Report㉸ࣁ࢖ࢸࣥ TRIP 㗰ᯈࡢ㛤Ⓨ࡜ࡑࡢࣉࣞࢫᡂᙧᛶᮡᮏࠉබ୍

K. Sugimoto㸯㸬ࡣࡌࡵ࡟ ୍⯡࡟㸪ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺ㸦5$㸧ࡣᕤල㗰➼࡛ࡣ◳ࡉࡢపୗ㸪ᑍἲኚ໬࡞࡝ࡢ㈇ࡢຠᯝࢆࡶࡓࡽࡍሙྜࡀከ
ࡃ㸪౑⏝๓࡟ࢧࣈࢮࣟฎ⌮࡞࡝࡟ࡼࡗ࡚ࡑࡢయ✚⋡ࢆῶᑡࡉࡏࡿሙྜࡀከ࠸  㸬ࡇࢀ࡜ࡣ㏫࡟㸪ព㆑ⓗ࡟ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࢆከ㔞࡟ṧᏑࡉࡏ㸪ࡑࡢኚែㄏ㉳ረᛶWUDQVIRUPDWLRQ,QGXFHG3ODVWLFLW\  ࡟ࡼࡾࣉࣞࢫᡂᙧᛶࢆᨵၿࡍࡿࡇ࡜ࡀ࠶ࡿ  㸬75,3 ຠᯝࢆ᭱ࡶ᭷ຠ࡟฼⏝ࡋࡓ౛࡜ࡋ࡚㸪 ᖺ௦ᚋ༙࡟⮬ື㌴⏝㧗ᙉᗘ㗰ᯈ࡜ࡋ࡚᪂᪥ᮏ〇㕲࡟ࡼࡗ࡚㛤Ⓨࡉࢀࡓ &6L0Q ⣔పྜ㔠75,3 㗰ࡀ࠶ࡆࡽࢀࡿ  㸬ࡇࡢ &6L0Q ⣔పྜ㔠 75,3 㗰ࡣ࣏ࣜࢦࢼࣝࣇ࢙ࣛ࢖ࢺ㸦3)㸧ࢆẕ┦࡜ࡋ㸪ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺ࡜࣋࢖ࢼ࢖ࢺ ᐇ㝿࡟ࡣⅣ໬≀ࣇ࣮ࣜࡢ࣋࢖ࢼ࢖ࢺ ࡢΰྜ⤌⧊ࢆ➨  ┦࡜ࡋࡓ 」 ྜ ⤌ ⧊ 㗰 ࡛ ࠶ ࡾ  㸪 ᙜ ึ ࡣ ṧ ␃ Ț ࣁ ࢖ ࢸࣥࡲ
ࡓࡣ 75,3 ᆺ」ྜ⤌⧊㗰࡜࿧ࡤࢀࡓ㸦⾲㸯㸧㸬㏆ᖺ㸪ⴭ⪅ࡽࡢࢢ࣮ࣝࣉ࡟ࡼࡾ㸪ࣉࣞࢫᡂᙧᛶࢆࡉࡽ࡟㧗ࡵࡿࡓࡵ㸪ᚤ⣽ᆒ୍࡞ࣛࢫ≧ࡢ࣋࢖ࢽࢸ࢖ࢵࢡࣇ࢙ࣛ࢖ࢺ㸦%)㸧㸪࣐ࣝࢸࣥࢧ࢖ࢺ㸦0㸧⤌⧊ࡲࡓࡣࡇࢀࡽࡢΰྜ⤌⧊ࢆẕ┦࡜ࡋࡓ᪂ࡋ࠸ࢱ࢖ࣉࡢ &6L0Q ⣔ࡢ㉸㧗ᙉᗘ㸦㉸ࣁ࢖ࢸࣥ㸧75,3 ෭ᘏ㗰ᯈࡀ㛤Ⓨࡉࢀࡓ  㸬ᮏ✏࡛ࡣ㸪ࡇࡢ㉸ࣁ࢖ࢸࣥ TRIP 㗰ᯈࡢ⤌⧊㸪ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺ≉ᛶ㸪ᘬᙇ≉ᛶཬࡧࣉࣞࢫᡂᙧᛶ࡟ࡘ࠸࡚㸪ⴭ⪅ࡽࡢ◊✲ࢢ࣮ࣝࣉࡢ◊✲ᡂᯝࢆ୰ᚰ࡟⤂௓ࡍࡿ㸬⾲ 1 4 ✀㢮ࡢపྜ㔠 TRIP 㗰ࡢ㛤ⓎࡢṔྐ
ẕ┦⤌⧊
PFAM
BF
M

