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| Microstructural Inheritance Behavior and Mechanical Property Control of TA18 Alloy From Ingot to Tube Blank#br# |
| LI, Shuai-Yu, Yang, Jieren |
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1 College of Materials Science and
Engineering, Sichuan University, Chengdu 610065, China
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2 Shi-changxu Innovation Center for Advanced Materials, Institute of
Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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Cite this article:
LI, Shuai-Yu, Yang, Jieren. Microstructural Inheritance Behavior and Mechanical Property Control of TA18 Alloy From Ingot to Tube Blank#br#. Acta Metall Sin, 0, (): 0-.
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Abstract In metallic material processing, the microstructural
and textural characteristics developed during each manufacturing stage establish
the structural foundation for subsequent processing operations, creating substantial
hereditary effects throughout the multistage manufacturing chain. This
progressive, cross-process accumulation of microstructural and textural
evolution makes precise tracing and effective control of microstructural
inheritance pathways particularly complex during full-scale manufacturing from
the initial ingot to the final TA18 tube blank. Microstructural inheritance
forms the basis for structural design and property optimization in TA18 alloys.
This investigation employed a 700-mm diameter TA18 alloy ingot as the starting
material. The thermomechanical processing route comprised three stages: initial
multipass forging in the β-phase field (1150℃–950℃) followed by forging in the
α+β phase field at 900℃ to produce a 170-mm diameter rough-forged bar;
subsequent processing of the rough-forged bar in the two-phase region at 850°C
to obtain a 125-mm diameter finish-forged bar; finally, peeling, drilling, and
canned hot extrusion of the finish-forged bar to fabricate tube blanks with inner
and outer diameters of 28 and 42 mm, respectively. This study systematically
investigates the hereditary evolution of microstructure and texture throughout
the processing route from ingot to tube blank in the TA18 alloy and evaluates its
impact on mechanical properties to guide the integrated control of multiscale
microstructure and performance. The results demonstrate that microstructural
hereditary characteristics can be categorized into three primary types. (1) Once
established during rough forging, the micron-scale grain size and equiaxed
α-phase morphology remain stably inherited in subsequent processing stages.
Grain refinement serves as the fundamental basis for increasing axial tensile
strength from 400 to 550 MPa and improving elongation. (2) The inheritance of
low-angle grain boundary (LAGB) content exhibits dynamic evolution. The high
content inherited during the rough- and finish-forging stages contributes to
work hardening but negatively affects plasticity; in contrast, the low content
inherited after extrusion, achieved via complete recrystallization, results in
plasticity recovery. (3) The inheritance of crystallographic texture is
governed by multiple competing mechanisms. The {0001}∥axial direction (AD) basal texture and the1010∥AD texture originating from
the central region of the ingot are strongly inherited during subsequent
processing, with the intensity of the1010∥AD texture continuously
increasing. The c-axis orientation of the α-phase undergoes controlled
evolution during processing: it is randomly distributed after rough forging,
transforms into a radial texture after finish forging, and finally develops
into a circumferential texture after extrusion. The TA18 alloy controls the inheritance
and evolution of crystallographic orientation through the competition and
synergy of various mechanisms, including initial crystallographic orientation,
deformation, and dynamic recrystallization. The integrated design of TA18 alloy
tube blanks, possessing high strength and good plasticity can be achieved by
reinforcing beneficial hereditary features (such as fine grains and favorable
texture) and interrupting harmful features (such as high LAGB content and unfavorable
texture).
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Received: 12 November 2025
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