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Research Papers: Gas Turbines: Structures and Dynamics

An Experimental Study for the Development of Mandrel-Free Hot-Spinning for Large Size Titanium Alloy Plate Forming

[+] Author and Article Information
Yoshihide Imamura

Material Research Department,
Technical Institute,
Corporate Technology Division,
Kawasaki Heavy Industries, Ltd.,
1-1, Kawasaki-cho,
Akashi City 673-8666, Hyogo, Japan
e-mail: imamura_yoshihide@khi.co.jp

Ken Ikawa

Material Research Department,
Technical Institute,
Corporate Technology Division,
Kawasaki Heavy Industries, Ltd.,
1-1, Kawasaki-cho,
Akashi City 673-8666, Hyogo, Japan
e-mail: ikawa_ken@khi.co.jp

Kojiro Motoyama

Material Research Department,
Technical Institute,
Corporate Technology Division,
Kawasaki Heavy Industries, Ltd.,
1-1, Kawasaki-cho,
Akashi City 673-8666, Hyogo, Japan
e-mail: motoyama_kojiro@khi.co.jp

Hayato Iwasaki

Material Research Department,
Technical Institute,
Corporate Technology Division,
Kawasaki Heavy Industries, Ltd.,
1-1, Kawasaki-cho,
Akashi City 673-8666, Hyogo, Japan
e-mail: iwasaki_ha@khi.co.jp

Takeo Hirakawa

Engine Production Engineering Department,
Manufacturing Division,
Aerospace Systems Company,
Kawasaki Heavy Industries, Ltd.,
1-1, Kawasaki-cho,
Akashi City 673-8666, Hyogo, Japan
e-mail: hirakawa_t@khi.co.jp

Hiroshi Utsunomiya

Professor
Division of Materials and
Manufacturing Science,
Graduate School of Engineering,
Osaka University,
2-1, Yamada-oka, Suita City,
Osaka 565-0871, Japan
e-mail: uts@mat.eng.osaka-u.ac.jp

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 9, 2018; final manuscript received July 24, 2018; published online October 4, 2018. Editor: Jerzy T. Sawicki.

J. Eng. Gas Turbines Power 141(3), 032501 (Oct 04, 2018) (8 pages) Paper No: GTP-18-1472; doi: 10.1115/1.4041161 History: Received July 09, 2018; Revised July 24, 2018

A mandrel-free hot-spinning was developed as a near-net-shape titanium alloy plate forming technique. In this work, a Ti–6Al–4V alloy conical product with a wall angle of 34 deg and 170 mm height was formed from a large size Ti–6Al–4V plate (890–920 mm diameter × 30 mm thick). The product was characterized metallurgically and mechanical properties were measured, and the shape of formed products was investigated. It was found that the mandrel-free hot-spinning is able to form a large size titanium alloy plate. Material properties including tensile strength and microstructure of the formed products satisfied the material specifications. Fatigue stress of the formed product was higher than that of the typical Ti–6Al–4V material. For a further improvement, a forming method using preformed material was proposed and which was successfully conducted with two types of preforms and found to be effective in the forming process.

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References

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Figures

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Fig. 1

Mandrel-free hot-spinning system: (a) Schematics of mandrel-free hot-spinning system, (b) schematics of the mandrel-free hot-spinning machine, and (c) the operating mandrel-free hot-spinning machine that was used in this work

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Fig. 2

Comparison with production process

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Fig. 3

Dimensions of mechanical test specimen: (a) tensile test specimen and (b) fatigue test specimen

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Fig. 4

Situation of forming test: (a) during forming and (b) hot-spun product

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Fig. 5

Tensile properties of hot-spun product

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Fig. 6

Fatigue properties of hot-spun product

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Fig. 7

Microstructure of hot-spun product from 900 mm diameter plate: (a) cross section, (b) nonformed part, and (c) hot-spun part

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Fig. 8

Inverse pole figure map showing grain orientation in circumferential direction of hot-spun product: (a) nonformed part and (b) hot-spun part

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Fig. 9

Mean α grain size of hot-spun product

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Fig. 10

Wall thickness distribution of hot-spun product

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Fig. 11

Wall angle of hot-spun product

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Fig. 12

Roundness of hot-spun product

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Fig. 13

Schematic shape of preformed material: (a) preformed shape A and (b) preformed shape B

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Fig. 14

Wall thickness distribution of hot-spun product using preformed material A

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Fig. 15

Cross section of hot-spun product using preformed material B

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Fig. 16

Wall thickness distribution of hot-spun product using preformed material B

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