㠽ข⋵↥ᬺᛛⴚ࠮ࡦ࠲࡯‫⎇ޓ‬ⓥႎ๔ͳ  ࡌ࡯࠲ဳ࠴࠲ࡦว㊄ߩ಄㑆㎊ㅧᕈ⹜㛎Forgeability Tests on Titanium Alloy of 15V-3Al-3Sn-3Cr㊁᎑ ⾫๋࡮◉ፒ ศᄥ㇢*࡮ೋ㣮㊁ ኡ৻*࡮ᷡ᳓ ㅘ*࡮የፒ ᢥᒾ**࡮Ỉㄝ ᒄ***Kengo Nojima, Kichitaro Shinozaki, Kanichi Hatsukano, Toru Shimizu, Fumihiko Ozaki and Hiromu Sawabeࡌ࡯࠲ဳ࠴࠲ࡦว㊄㧔Ti-15V-3Al-3Sn-3Cr㧕ߩ⎬ߐ⹜㛎‫ޔ‬ᄌᒻᛶ᛫⹜㛎‫ޔ‬ᓟᣇ᛼಴ߒ⹜㛎ࠍߒߚ‫⹜ޔߚ߹ޕ‬㛎ߩടᎿᾲߦࠃࠆ᷷ᐲ਄᣹‫ߩߘޔ‬ᓟߩဳ߳ߩᾲ⒖േߦࠃࠆ಄ළߩㆊ⒟ࠍផቯߒߚ‫࠴ဳ࠲࡯ࡌޔࠅࠃࠇߎޕ‬࠲ࡦว㊄ߩ㎊ㅧᕈߦߟ޿ߡ⠨ኤߒߚ‫ޕ‬The hardness test, the flow stress test, and the back-ward extrusion test of Titanium alloy of 15V-3Al-3Sn-3Cr werecarried out. Moreover, the temperature variations of the workpiece during the forge processing were estimated by considering that the heat generation from plastic deformation and the heat transfer from the workpiece to the die assemblies.
The forgeabilities of Titanium alloy of 15V-3Al-3Sn-3Cr were considered from these examinations.

 ߪߓ߼ߦ߅޿ߡ⹜㛎೨ߦ⚂ *8 ߢ޽ߞߚ߽ߩ߇‫⹜ޔ‬㛎ᓟߦ࠴࠲ࡦ᧚ᢱߪ⥶ⓨ࡮ቝቮ‫ޔ‬᳃↢ຠ‫ޔ‬ක≮㨯⑔␩‫࡟ޔ‬ࠫࡖ࡯↪ຠߥߤ߳ߩ೑↪߇Ⴧߒ‫ޔ‬ႎ๔㨪ߪ⚂ *8 ߹ߢ⎬ൻߒߚ‫ޕ‬߽޽ࠆ߇‫ޔ‬Ǫဳ࠴࠲ࡦว㊄ߩ಄㑆㎊ㅧᕈߦߟ޿ߡ⺞ߴߚߩߢႎ๔ߔࠆ‫ޕ‬ ታ㛎᧚ᢱ⹜㛎᧚ᢱߩਥⷐൻቇᚑಽߪ⴫㧝ߩߣ߅ࠅߢ޽ࠆ‫ޕ‬⴫㧞 ᝪㄟߺ⹜㛎᧦ઙ⻉ర⹜㛎 ኸᴺ⹜㛎ㅦᐲ⹜㛎ᯏẢṖ೷ቶ᷷͠II㧝OOOKP⚂㧞OOOKPਁ⢻⹜㛎ᯏ
% /Q5ࠝ࡯࠻ࠣ࡜ࡈ
% /Q5⴫㧝 ⹜㛎᧚ᢱߩਥⷐൻቇᚑಽਥⷐൻቇᚑಽ㧔㧕
8
#N
5P
%T
6K8#N5P%T 1400