1980

1990
7'3

2000

2010

2020

ၟ ရ໬  (0.6-0.8GPa)

7$0(1.0-1.2GPa)7%)㻌
(1.5-2.0GPa)(0.8-1.0GPaၟ ရ໬ 

70

PF: polygonal ferrite, AM: annealed martensite. BF:baintic ferrite, M: martensite, TDP: TRIP ᆺ」ྜ⤌⧊㗰㸪
TAM: TRIP ᆺ↝㕌㺭㺷㺡㺻㺙㺐㺢㗰㸪TBF: TRIP ᆺ㺫㺼㺐㺤㺡㺆㺍㺖㺪㺈㺵㺐㺢㗰㸪TM: TRIP ᆺ㺭㺷㺡㺻㺙㺐㺢㗰. ( )ෆࡣᘬᙇᙉࡉ⠊ᅖ㸬㸰㸬ṧ␃Țࡢࡦࡎࡳㄏ㉳ኚែ࡜ 75,3 ຠᯝ ㉸ࣁ࢖ࢸࣥ 75,3 㗰୰࡟Ꮡᅾࡍࡿṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࡣᐊ ࡛ࡣ‽Ᏻᐃ࡛࠶ࡾ㸪ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࡢ࣐ࣝࢸࣥࢧ࢖ ࢺ㛤 ጞ ᗘ 㸦 0 6 㸧 ௨ ୖࡢ ᗘ࡛ᙎ ᛶኚ ᙧ ࡲࡓࡣረᛶኚᙧࡋࡓ࡜ࡁ㸪ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࡣኚែࢆ㛤ጞࡍࡿ㸬ࡑ ࡢ ኚ ែ ᣲ ື ࡣ ṧ ␃ ࢜ ࣮ ࢫ ࢸ ࢼ ࢖ ࢺ ୰ ࡢ Ⅳ ⣲ ⃰ ᗘ 㸪㸨ಙᕞ኱ᏛᕤᏛ㒊ᶵᲔࢩࢫࢸ࣒ᕤᏛ⛉࣭ᩍᤵ㸨ಙᕞ኱ᏛᕤᏛ㒊ᶵᲔࢩࢫࢸ࣒ᕤᏛ⛉ࠉᩍᤵࢧ࢖ࢬ㸪ᙧែࡢ࡯࠿㸪ᛂຊ≧ែ㸪ࡦࡎࡳ㏿ᗘ࡞࡝࡟ᙳ㡪ࡉࢀࡿ  㸬  ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࡢኚែᣲືࡣ㸪࣐ࣝࢸࣥࢧ࢖ࢺኚ
ែ࡜㛵㐃ࡍࡿ 0 6 㸪 0 6 Ȫ 㸪 0 G ᗘ࡜㛵ಀ࡙ࡅ࡚㸪௨ୗࡢࡼ࠺࡟ㄝ᫂ࡉࢀ࡚࠸ࡿ   ᅗ  ࡇࡇ࡛㸪 0 6 Ȫ ᗘࡣᛂຊㄏ
㉳ኚែ࠿ࡽࡦࡎࡳㄏ㉳ኚែ࡟㑄⛣ࡍࡿ ᗘ㸪 0 G ᗘࡣࡦࡎࡳࢆ௜୚ࡋ࡚ࡶ࣐ࣝࢸࣥࢧ࢖ࢺኚែࡀㄏ㉳ࡉࢀ࡞࠸⮫⏺ࡢ ᗘ࡛࠶ࡿ㸬  0 6  0 6 Ȫ 㛫㸸 ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࡢ 㝆అᛂ ຊ ௨ୖ࡟ ㈇Ⲵᛂຊࢆቑຍࡋࡓ࡜ࡁ㸪ࡍ࡛࡟Ꮡᅾࡋ࡚࠸ࡿ᰾⏕ᡂ఩⨨࡛ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࡀ࣐ࣝࢸࣥࢧ࢖ࢺ࡟ኚែࡍࡿ ᛂຊㄏ㉳ኚែ 㸬  0 6 Ȫ  0 G 㛫㸸ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࡀረᛶኚᙧࢆཷࡅࡓ࡜ࡁ㸪ࡍ࡭ࡾኚᙧ࡟ࡼࡗ࡚࣐ࣝࢸࣥࢧ࢖ࢺኚែࡢ᰾ࡀ⏕ᡂࡉࢀࡿ㸦ࡦࡎࡳㄏ㉳ኚែ㸧㸬᪂ࡓ࡞࣐ࣝࢸࣥࢧ࢖ࢺኚែࡣࡦࡎࡳㄏ㉳ࡉࢀࡓኚᙧࣂࣥࢻࡢ஺ᕪ㒊࡛⏕ࡎࡿ㸬  7 ! 0 㹢 㸸ࡦ ࡎ ࡳㄏ ㉳ ࣐ ࣝ ࢸࣥࢧ ࢖ࢺ ኚ ែࡀ⏕ ࡌ ࡞ ࠸ 㸬ᛂ ຊㄏ ㉳ ኚ ែ ࡦ ࡎࡳ ㄏ ㉳ ኚ ែ  ࡍ ࡭ࡾ ኚ ᙧ 

