Development of New Alpha+Beta Titanium Alloy of · PDF fileDevelopment Target g h h DAT5 hig...

Development of New Alpha+Beta Titanium Alloy of Vanadiumless

Toshiharu NodaAdvanced Material Research Department

Special Steel Research Lab. Daido Corporate R&D Center

2007.10.09TITANIUM 2007 page 1

Daido Corporate R&D Center

Daido’s Titanium AlloysAlloy developed by Daido

Plant

SportsDAT5(6Al-4V)DAT51(22V 4Al) MedicalPlant

DT2(CP-Ti)DT7(0.15Pd)

DAT51(22V-4Al)DAT15G(15-3-3-3) DAT55G(15V-6Cr-4Al)CA Ti

MedicalDT2，DT4(CP-Ti) DAT5E(6-4 ELI) DAT67(6Al-7Nb)

PPC furnace

CA Ti VLTi

DAT67(6Al-7Nb)

GFM forging machineLEVICAST LEVI atomization

AutomobileDAT52F(3Al-2V-REM-S)DAT5M(6Al-4V-Fe)

AerospaceDAT5(6Al-4V)DAT53(6Al-6V-2Sn)

DAT62M(6-2-4-2S)DAT54γTIAl(33.5Al-4.8Nb-1Cr-0 3Si)

DAT53(6Al 6V 2Sn) DAT54(6Al-4Sn-4Zr-3Mo-1Nb-0.4Si-0.06C)


0.3Si)VLTi

Recent Price of Vanadium Raw Material

120

ref. Metal Bulletin

(f di FV)100

120 (ferro-vanadium:FV)

kg. o

f V)

To supply more economical and stable price titanium alloy

60

80

V (U

S$/k

12 times

To supply more economical and stable price titanium alloy,

a new alloy without expensive alloying element is necessary.

20

40

rice

of F

V

4 times

020072006200520042003200220012000

Pr


Concept of New Alpha+Beta Alloy

Requirement of cost Recent rapid price increase ofRequirement of cost reduction of titanium alloys

Recent rapid price increase of raw material (Vanadium etc.)

Application of low cost titanium raw material Vanadiumless alloy

(Off-grade titanium sponge)y

Vanadiumless titanium alloyVLTi


VLTi

Development Target

hgh

h

igDAT5(Ti-6Al-4V)

Ti-6Al-4VTarget

ost

hig

Off-GradeTitaniumSponge

Ti alloy Scrap

Stre

ngth

the same properties as Ti 6Al 4Vuctio

n co

Ti-64FE

SpongeDAT5M

T t

V Fe

wS

DAT5 :Ti-6Al-4VDAT5M:Ti-6Al-4VTi64FE:Ti 6Al 4V Fe

the same properties as Ti-6Al-4V・Hot workability・Strength

w

Prod

u Target

low

low Production cost high1970 2010

Year

Ti64FE:Ti-6Al-4V-Fe

low

1980 1990 2000


Daido’s approach to cost reduction of Ti alloys

Off-Grade Titanium Sponge

Titanium raw materials for

・Aircraft materials<5

・Mill product5-20

20-50

Off-Grade titanium sponge

(Raw material for steel making)

0 50

50-100100-1000

Example of Iron distribution in sponge masses

( g)

Content(ppm)

>1000


p p gTakahashi:Titanium Japan,44(1996),77-80.

Alloy DesignTi-6Al-4V(base alloy)

Off-Grade titanium spongeAlpha stabilizing element

6％Al＝6％

for high temperature strengthBeta stabilizing element

V Fe

V equivalence：4V 1Fe

VLTi(Ti-6Al-1Fe)

for formability and heat treatment ability


( )

MicrostructureAnnealed

Annealed at 750oC


Ti-6Al-4V VLTi(Ti-6Al-1Fe)

Hot Workabilitycross head speed : 50.8mm/s

Test Temp.X

60sec

T t diti

120

400

500

a)

VLTiTi-6Al-4V (%

)