ਥⷐ⚵ᚑቶ᷷

ᾲಣℂ㧦͠Jψⓨ಄ ᄌᒻᛶ᛫౞ᩇᒻ⹜㛎 ࠍ↪޿ߡᝪㄟߺ⹜㛎ࠍߒ‫ޔ‬࿶❗ᄌᒻᛶ᛫㨪ኻᢙ߭ߕߺᦛ✢ࠍ᳞߼ߚ‫⹜ޕ‬㛎᷷ᐲߪቶ᷷෸߮ ͠ߢ޽ߞߚ‫ޕ‬㒠ફὐߪ⚂ /2C‫ ߺߕ߭ޔ‬ߦ߅޿ߡᄌᒻᛶ᛫ߪ /2C‫ࠆߌ߅ߦ͠ޔ‬ᄌᒻᛶ᛫ߪቶ᷷ߩ⚂ ߦߥߞߚ‫⹜ޕ‬㛎 ⎬ߐߪቶ᷷ߦ

ᄌᒻᛶ᛫ (MPa)

1200
250͠

1000
800
600
400
200
000.1

0.2

0.3

0.4 0.5
߭ߕߺ H࿑㧝 ᝪㄟߺ⹜㛎⚿ᨐ*⁛┙ⴕ᡽ᴺੱ↥ᬺᛛⴚ✚ว⎇ⓥᚲ **ࡅ࡯ࡂࠗࠬ࠻♖Ꮏᩣᑼળ␠ ***ర಄㑆㎊ㅧᩣᑼળ␠
̶23̶

0.6

0.70.8 ⠨ ኤࡆ࠶ࠞ࡯ࠬ⎬ߐ HV

350
325

ቶ᷷ߦ߅޿ߡǪ࠴࠲ࡦߩ⎬ߐߪ *8 ߢ޽ࠅ‫ޔ‬ห300

ߓ⎬ߐߩ὇⚛㍑ߩ⹜㛎 ࠍ↪޿ߡᢿ㕙ᷫዋ₸ 㧑275

ߩᓟᣇ᛼಴ߒࡄࡦ࠴࿶ജߪ⚂ /2C ߦ߽㆐ߔࠆ250ߣ੍᷹ߐࠇ 㧕‫࠴ࡦࡄޔ‬ᒝᐲߩ㒢⇇ࠍ⿧߃ߚ‫ޕ‬ታ㓙ߦ

225ߪടᎿߢ߈ࠆℂ↱ߪടᎿᾲߢ⹜㛎 ߇㜞᷷ߦߥࠅᄌ

200

00.2

0.40.6
߭ߕߺ H0.8ᒻᛶ᛫߇ਅ߇ࠆߚ߼ߣ੍ᗐߒߡ㎊ㅧਛߩ᷷ᐲࠍ⠨ኤ1ߒߚ‫ޕ‬಄㑆㎊ㅧຠߩ⩄㊀ߦ෸߷ߔ⚛᧚ኸᴺലᨐࠍኸ࿑㧞 ቶ᷷ߦ߅ߌࠆ⎬ߐ

ᴺߦࠃࠆ᷷ᐲߩ㆑޿ߦࠃࠆߣ੍᷹ߒߡ‫ޔ‬ή㒢౞ᩇߩᾲવዉ⸃ᨆ⚿ᨐࠍ೑↪ߒߡ᷷ᐲᄌൻࠍ⸘▚ߒߚ⎇ⓥ
㨪 ኈེߩᓟᣇ᛼಴ߒታ㛎ࠍෳ⠨ߦߒ‫ࠍ࡞࠺ࡕޔ‬ή㒢౞ᩇ߆ࠄ⃿ߦᄌᦝߒ$K ᢙࠍ⠨ᘦߒߡ᷷ᐲࠍ੍᷹ߔࠆߎߣߣߒߚ‫ޕ‬⋥ᓘ OO‫ޔ‬㜞ߐ OO ߩ౞ᩇᒻ⹜㛎 ߦ㤥㋦ߢẢṖߒߡ M0 ࠢ࡜ࡦࠢࡊ࡟ࠬࠍ↪޿ߡᓟᣇ᛼಴