PFPFPFRARA MMRA
BF
BF
BF


Ms
MdMs

ᅗ  ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࡢኚែᶵᵓ࡜ኚែ ᗘ࡜ࡢ㛵
ಀ㸬0 6 㸪0 6 Ȫ 㸪0 G ᗘࡣࡑࢀࡒࢀ࣐ࣝࢸࣥࢧ࢖ࢺኚែ㛤ጞᗘ㸪ᛂຊㄏ㉳ኚែࢆ⏕ࡎࡿୖ㝈 ᗘ㸪ࡦࡎࡳㄏ㉳ኚែࢆ⏕ࡎࡿୖ㝈 ᗘࢆ♧ࡍ㸬 ࡦࡎࡳㄏ㉳ኚែࡢሙྜ㸪ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࡢᏳᐃᛶࡀᡂᙧᛶ࡟㔜せ࡞ᙳ㡪ࢆཬࡰࡍ㸬ࡑࡢኚᙧ࡟ᑐࡍࡿᏳᐃᛶࡣḟᘧࡢ 㹩 ್㸦ࡦࡎࡳㄏ㉳ኚែಀᩘ㸧࡟ࡼࡗ࡚⾲⌧ࡉࢀࡿ㸦ᅗ 㸧  㸬ORJ I Ț  ORJ I Ț  ̽ N ࣭ Ȝ  ࡇࡇ࡛㸪 I Ț 㸪 I Ț  ࡣࡑࢀࡒࢀረᛶࡦࡎࡳ Ȝ ࢆ௜୚ࡉࢀࡓ-49-ࣁ࢖ࢸࣥ 75,3 㗰ࢆࡑࢀࡒࢀ 7%) 㗰㸪7%0 㗰㸪70 㗰࡜࿧ࡪ㸬࡞࠾㸪70 㗰࡟ࡘ࠸࡚ࡣ㸪↝㕌ᚋ࡟ᐊ ࡲ࡛Ἔ෭ᚋ㸪Ⅳ⣲⃰໬ฎ⌮㸦SDUWLWLRQLQJ㸧ࢆ᪋ࡋࡓሙྜ࡜ 0 I ᗘ௨ୗ࡛➼ ኚែฎ⌮ࢆ᪋ࡋࡓሙྜ࡛㸪⤌⧊࡜≉ᛶࡀኚ໬ࡍࡿࡢ࡛㸪ࡑࢀࡒࢀࡢሙྜࢆ 7043 㗰㸪70,7 㗰࡜༊ูࡍࡿ㸬࡞࠾㸪70,7 㗰࡛ࡣ➼ ኚែฎ⌮ᚋ࡟ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺ ୰ ࡢ Ⅳ ⣲ ⃰ ᗘ ࢆ 㧗 ࡵ ࡿ ࡓ ࡵ ࡟ 㸪 Υ ௨ ୗ ࡢ ᗘ ࡛ 㸪V ⛬ᗘࡢⅣ⣲⃰໬ฎ⌮ࢆ᪋ࡍ࡜ᡂᙧᛶࡣࡉࡽ࡟Ⰻዲ
࡜࡞ࡿ㸬  ᅗ  ࡟㉸ࣁ࢖ࢸࣥ 75,3 㗰ࡢ⤌⧊ࡢ௦⾲౛ࢆ♧ࡍ㸬 ࡲࡓ㸪ᅗ  ࡟ࡑࡢ㗰ࡢṧ␃࣮࢜ࢫࢸࢼ࢖ࢺ≉ᛶࢆ♧ࡍ㸬ṧ␃Țࡢయ✚⋡ࡣ➼ ኚែ ᗘࡀ 0Vᗘ௨ୖ࡛᭱ࡶ㧗ࡃ㸪 ᗘࡀపࡃ࡞ࡿ࡟ࡘࢀ࡚ῶᑡࡍࡿ㸬୍᪉㸪ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࡢⅣ⣲⃰ᗘࡣ 0V ᗘࡼࡾ⣙ Υప࠸ Υ㏆㎶࡛➼ ኚែฎ⌮ࢆ᪋ࡋࡓ࡜ࡁ࡟ࣆ࣮ࢡࢆ♧ࡋ㸪ࡑࢀ௨ୗࡢ ᗘ࡛ࡣ኱ࡁࡃపୗࡍࡿ㸬 A3TBFMS


