Study on Interface of Linear Friction Welded Joint Between TC11 and TC17 Titanium Alloy

doi:10.11900/0412.1961.2018.00512

Acta Metall Sin

2019, Vol. 55

Issue (7): 885-892 DOI: 10.11900/0412.1961.2018.00512

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Study on Interface of Linear Friction Welded Joint Between TC11 and TC17 Titanium Alloy

Suigeng DU(

),Man GAO,Wanting XU,Xifeng WANG

Key Laboratory of Ministry of Education for Contemporary Design and Integrated Manufacturing Technology, Northwestern Polytechnical University, Xi'an 710072, China

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Abstract

As a solid-state welding technology, linear friction welding has unique advantages in machining dissimilar titanium alloy blade disc. However, there still lacks sufficient support in basic applied research, and the mechanism of interface formation is still under study. In this work, the microstructure of the welded joint between TC11 and TC17 titanium alloys was analyzed by OM, SEM and TEM, respectively. The results showed that common grains and common grain boundaries are formed at the weld interface. In the common grain, a phase boundary is formed in the weld interface. Elements diffusion is observed on both sides of the common grain boundary and the phase boundary in the common grain. Under the action of rejection, adsorption and towing of solute elements in the formation of common grains and common grain boundary, the observed diffusion distance of elements in the phase boundary of the common grain is longer than the one in the common grain boundary. The composition change at the phase boundary of the weld zone is greater than the one inside the phase. A large number of small needle-like α phases are formed at the weld interface that has a large number of deformed twins. The structure of the interface in common grains consists of two interfaces (recrystallization growth interfaces of both sides) and two growth regions (ordered and disordered). The dynamic recrystallization also has an ordered and disordered crystallization process similar to that of solidification crystallization.

Key words: titanium alloy linear friction welding weld interface

Received: 13 November 2018

ZTFLH:

TG457

Fund: National Natural Science Foundation of China(Nos.51675434);National Natural Science Foundation of China(10477017)

Corresponding Authors: Suigeng DU E-mail: fwcenter@nwpu.edu.cn

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Cite this article:

Suigeng DU,Man GAO,Wanting XU,Xifeng WANG. Study on Interface of Linear Friction Welded Joint Between TC11 and TC17 Titanium Alloy. Acta Metall Sin, 2019, 55(7): 885-892.

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00512 OR https://www.ams.org.cn/EN/Y2019/V55/I7/885

Fig.1 Microstructures of TC11 (a) and TC17 (b) alloys

Fig.2 Macromorphology of welded joint (WZ—weld zone, TMAZ—thermal mechanical affected zone)

Fig.3 SEM images of welded interface (a, d), common grain (b) and common grain boundary (c), and line scan fitting results of line A (e) and line B (f)

Fig.4 TEM images and corresponding selected area electron diffraction (SAED) patterns in TC11 side (a~d) and TC17 side (e) (a) TEM image of TMAZ in TC11 side(b) enlarged image of Fig.4a (Inset shows the SAED pattern)(c) TEM image of WZ in TC11 side(d) SAED pattern of Fig.4c(e) TEM image of WZ in TC17 side (Inset shows the SAED pattern of area A)

Fig.5 TEM images of bright field (a), dark field (b), magnified image (c) and line scan result (d) in the interface

Fig.6 HRTEM images (a, b, e, f) of Fig.5c and fast Fourier transformation (FFT) of area C (c) and area D (d)

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