 ⃿ࡕ࠺࡞ߒ⹜㛎ࠍߒߚ‫ޕ‬వ┵ᒻ⁁෸߮ᢿ㕙ᷫዋ₸߇⇣ߥࠆࡄ

ടᎿਛߩ㎊ㅧຠߩ᷷ᐲߪ࿑㧠ߦ␜ߔ᷷ᐲ⸘▚ࡕ࠺ࡦ࠴ࠍ㧞⒳↪޿ߚ‫᧦ߩߟ৻ޕ‬ઙߢߪኈེߩ਄ㇱ߇ಽ࡞ߦᓥ߁ߣ઒ቯߒߚ‫ޔߜࠊߥߔޕ‬႟ᕈᄌᒻࠛࡀ࡞ࠡ㔌⎕៊ߒߚ߇‫ޔ‬ਅㇱߪടᎿߢ߈ߚ‫ߪઁޕ‬ஜోߥടᎿ࡯ߩ 㧑߇ᾲߦߥࠅ㎊ㅧຠࠍᢿᾲ⊛ߦ᷷ᐲ਄᣹ߐ߇ߢ߈ߚ‫ޕ‬ታ㛎ᢙߪฦ㧝୘ߒ߆ߥߊ‫ޔ‬ടᎿߩᚑุߩߖߚᓟ‫ޔ‬ᾲߪടᎿᤨ㑆ਛ‫ޔ‬Ꮏౕ߳વࠊࠅૐਅߔࠆ‫ޕ‬ℂ↱ߪ․ቯߢ߈ߥ߆ߞߚ߇‫ޔ‬ቶ᷷ߦ߅ߌࠆടᎿ߇น

㎊ㅧടᎿߦ↪޿ࠄࠇࠆࡆ࡟࠶࠻ᒻ⁁ߪ⋥ᓘߣ㜞ߐ߇⢻ߢ޽ࠆߎߣߪࠊ߆ߞߚ‫ޕ‬߶߷╬ߒߊ‫ޔߚ߹ߪ޿ࠆ޽ޔ‬Ყセ⊛ߕࠎߋࠅߒߡ߅ࠅ‫ో߷߶ޔ‬㕙߇ဳߣធ⸅ߒߡ޿ࠆߩߢ⃿ᒻߢㄭૃߒ⴫㧟 ᓟᣇ᛼಴ߒടᎿ᧦ઙߚ‫⃿ޕ‬ᒻߩ㕖ቯᏱᾲવዉ⸃ᨆ⸃ߪᓧࠄࠇߡ߅ࠅ‫ߎޔ‬  ⻉రታ㛎 㧔ᄬᢌ㧕ታ㛎 㧔ᚑഞ㧕ࡄࡦ࠴ᓘIIᢿ㕙ᷫዋ₸ẢṖ೷% /Q5%
㩔㩩㩧㩋᧚⾰⿥⎬⿥⎬㩔㩩㩧㩋⴫㕙ಣℂ㧙
6K0㩔㩩㩧㩋వ┵ᒻ⁁ ࡈ࡜࠶࠻ ౞㍙㧔Dq㧕ࠇࠍ೑↪ߒ‫ޔ‬᷷ᐲߪ⃿ౝߩᐔဋ᷷ᐲߢઍ⴫ߔࠆߎߣߣߒߚ‫ߥ߁ࠃߩߎޕ‬႐วߩᎿౕ᷷ᐲ߇ᄌൻߒߥ޿ $Kᢙή㒢ᄢߩ႐วߩᾲવዉ⸃ᨆ⸃ࠍ࿑㧡ߦ‫ޔ‬Ყセߩߚ߼ή㒢ᐔ᧼෸߮ή㒢౞ᩇߩ⚿ᨐߣ౒ߦ␜ߒߚ‫ߎߎޕ‬ߦ 6‫ޔ‬6O ߪߘࠇߙࠇ⊒ᾲߦࠃࠆೋᦼߩ᷷ᐲ਄᣹㊂‫ޔ‬㎊ㅧຠߩᐔဋ᷷ᐲ‫(ޔ‬Q‫ޔ‬C‫ޔ‬㨠‫ޔ‬4 ߪߘࠇߙࠇࡈ࡯࡝
ࠛᢙ‫ޔ‬᷷ᐲવዉᐲ‫ᤨޔ‬㑆‫⃿ޔ‬ඨᓘߢ޽ࠆ‫ޕ‬㧔C㧕ታ㛎㧝㧔D㧕ታ㛎㧞࿑㧟 ടᎿᓟߩ౮⌀