Test condition

80

100

300

400

tres

s(M

Pa Ti-6Al-4V

on o

f are

a(60100

200

Flow

st

Red

uctio

VLTiTi-6Al-4V

40500 700 900 1100 1300 1500

0500 700 900 1100 1300 1500

Temperature(oC) Temperature(oC)


Tensile Properties at Room Temperature

1000

1200

of

100

ea(%

)

VLTi Ti-6Al-4V

800

1000

0.2%

Pro

oPa

)

60

80

on o

f are

600

reng

th, 0

tres

s(M

P

40

60

Red

uctio

200

400

ensi

le s

tr st

20

40

ngat

ion,

0

200

Tensile 0 2% Proof Elongation Reduction of

Te

0

Elon

2007.10.09TITANIUM 2007 page 10

Tensilestrength

0.2% Proofstress

Elongation Reduction ofarea

Relationship Between Fatigue and Tensile Strength

700SUH11: 1050oC/0.5h/OQ+720 C/1h/ACng

wb/ B=0 5

σwb/σB=0.6

500

600 720oC/1h/AC RT

400oCg be

ndin

h (M

Pa) σwb/σB=0.5

300

400400oC

s ro

tatin

e st

reng

th

100

200VLTiTi-6Al-4V

07C

ycle

sfa

tigue

SUH11(JIS)

0

100

0 200 400 600 800 1000 1200 1400

10 SUH11(JIS)(8Cr-1.5Si-0.5C)

2007.10.09TITANIUM 2007 page 11

Tensile strength(MPa)

Balance of Density and Strength

5 0

5.1Ti-15Mo-5Zr(ST)

Ti 11 5Mo 6Zr 4 5Sn(ST)

ST: solution treatedA : annealed

4 8

4.9

5.0

cm3 )

Ti-11.5Mo-6Zr-4.5Sn(ST)

Ti-3Al-8V-6Cr-4Mo-4Zr(ST)Ti-13V-11Cr-3Al(ST)

Beta Alpha+Beta

4 6

4.7

4.8

sity

(g/c Ti-13V-11Cr-3Al(ST)

Ti-15V-6Cr-4Al(ST)Ti-15V-3Al-3Cr-3Sn(ST)

Ti 22V 4Al(ST)

4 4

4.5

4.6

Den

s Ti-22V-4Al(ST)

Ti-6Al-4V(A) Ti-6Al-1.7Fe-0.1Si(A)

Ti-4.5Al-3V-2Mo-2Fe(A)

4.3

4.4

700 900 1100 1300

VLTi(A)( ) ( )

12001000800

2007.10.09TITANIUM 2007 page 12

Tensile Strength (MPa)

Production ProcessPPC (2ton)Off-grade titanium sponge

Ti scrapAlloying element

VARAlloying element

Hot Rolling

Bar Rolling

Annealing

Wire Rolling

Annealing Annealing

bar

Annealing

wirePPC Process

(Plasma Progressive Casting)

2007.10.09TITANIUM 2007 page 13

barwire

Application of VLTi

VLTi l Ti 6Al 4V llVLTi can replace Ti-6Al-4V alloy.

Typical application of VL Ti :Typical application of VL Ti :

Golf club heads

Intake engine valves

C ti R dConnecting Rods

2007.10.09TITANIUM 2007 page 14

Example of Application

Golf club headAdditional

i htweight

VLTiHighest moment of inertiaHighest moment of inertia

Released in Oct. 2007 Photo :Photo :

2007.10.09TITANIUM 2007 page 15

Photo :Photo :courtesy of BRIDGESTONE SPORTS CO.,LTD.courtesy of BRIDGESTONE SPORTS CO.,LTD.

Conclusion

In order to supply more economical and stable price titanium alloy,new alpha + beta titanium alloy VLTi(Ti6Al1Fe) without vanadium was developed by employing off-grade titanium sponge and iron.VLTi has following characteristicsVLTi has following characteristics.

The same mechanical properties as Ti6Al4V

The lightest alloy in conventional titanium alloys

Applicable to sports gears and automobile components insteadpp p g pof Ti6Al4V

2007.10.09TITANIUM 2007 page 16

Thank you for your attention

2007.10.09TITANIUM 2007 page 17

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