7emperaturefJ
150oC0.1

-k

27oC
o350 C
0.01
00.05 0.1 0.15 0.2 0.25 0.3
Hᅗ  ṧ␃ȚࡢᏳᐃᛶ㸦㹩್㸧ࡢồࡵ᪉㸬ᅗ୰ࡢ ᗘࡣኚᙧ ᗘࢆ♧ࡍ㸬ᚋࡢṧ␃࣮࢜ࢫࢸࢼ࢖ࢺయ✚⋡㸪ึᮇṧ␃࣮࢜ࢫࢸࢼ࢖ࢺయ✚⋡࡛࠶ࡿ㸬
%KDGHVKLD ࡽ  ࡣ  ᘧࢆḟᘧࡢࡼ࠺࡟⾲⌧ࡋ ࡚࠸ࡿ㸬
ORJ I Ț   I Ț   N  Ǽ * Ș ̓ Ț Ȝ   Ș̓Țࡇࡇ࡛㸪Ǽ *ࡣྠࡌ⤌ᡂࡢࣇ࢙ࣛ࢖ࢺ࡜࣮࢜ࢫࢸࢼ࢖ࢺࡢኚែࡢࡓࡵࡢ໬Ꮫ⮬⏤࢚ࢿࣝࢠ࣮ኚ໬ Ǽ * Ș ̓ Ț  
Ǽ * Ț 㸫Ǽ * Ș ̓ ࡛࠶ࡿ㸬ࡓࡔࡋ㸪ᙧ≧ኚ໬࡟㉳ᅉࡍࡿ⵳✚࢚ࢿࣝࢠ࣮ࢆ⪃៖ࡋ࡚࠸࡞࠸㸬 N  ࡣᐃᩘ࡛࠶ࡿ㸬୍⯡࡟㸪㉸ࣁ࢖ࢸࣥ 75,3 㗰ࡢ୍ᵝఙࡧ࡜඲ఙࡧࢆ኱ࡁࡃࡍࡿࡓࡵ࡟ࡣ㸪ࡃࡧࢀࢆ⏕ࡎࡿ࡯࡝ࡢ኱ࡁ࡞ረᛶࡦࡎࡳᇦ࡛ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࢆࡦࡎࡳㄏ㉳ኚែࡉࡏ㸪ࡦࡎࡳ◳໬⋡ࢆ㧗ࡵࡿ㸦ࡃࡧࢀࡢⓎ⏕ࢆຠᯝⓗ࡟㐜ࡽࡏࡿ㸧ࡇ࡜ࡀᚲせ࡛࠶ࡿ㸬ࡇࡢ⌧㇟ࡀ 75,3 ຠᯝ࡛࠶ࡿ㸬ࡇࡢࡓࡵ࡟ࡣ㸪ṧ␃ȚࡢⅣ⣲⃰ᗘࢆ㧗ࡃ㸦 0 V Ⅼࢆపࡃ㸧ࡍࡿ࠿㸪ࡑࡢࢧ࢖ࢬࢆᑠࡉࡃࡋ㸪ᐊ 㸦ኚᙧ ᗘ㸧ࢆ 0 V Ȫ Ⅼ࡜ 0 GⅬࡢ㛫࡟ࡶࡗ࡚ࡃࡿࡇ࡜ࡀᚲせ࡜࡞ࡿ㸬

TBMMfTMTimeᅗ  7%) 㗰㸪7%0 㗰㸪70 㗰ࡢ⇕ฎ⌮⥺ᅗ

(a)



