Microstructure of Ti-42Al-9V Alloy Sheets and Impact of Single Pass and Multiple Pass Rolling

TANG Peng; LIANG Guozheng; XU Xiaokun; ZHANG Shuzhi; ZHANG Xinyu; LIU Riping

doi:10.3969/j.issn.1674-6457.2025.07.002

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (7) : 9-20. DOI: 10.3969/j.issn.1674-6457.2025.07.002

Composite Material Rolling Technology and Equipment

Microstructure of Ti-42Al-9V Alloy Sheets and Impact of Single Pass and Multiple Pass Rolling

TANG Peng, LIANG Guozheng, XU Xiaokun, ZHANG Shuzhi, ZHANG Xinyu, LIU Riping

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Abstract

The work aims to conduct single-pass and multi-pass high strain rate rolling processes on forged Ti-42Al-9V alloy and systematically investigate the microstructural characteristics and deformation mechanisms of the sheets under these two processing conditions, along with an in-depth analysis of the fracture mechanisms of the rolled alloy. Through the application of high strain rate rolling technology, the evolution laws of microstructures and the associated deformation mechanisms for both single-pass and multi-pass rolled sheets were thoroughly discussed. In the case of single-pass rolled sheets, the microstructure primarily consisted of a needle-like β/γ mixed structure and blocky α₂/γ lamellar clusters, forming a dual-phase structure. Twinning occurred within the α phase at elevated temperatures. For multi-pass rolled sheets, the microstructure was predominantly composed of (α/α₂+γ) lamellar clusters, along with residual β and γ phases distributed at the boundaries of these clusters. The microstructural evolution in multi-pass rolling was mainly attributed to the fragmentation and decomposition of (α/α₂+γ) lamellar clusters, which led to dynamic recrystallization behavior. During single-pass high strain rate rolling, stress concentration occurs at the boundaries of massive α phases, resulting in dislocation accumulation. Consequently, dynamic recrystallization preferentially initiates at these boundaries, leading to the formation of fine recrystallized grains. The deformation mechanisms of lamellar clusters during the dynamic recrystallization process in multi-pass high strain rate rolled sheets can be categorized into three primary modes of spheroidization of laminates, twinning-induced nucleation, and bending/twisting.

Key words

Ti-42Al-9V alloy / forging / high strain rate rolling / heat treatment / microstructure / deformation mechanism

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TANG Peng, LIANG Guozheng, XU Xiaokun, ZHANG Shuzhi, ZHANG Xinyu, LIU Riping. Microstructure of Ti-42Al-9V Alloy Sheets and Impact of Single Pass and Multiple Pass Rolling[J]. Journal of Netshape Forming Engineering. 2025, 17(7): 9-20 https://doi.org/10.3969/j.issn.1674-6457.2025.07.002

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Funding

; Fund：National Natural Science Foundation of China (52271118, 52071228); National Key Research and Development Program of China (2024ZD0703901); Yanzhao Golden Platform Talent Program (Education Platform) (HJZD202511)