Influence of cooling rate on phase transformation of TC21 alloy

Yi Hong Wang; Hong Chao Kou; Zhi Shou Zhu; Hui Chang; Lian Zhou; Jin Shan Li

doi:10.3969/j.issn.1005-5053.2010.1.002

Influence of cooling rate on phase transformation of TC21 alloy

Yi Hong Wang, Hong Chao Kou, Zhi Shou Zhu, Hui Chang, Lian Zhou, Jin Shan Li

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

The effects of cooling rates from elevated temperature on phase transformations in TC21 alloy were investigated by using end quenching. Samples from different regions (cooling rates) were analyzed by using optical micrograph (0M), Xray diffractometry (XRD), transmission electron microscopy (TEM), and Vickers microhardness. The results show that cooling rates above 122°C/s result in a martensitic transformation, a massive transformation being observed between 122 and 3°C/s, this transformation being gradually replaced by diffusion controlled Widmanst?tten α formation with decreasing cooling rate. These α layers was of two types, type 1 having a smoother appearance, type 2 having a zig-zagged appearance. With the cooling rates decreasing, the microhardness of TC21 alloy decreased after increased. When the cooling rates was smaller than 8°C/s, the microhardness of TC21 alloy decreased dramatically.

Original language	English
Pages (from-to)	6-10
Number of pages	5
Journal	Hangkong Cailiao Xuebao/Journal of Aeronautical Materials
Volume	30
Issue number	1
DOIs	https://doi.org/10.3969/j.issn.1005-5053.2010.1.002
State	Published - Feb 2010
Externally published	Yes

Keywords

End quenching
Microhardness
Phase transformation
TC21 titanium alloy

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10.3969/j.issn.1005-5053.2010.1.002

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abstract = "The effects of cooling rates from elevated temperature on phase transformations in TC21 alloy were investigated by using end quenching. Samples from different regions (cooling rates) were analyzed by using optical micrograph (0M), Xray diffractometry (XRD), transmission electron microscopy (TEM), and Vickers microhardness. The results show that cooling rates above 122°C/s result in a martensitic transformation, a massive transformation being observed between 122 and 3°C/s, this transformation being gradually replaced by diffusion controlled Widmanst?tten α formation with decreasing cooling rate. These α layers was of two types, type 1 having a smoother appearance, type 2 having a zig-zagged appearance. With the cooling rates decreasing, the microhardness of TC21 alloy decreased after increased. When the cooling rates was smaller than 8°C/s, the microhardness of TC21 alloy decreased dramatically.",

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author = "Wang, {Yi Hong} and Kou, {Hong Chao} and Zhu, {Zhi Shou} and Hui Chang and Lian Zhou and Li, {Jin Shan}",

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AU - Wang, Yi Hong

AU - Kou, Hong Chao

AU - Zhu, Zhi Shou

AU - Chang, Hui

AU - Zhou, Lian

AU - Li, Jin Shan

PY - 2010/2

Y1 - 2010/2

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AB - The effects of cooling rates from elevated temperature on phase transformations in TC21 alloy were investigated by using end quenching. Samples from different regions (cooling rates) were analyzed by using optical micrograph (0M), Xray diffractometry (XRD), transmission electron microscopy (TEM), and Vickers microhardness. The results show that cooling rates above 122°C/s result in a martensitic transformation, a massive transformation being observed between 122 and 3°C/s, this transformation being gradually replaced by diffusion controlled Widmanst?tten α formation with decreasing cooling rate. These α layers was of two types, type 1 having a smoother appearance, type 2 having a zig-zagged appearance. With the cooling rates decreasing, the microhardness of TC21 alloy decreased after increased. When the cooling rates was smaller than 8°C/s, the microhardness of TC21 alloy decreased dramatically.

KW - End quenching

KW - Microhardness

KW - Phase transformation

KW - TC21 titanium alloy

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Influence of cooling rate on phase transformation of TC21 alloy

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Keywords

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