the strong T-type texture in UDR plate was related to {10 1ˉ0}[11 2ˉ0] slipping, while the B-type texture in CDR plate was relevant with {0001}[11 2ˉ0] slip. Strong T-type textures led to anisotropic tensile properties. B-type textures would decrease such an anisotropy. The (α + β)-CDR process was found to be a candidate process for reducing anisotropy of Ti60 alloy plates.

Key words: Ti60 alloy plates, Rolling texture, Anisotropy, Tensile properties

. [J]. 材料科学与技术, 2019, 35(5): 790-798.

Wenyuan Li, Zhiyong Chen, Jianrong Liu, Shaoxiang Zhu, Guoxin Sui, Qingjiang Wang. Rolling texture and its effect on tensile property of a near-α titanium alloy Ti60 plate[J]. J. Mater. Sci. Technol., 2019, 35(5): 790-798.

图/表 14

Fig. 1 Microstructure of as-rolled slab of Ti60 alloy.

Fig. 2 Schematic figures of rolling process and plates.

Fig. 3 Microstructures of as-rolled Ti60 alloy plates of different rolling processes: (a) β-UDR; (b) β-CDR; (c) α?+?β-UDR; (d) α?+?β-CDR.

Fig. 4 Pole figures (PFs) of as-rolled Ti60 alloy plates of different processes: (a) β-UDR; (b) β-CDR; (c) α?+?β-UDR; (d) α?+?β-CDR.

Table 1 Room temperature tensile properties of Ti60 alloy plate.

Rolling process	Direction	YS (MPa)	UTS (MPa)	Elongation (%)
β-UDR	TD	1080	1158	9.0
	TD	1079	1159	11.0
	45°	1041	1109	9.0
	45°	1037	1105	9.5
	RD	1081	1142	7.0
	RD	1085	1143	8.0
β-CDR	TD	1049	1135	10.5
	TD	1049	1137	10.0
	45°	1014	1093	9.5
	45°	1025	1104	10.0
	RD	1027	1102	9.5
	RD	1027	1100	10.0
α?+?β-UDR	TD	1156	1253	7.5
	TD	1146	1244	7.0
	45°	1006	1063	12.5
	45°	999	1060	10.5
	RD	1102	1162	8.0
	RD	1111	1179	7.0
α?+?β-CDR	TD	1127	1180	14.0
	TD	1120	1173	12.0
	45°	1085	1127	11.5
	45°	1080	1123	10.0
	RD	1133	1180	10.5
	RD	1127	1180	9.0

Table 2 600?°C tensile properties of Ti60 alloy plate.

Rolling process	Direction	YS (MPa)	UTS (MPa)	Elongation (%)
β-UDR	TD	605	715	14.5
	TD	610	730	13.5
	45°	551	666	26.5
	45°	550	662	26.5
	RD	580	685	20.5
	RD	580	685	20.0
β-CDR	TD	595	700	16.5
	TD	590	715	16.0
	45°	547	659	26.5
	45°	554	670	26.5
	RD	565	665	18.5
	RD	565	675	18.5
α?+?β-UDR	TD	615	760	15.5
	TD	615	760	18.0
	45°	499	612	25.5
	45°	491	607	26.5
	RD	570	690	26.5
	RD	570	695	26.0
α?+?β-CDR	TD	515	650	24.5
	TD	530	650	27.5
	45°	520	627	33.5
	45°	513	622	26.5
	RD	510	650	31.5
	RD	510	645	32.5

Fig. 5 (0002) pole figure of slab.

Fig. 6 Microstructures of heat treated slabs at: (a) 1070?°C; (b) 980?°C.

Fig. 7 EBSD analysis on orientation information of α laths in β-rolled plate by means of (a) Euler distribution map and (b) (0001) PF.

Fig. 8 Pole figures of α?+?β-rolled 10-mm plate.

Fig. 9 Schematic of α orientation evolution during rolling.

Fig. 10 Tensile properties at room temperature of Ti60 plates: (a) YS; (b) UTS.

Fig. 11 Tensile properties at 600?°C of Ti60 plates: (a) YS; (b) UTS.

Fig. 12 Diagrammatic sketch of Schmid factors in (a) T-type textured and (b) B-type textured plates.

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Rolling texture and its effect on tensile property of a near-α titanium alloy Ti60 plate

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