̶24̶㠽ข⋵↥ᬺᛛⴚ࠮ࡦ࠲࡯‫⎇ޓ‬ⓥႎ๔ͳ  ࿑㧤ߦฦ⒳᧚ᢱࠍ↪޿ߡᢿ㕙ᷫዋ₸ 㧑ߩᓟᣇ᛼಴ߒടᎿࠍߒߚ႐วߩ⚿ᨐࠍ␜ߒߚ‫ࡦ࠲࠴ޕ‬ว㊄ߪᄌᒻᛶ᛫߇ᄢ߈ߊ‫ޔ‬ኒᐲ࡮Ყᾲ߽ዊߐ޿ߚ߼‫⊒ޔ‬ᾲᕈߪ㜞ߊ‫᧚ߩઁޔ‬ᢱߩ㧟㨪 ୚ߩ⊒ᾲ᷷ᐲߣߥߞߚ‫ޕ‬߹ߚ‫ޔ‬࿑㧤ߩ⚿ᨐ߆ࠄዊኸᴺߩ⚛᧚ߪᾲવ㆐߇ᄢኸᴺ⚛᧚ࠃࠅ߽ᄢ߈ߊ‫ޔ‬㎊ㅧຠߩ᷷ᐲߪૐߊ‫ޔ‬ടᎿ࿶ജߪ㜞޿ߎߣ߇ࠊ߆ࠆ‫ߩࡦ࠲࠴ޕ‬ടᎿ࿶ജߪ⚛᧚ᢿ
㕙Ⓧᒰࠅ⚂ 㨪/2C ߢ޽ߞߚ‫ޕ‬ᄌᒻᛶ᛫㧔MPa㧕

1200
1000

࿑㧠 ᷷ᐲ⸘▚ࡕ࠺࡞
1Bi=п

Tm / T00.8800
Steel

600
400

CuMg
Al200
000.6
ή

0.4
ή

㒢

0.2
00Ti

⃿

0.2

㒢

ᐔ᧼300

600
900
᷷ᐲ㧔͠㧕

1200

࿑㧢 ⸘▚ߦ↪޿ߚᄌᒻᛶ᛫㧔᷷ᐲଐሽᕈߩߺ⠨ᘦ㧕

౞ᩇ

0.4
0.6
2
Fo=at/R

0.8⴫㧠 ᾲ⸘▚ߦ↪޿ߚ‛ᕈ୯

1U

MIO

࿑㧡 ήᰴరൻᐔဋ᷷ᐲ

6K
5VGGN
#N
%W
/I ᷷ᐲ⸘▚႟ᕈ઀੐ߩ⸘▚  ߦᔅⷐߥᄌᒻᛶ᛫෸߮᧚ᢱ‛ᕈߪ࿑㧢෸߮⴫  ߦ␜ߒߚ୯ࠍ↪޿ߚ‫ޕ‬ᾲવ㆐ߩ⸘▚ߪ $K ࠍή㒢ᄢߣߪߖߕ‫ޔ‬ធ⸅ᾲࠦࡦ࠳ࠢ࠲ࡦࠬߪߘߩ⋥ᓘࠍࡄࡦ࠴߇ㅢㆊߔࠆᤨ㑆ߣߒߡ‫⸃ޔ‬ᨆ⸃ࠍ㐿␜ࡊࡠࠣ࡜ࡓࠦ࡯࠼ ࠍ೑↪ߒߡ⸘▚ߒߚ‫ߓߪޕ‬߼ߦቶ᷷ߦ߅ߌࠆᄌᒻᛶ᛫ࠍ೑↪ߒߡ႟ᕈ઀੐ߦࠃ

1800

᷷ᐲ (͠)

600▚⚿ᨐࠍടᎿㅦᐲߩᓇ㗀ࠍ⺞ߴࠆߚ߼‫ޔ‬ㅦᐲ⚂ OOU ߩ߶߆ ෸߮OOU ߦኻߒߡ࿑㧣ߦ␜ߒߚ‫ޕ‬ടᎿਛߦ࠴࠲ࡦߩ㎊ㅧຠߪ⚂ ͠ߦ㆐ߒߡ޿ࠆ‫ޕ‬
̶25̶