M*A㸱㸬⤌⧊࡜ṧ␃Ț≉ᛶRABF ㉸ࣁ࢖ࢸࣥ 75,3 ෭ᘏ㗰ᯈࡢ⇕ฎ⌮⥺ᅗࢆᅗ  ࡟♧ࡍ㸬Țᇦ↝㕌ຍ⇕ᚋࡢ➼ ኚែ ᗘ㸦7 ,7 㸧ࢆ࣐ࣝࢸࣥࢧ࢖ࢺ
ኚែ㛤ጞ ᗘ㸦0 I 㸧㸪࣐ࣝࢸࣥࢧ࢖ࢺኚែ⤊஢ ᗘ㸦0 V 㸧ࡢୖ࡟ࡍࡿ࠿㸪ୗ࡟ࡍࡿ࠿࡟ࡼࡗ࡚⤌⧊ࡣ௨ୗࡢ  㹼 ࡢࡼ࠺࡟ኚ໬ࡍࡿ㸬ࡲࡓ㸪ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࡢయ✚⋡㸪Ᏻᐃᛶ㸦Ⅳ⣲⃰ᗘ㸪ࢧ࢖ࢬ㸪Ꮡᅾ఩⨨࡟ᙳ㡪ࡉࢀࡿ㸧(b)ࡶኚ໬ࡍࡿ  㸬㉸ࣁ࢖ࢸࣥ 75,3 㗰ࡣᇶᮏⓗ࡟ࡣࢭ࣓ࣥ0*Aࢱ࢖ࢺ㸦ȟ㸧ࣇ࣮࡛ࣜ࠶ࡿࡀ㸪➼ ኚែ ᗘࡀప࠸ሙྜ࡟ࡣࢭ࣓ࣥࢱ࢖ࢺࡶᏑᅾࡍࡿ㸬0RA T IT ӍM s  BF+RA       [TBF 㗰]     * M f ӌT IT ӌM s : BF+M+RA+(?)+ M A [TBM 㗰]   T IT ӌM f : M+RA+?+M * A   [TM 㗰]  ୖグࡢ  ࡜  ࡛ࡣ㸪ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺ┦ࡣ༢⊂࡟Ꮡᅾࡍࡿ࡜࡜ࡶ࡟㸪0 $FRQVWLWXHQW㸦0 $ ┦㸹ࡇࡢሙྜࡢᅗ  &6L0Q1E7%) 㗰 D ࡜ 70 㗰࣐ࣝࢸࣥࢧ࢖ࢺ┦ࡣ㏻ᖖࡢ࣐ࣝࢸࣥࢧ࢖ࢺ⤌⧊࡟ẚ㍑ࡋ
E ࡢᚤ⣽⤌⧊ࡢ඾ᆺ౛%)㸹࣋࢖ࢽࢸ࢕ࢵࢡࣇ࢙ࣛ࢖ࢺ㸪࡚ᚤ⣽࠿ࡘⅣ⣲⃰ᗘࡀ㧗ࡃ㸪◳㉁࡛࠶ࡿࡢ࡛ 0 ࡜ࡋ࡚ 00㸸 ࣐ ࣝ ࢸ ࣥ ࢧ ࢖ ࢺ 㸪 0 $㸸 0 $FRQVWLWXHQW㸪 5$㸸 ṧ ␃࡜༊ูࡍࡿ㸧࡜ࡋ࡚ࡶᏑᅾࡍࡿ㸬↝ධࢀᛶᨵၿඖ⣲࡛࠶
ࡿ 0Q&U0R1L ࡞࡝ࢆῧຍࡍࡿ࡜㸪ࡑࡢయ✚⋡ࡀቑຍ࣮࢜ࢫࢸࢼ࢖ࢺࡍࡿഴྥࡀ࠶ࡿ㸬 ௨ୗ࡛ࡣ㸪    ࡢ⤌⧊ࢆ᭷ࡍࡿ㉸-50-Ms

8

1.2
1.1
160.9

40.8

f J00.72

0.6

C J00

0100

200300TIT (oC)

400

0.5500UEl, TEl (%)

TS, YS (MPa)V (MPa)ᅗ  &6L0Q1E ㉸ࣁ࢖ࢸࣥ 75,3 㗰ࡢṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࡢయ✚⋡㸦I Ț  㸧࡜Ⅳ⣲⃰ᗘ㸦& Ț  㸧࡟ཬࡰࡍ➼ ኚែฎ⌮ ᗘ㸦7 ,7 㸧ࡢᙳ㡪2000

TIT=200oC 250oC
1500
300oC
350oC450oC
400oC1000
500
005101520
H (%)
ᅗ  &6L0Q1E ㉸ࣁ࢖ࢸࣥ 75,3 㗰ࡢᘬᙇኚᙧ᭤⥺ࡢ௦⾲౛㸬ᅗ୰ࡢ ᗘࡣ➼ ኚែฎ⌮
ᗘ㸦7 ,7 㸧ࢆ♧ࡍ㸬TBMTBFTM

1800
MfMs

(a)
1600

1400
TS

1200

1000

YS
800

600

400

20

(b)

15


10TEl


5UEl


00
100
200
300
400
500

TIT (oC)ᅗ  &6L0Q1E ㉸ࣁ࢖ࢸࣥ 75,3 㗰ࡢ ⪏ຊ㸦<6㸧㸪ᘬᙇᙉࡉ㸦76㸧㸪୍ᵝఙࡧ㸦8(O㸧㸪඲ఙࡧ㸦7(O㸧࡟ཬࡰࡍ➼ ኚែฎ⌮ ᗘ㸦7 ,7 㸧ࡢᙳ㡪㸬ᅗ 㸪 ࡟➼ ኚែ ᗘࢆኚ໬ࡉࡏࡓ࡜ࡁࡢ㉸ࣁ࢖ࢸࣥ 75,3 㗰ࡢኚᙧ᭤⥺࡜ᘬᙇ≉ᛶኚ໬ࢆࡑࢀࡒࢀ♧ࡍ㸬㉸ࣁ࢖ࢸࣥ 75,3 㗰࡛ࡣ㸪ࣇ࢙ࣛ࢖ࢺ࣭࣐ࣝࢸࣥࢧ࢖ࢺ
'XDOSKDVH 㗰ࡢࡼ࠺࡞㐃⥆㝆అࡀ⏕ࡌ㸪ẚ౛㝈㸪㸣⪏ຊࡣ୍⯡ࡢᵓ㐀⏝㗰࡟ẚ㍑ࡋ࡚ప࠸ഴྥࢆ♧ࡍ㸬ࡲࡓ㸪➼ ኚែ ᗘࡢ౫Ꮡᛶࡶᑠࡉ࠸㸬୍᪉㸪ረᛶኚᙧึᮇࡢࡦࡎࡳ◳໬ࡣ㢧ⴭ࡟⌧ࢀࡿ㸬ࡇࡢ⤖ᯝ࡜ࡋ࡚㸪㝆అẚࡣపࡃ࡞ࡿ㸬ᘏᛶ࡟㛵ࡋ࡚ࡣ㸪㉸ࣁ࢖ࢸࣥ 75,3 㗰ࡣ኱ࡁ࡞ᒁ㒊ఙࡧ࡜᩿㠃ῶᑡ⋡ࢆ♧ࡍ㸬ᅗ  ࡟㉸ࣁ࢖ࢸࣥ 75,3 㗰ࡢᘬᙇᙉࡉ࡜඲ఙࡧࡢ㛵ಀࢆ♧ࡍ㸬ᅗ୰࡟ࡣ㸪↝㕌ᚋ࡟ ΥࡢἜ୰࡟෭༷ᚋ㸪㹼Υ࡛ V ࡢⅣ⣲⃰໬ฎ⌮ࢆ᪋ࡋࡓ 7043 㗰ࡢ⤖ᯝࡶ♧ࡍ㸬㉸ࣁ࢖ࢸࣥ 75,3 㗰ࡣ㸪ᚑ᮶ࡢ )H& ⣔࣐ࣝࢸࣥࢧ࢖ࢺ㗰㸪࣋࢖ࢼ࢖ࢺ㗰㸪'XDO3KDVH 㗰࡟ẚ㍑ࡋ࡚ඃࢀࡓᙉᗘ࣭ఙࡧࣂࣛࣥࢫࢆ♧ࡍ㸬➼ ኚែฎ⌮ࢆ᪋ࡋࡓ70,7 㗰ࡣ 7043 㗰࡟ẚ㍑ࡋ࡚ඃࢀࡓᙉᗘ࣭ఙࡧࣂࣛࣥ
ࢫࢆ᭷ࡍࡿࡀ㸪➨  ୡ௦ࡢ $+66㸦 $GYDQFHGKLJKVWUHQJWKVWHHO㸧 ࡛ ࠶ ࡿ )H0Q$O ⣔ 7:,3 㗰 7:LQLQJ ,QGXFHG
3ODVWLFLW\6WHHO  ࡟ࡣཬࡤ࡞࠸㸬୍⯡࡟㸪పྜ㔠 75,3 㗰ࡢࡦࡎࡳ◳໬㔞ࡣ௨ୗࡢ㸱ࡘࡢ◳໬ࡢྜィ࡛⾲ࡉࢀࡿ  㸬L 㛗⠊ᅖෆ㒊ᛂຊ࡟ࡼࡿ◳໬㸸Ǽ Ȫ L Ϲ ࡦࡎࡳㄏ㉳࣐ࣝࢸࣥࢧ࢖ࢺ◳໬㸸Ǽ Ȫ P Ϻ ᯘ㌿఩◳໬㸸Ǽ Ȫ I㉸ࣁ࢖ࢸࣥ TRIP 㗰ᯈ࡛ࡣ୍ᵝఙࡧࡀ┦ᑐⓗ࡟ᑠࡉࡃ࡞ࡿࡀ㸪ࡇࢀࡣẕ┦ࡢึᮇ㌿఩ᐦᗘࡀᴟࡵ࡚㧗ࡃ㸪ኚᙧึᮇ࡟ࡦࡎࡳ◳໬⋡ࡀᛴῶࡍࡿ㸦ᅗ 6㸧ࡇ࡜࡟ຍ࠼㸪㧗࠸㛗⠊ᅖෆ㒊ᛂຊࡀⓎ⏕ࡋ࡞࠸ࡓࡵ㸪ࡦࡎࡳ◳໬⋡ࡢపୗࢆᢚไࡍࡿ⬟ຊࡀప࠸ࡓࡵ࡜⪃࠼ࡽࢀࡿ㸬25‫ ە‬IT‫ ۑ‬QP