OU



I16mm, h20mm

1200߼ߚ‫ޕ‬ᰴߦᦨೋߩ⸘▚⚿ᨐߦࠃࠆ᷷ᐲߦ߅ߌࠆᄌᒻ

ߊߥࠆ߹ߢ⸘▚ࠍ➅ࠅ㄰ߒߚ‫ޕ‬Ǫ࠴࠲ࡦߦኻߔࠆ⸘

9 O-C 






50mm/s100mm/s
200mm/s

1400ࠆ᷷ᐲ਄᣹ࠍ⸘▚ߒ‫ޔ‬᷷ᐲવ㆐ߦࠃࠆ᷷ᐲૐਅࠍ᳞

ߦࠃࠆ᷷ᐲૐਅߩ⸘▚ࠍߒߚ‫ߩࠄࠇߎޕ‬᷷ᐲ߇╬ߒ





-1600

1000

ᛶ᛫ࠍ↪޿ߡ႟ᕈ઀੐ߦࠃࠆ᷷ᐲ਄᣹‫ߩ߳ဳޔ‬વ㆐

M, MI-







2000
ടᎿ࿶ജ (MPa)M9 O- ‫ޔ‬ടᎿᤨ㑆ߪ႟ᕈᄌᒻၞߪ⃿ߢ⴫ߐࠇ‫ޔ‬E

ടᎿ᧦ઙ

200mm/s
100mm/s
50mm/s

500
400
300

405060ᢿ㕙ᷫዋ₸ r࿑㧣 ࠴࠲ࡦߩ᷷ᐲ࡮࿶ജ⸘▚⚿ᨐ

70ടᎿ࿶ജ (MPa)

2000
1600

ࡅ࡯ࡂࠗࠬ࠻♖Ꮏᩣᑼળ␠ߩየፒᢥᒾ᳁ߦߪ‫ޔ‬ታ

Steel1200

᷷ᐲ (͠)

ജࠍ޿ߚߛ޿ߚ‫ޕ‬

r=65%
Ti

800

㛎⹜ᢱࠍߏឭଏ޿ߚߛ޿ߚ‫ޕ‬CuMg
Al4000600

ర಄㑆㎊ㅧᩣᑼળ␠ߩỈㄝ ᒄ᳁ߦߪ‫ޔ‬⾆㊀ߥߏഥ⸒ࠍ޿ߚߛ޿ߚ‫ޕ‬ߎߎߦ⸥ߒߡⴲᔃࠃࠅᓮ␞↳ߒ਄ߍࠆ‫ޕ‬Ti

45030015000

ᢥ ₂SteelMg
CuAl

10203040⋥ᓘ߅ࠃ߮㜞ߐ (mm)50㧕㤥Ꮉೣᄦ㧧࠲࠶ࡇࡦࠣࡈࠜ࡯ࡑ࡯ߦࠃࠆ࠴࠲ࡦᚑ
ᒻ‫ޔ‬ᣣᧄ႟ᕈടᎿቇળ㎊ㅧಽ⑼ળ ╙  ࿁㎊ㅧ

60ታോ⻠ᐳ㧔㧕࿑㧤 ฦ⒳᧚ᢱߩ᷷ᐲ෸߮࿶ജ⸘▚⚿ᨐ㧕㦖㊁ା㓉㧧⥄ォゞㇱຠߣ಄㑆㎊ㅧ࡮࡮ᦨㄭߩ⹤㗴㧔ᯏ᪾ࡊ࡟ࠬ㧕಄㎊ࡈࠔࡒ࡝࡯ળᛛⴚ⾗ᢱ 0Q㧔㧕㧕◉ፒศᄥ㇢‫ޔ‬ᳯ┵ᐙᄦ‫ޔ‬ᄢᯅ㓉ᒄ‫ޔ‬ᷡ᳓ ㅘ‫ޔ‬ ߅ࠊࠅߦ