20TEl (%)

Mf㸲㸬ᘬᙇ≉ᛶ࡜ኚᙧᶵᵓ

TBF

CJ0 (mass%)

TBM

TM
10fJ0 (vol%)










15
DP

10
50600

800

TSxTEl(GPa%)18141061000 1200 1400 1600 1800
TS (MPa)ᅗ  &6L0Q1E ㉸ࣁ࢖ࢸࣥ 75,3 㗰ࡢ ඲ ఙ ࡧ 7(O ࡜ ᘬ ᙇ ᙉ ࡉ 76 ࡢ 㛵 ಀ 㸬 '3&6L0Qࣇ ࢙ ࣛ ࢖ ࢺ ࣭ ࣐ ࣝ ࢸ ࣥ ࢧ ࢖ ࢺGXDOSKDVH 㗰㸳㸬ࣉࣞࢫᡂᙧᛶᅗ  ࡟㸪70,7 㗰ࡢࢥ࣮ࣝࢻࢫࢱࣥࣉရࡢ௦⾲౛ࢆ♧ࡍ㸬ࡲࡓ㸪ᅗ  ࡟㉸ࣁ࢖ࢸࣥ 75,3 㗰ࡢᙇฟࡋᛶ࡜ఙࡧࣇࣛࣥࢪᛶࢆ♧ࡍ㸬ᅗ  ୰࡟ࡣ㸪ᐊ ࡢἜ୰࡟෭༷ᚋ㸪㹼Υ࡛ V ࡢⅣ⣲⃰໬ฎ⌮ࢆ᪋ࡋࡓ 7043 㗰ࡢ-51-⤖ᯝࡶ♧ࡍ㸬 7%0 㗰࡜ 70 㗰ࡢఙࡧࣇࣛࣥࢪᛶࡣ 7%) 㗰ཬࡧᚑ᮶ࡢ࣐ࣝࢸࣥࢧ࢖ࢺ㗰࡟ẚ㍑ࡋ࡚ᴟࡵ࡚㧗࠸㸬ᅗ࡟ࡣ♧ࡋ࡚࠸࡞࠸ࡀ㸪᭤ࡆᛶ㸦᭱ᑠ᭤ࡆ༙ᚄ㸧ࡶඃࢀ࡚࠸ࡿ㸬(a)(b)