ೋ㣮㊁ኡ৻㧧ታ↪಄㑆᛼಴ߒടᎿ⸘▚ࡊࡠࠣ࡜ࡓ

Ǫဳ࠴࠲ࡦว㊄ߪ಄㑆㎊ㅧߪน⢻ߢ޽ࠆ߇‫ޔ‬ടᎿߩ⹜૞‫  ╙ޔ‬࿁႟ᕈടᎿㅪว⻠Ṷળ㧔㧕2⊒ᾲߪ⪺ߒߊኈᤃߦ ͠ߦ߽㆐ߒ‫ޔ‬ẢṖ೷ߩ⠴ᾲ㧕*5%CTUNCY㧘,%,CGIGT㧧%QPFWEVKQPQHJGCVKPUQNKFU㧔㧕ᕈ߇㊀ⷐߣᕁࠊࠇߚ‫ߛ߹ޕ‬ታ㛎ᢙߪዋߥߊ⸘▚ߦ↪
޿ߚ‛ᕈ୯߽ㄭૃ୯ߢ޽ࠅਇቢోߢߪ޽ࠆ߇‫ޔ‬⠨߃㧕◉ፒศᄥ㇢‫ޔ‬ᷡ᳓ ㅘ‫ޔ‬Ꮏ⮮⧷᣿㧧ਣ᫔೨ᣇ᛼಴ᣇߪ㑆㆑޿ߥ޿ߣᕁࠊࠇߚߩߢႎ๔ߒߚ‫੹ޕ‬ᓟߪታߒടᎿ࿶ജߦ෸߷ߔ⚛᧚ኸᴺߩᓇ㗀ߩᾲജቇ⊛ᬌ㛎ᢙࠍჇߒߡ࠺࡯࠲ߩା㗬ᕈࠍ㜞߼ࠆߣߣ߽ߦ᷷ᐲ⸛‫  ╙ޔ‬࿁႟ᕈടᎿㅪว⻠Ṷળ 2㧔㧕㧕ਣጊ⨃↵㧧㕖ቯᏱ᷷ᐲಽᏓࠍ᳞߼ࠆ E ࡊࡠࠣ࡜ࡓ⸘▚ࡕ࠺࡞ࠍቢᚑߐߖߚ޿‫ޕ‬JVVRYYYRJQVQPVWVQM[QCELR`OCTW[COC⻢ ㄉ

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ࠫ࠲࡞߽ߩߠߊࠅ⎇ⓥ࠮ࡦ࠲࡯ߦ߅ߌࠆᛛⴚ⎇ୃߩߥ߆ߢታᣉߒߚ߽ߩߢ޽ࠆ‫ᧄޔߡߒߘޕ‬ႎ๔ߪ‫╙ޔ‬58 ࿁႟ᕈടᎿㅪว⻠Ṷળߦ߅޿ߡ⊒⴫ߒߚ߽ߩߢ޽ࠆ‫ޕ‬↥ᬺᛛⴚ✚ว⎇ⓥᚲ࡮࠺ࠫ࠲࡞߽ߩߠߊࠅ⎇ⓥ࠮
ࡦ࠲࡯ߩ◉ፒศᄥ㇢వ↢ߦߪ‫⎇ᧄޔ‬ⓥߩㆀⴕߦ޽ߚ
ࠅ‫ޔ‬ᄙᄢߥߏᜰዉࠍ޿ߚߛ޿ߚ‫ޔߚ߹ޕ‬ห࠮ࡦ࠲࡯ߩየፒᶈ৻వ↢ߦߪ‫ޔ‬ᛛⴚ⎇ୃߩฃߌ౉ࠇߦ㓙ߒߡᄙᄢߥߏዧജࠍ޿ߚߛߊߣߣ߽ߦ‫⾆ޔ‬㊀ߥߏഥ⸒ࠍ޿ߚߛ޿ߚ‫ޕ‬↥ᬺᛛⴚ✚ว⎇ⓥᚲ࡮వㅴ⵾ㅧࡊࡠ࠮ࠬ⎇ⓥㇱ㐷࡮㔍ടᎿ᧚ᚑᒻ⎇ⓥࠣ࡞࡯ࡊߩೋ㣮㊁ኡ৻వ↢߅ࠃ߮ᷡ᳓ ㅘవ↢ߦߪ‫ޔ‬ታ㛎ߩታᣉߦ㓙ߒᄙᄢߥߏද̶26̶