crack
10mmᅗ  &6L0Q1E70,7 㗰ࡢࢥ࣮ࣝࢻࢫࢱࣥࣉရ㸬 D ᙇฟࡋヨ㦂ᚋ㸪 E ✰ᗈࡆヨ㦂ᚋ㸦ᡴࡕᢤࡁ✰㸧㸬
12(a)10TSxH
=12GPammDP8୍⯡࡟㸪㉸ࣁ࢖ࢸࣥ 75,3 㗰ࡢఙࡧࣇࣛࣥࢪᛶࡣᡴࡕᢤࡁᦆയᣲື࡜ࡑࡢᚋࡢ✰ᗈࡆኚᙧ࡟ᙳ㡪ࡉࢀࡿ㸬୧⪅ࡣ୺࡟㸪ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࡢయ✚⋡࡜Ᏻᐃᛶ㸪⤌⧊ࡢࢧ࢖ࢬ࡜ᆒ୍ᛶ࡟ᙳ㡪ࡉࢀࡿ㸬7%0 㗰࡜ 70,7 㗰࡛ࡣ㌾㉁࡞࣋࢖ࢽࢸ࢕ࢵࢡࣇ࢙ࣛ࢖ࢺࡲࡓࡣ࣐ࣝࢸࣥࢧ࢖ࢺ┦࡜
0 $FRQVWLWXHQW ࡀඹ Ꮡࡍ ࡿࡓࡵ⤌⧊ࡣ ࡼࡾ ᚤ⣽࣭ᆒ ୍࡜࡞ࡿ㸬ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࡢከࡃࡣ◳㉁࣐ࣝࢸࣥࢧ࢖
ࢺ࡟ᅖࡲࢀ࡚࠸ࡿࡓࡵẚ㍑ⓗᏳᐃ࡛࠶ࡿ㸬ࡇࢀࡽࡢ≉ᚩࡀ㸪ᡴᢤࡁᦆയࢆᑠࡉࡃࡋ㸪࠿ࡘ✰ᗈࡆ᫬ࡢࡁ⿣ࡢ㐍ᒎࢆᢚไࡋࡓ㸪⤖ᯝⓗ࡟ඃࢀࡓఙࡧࣇࣛࣥࢪᛶࢆ♧ࡋࡓ࡜⪃࠼ࡽࢀࡿ㸬࡞࠾㸪7043 㗰ࡣ 70,7 㗰࡟ẚ㍑ࡋ࡚ఙࡧࣇࣛࣥࢪᛶࡣపୗࡍࡿࡀ㸪ࡇࢀࡣ୺࡟ṧ␃࣮࢜ࢫࢸࢼ࢖
ࢺయ✚⋡ࡀప࠸ࡇ࡜࡟㉳ᅉࡍࡿ࡜⪃࠼ࡽࢀࡿ㸬

TSxTEl (GPa%)O(%)

H
10‫ ە‬IT6
‫ ۑ‬QP8

4

70

(b)
60

50TSxO
DP=60GPa%40

5030

40‫ە‬
IT3020‫ ۑ‬QP10

0600 800 1000 1200 1400 1600 1800
TS (MPa)ᅗ  &6L0Q1E ㉸ࣁ࢖ࢸࣥ 75,3㗰 ࡢ D ᙇ ฟ ࡋ ᛶ + PD[ ࡜ E ఙ ࡧ ࣇ ࣛ ࣥ ࢪ ᛶ Ȣ ࡜ ᘬ ᙇᙉࡉ㸦76㸧ࡢ㛵ಀ㸬'3&6L0Q㺪㺈㺵㺐㺢̺㺭㺷㺡㺻㺙㺐㺢 GXDOSKDVH 㗰㸬100
TWIP/Aus .
80
20Mn-3Si-3Alwarm
TRIP/TWIP
60
formingNano B 40
Q&P
5-10%Mn TRIP
20
 Mar.
Si-Mn TRIP0

02040
60
80
100

fJ (vol%)ᅗ  ྛ✀㉸ࣁ࢖ࢸࣥ㗰ࡢᙉᗘ࣭ఙࡧࣂࣛࣥࢫ㸦76[7(O㸧࡜࣮࢜ࢫࢸࢼ࢖ࢺయ✚⋡㸦I Ț 㸧ࡢ㛵ಀ㏆ᖺ㸪&6L0Q ⣔పྜ㔠 75,3 㗰㸪0Q6L$O ⣔ 7:,3 㗰ࡢ௚࡟㸪*3D ௨ୖࡢᘬᙇᙉࡉ࡜ 㸣௨ୖࡢ඲ఙࡧࢆ᭷ࡍࡿ 㹼0Q ⣔ 75,3 㗰  ࡢ◊✲ࡀୡ⏺ྛᅜ࡛㐍ࡵࡽࢀ࡚࠸ࡿ㸬ᅗ  ࡟ࡇࢀࡽྛ✀㉸ࣁ࢖ࢸࣥ㗰ࡢᘬᙇᙉࡉ࡜඲ఙࡧࡢ✚㸦ᙉᗘ࣭ఙࡧࣂࣛࣥࢫ㸧ࢆẚ㍑ࡍࡿ㸬 ᅗ୰㸪4 3
㗰㸦4XHQFK 3DUWLWLRQLQJ6WHHO  ࡣ㸪7%) 㗰ࡲࡓࡣ7%0 㗰࡜ྠᵝ࡞⤌⧊ࢆ᭷ࡍࡿ㸬ࡲࡓ㸪ࢼࣀ࣋࢖ࢼ࢖ࢺ㗰㸦1DQR%DLQLWH6WHHO ࡲࡓࡣ VXSHU%DLQLWH6WHHO ࡣࢼࣀࢧ࢖ࢬࡢࣛࢫ⤌⧊ࢆ᭷ࡍࡿ㸬ᅗ  ࡼࡾ㸪ࡇࢀࡽࡢ㉸ࣁ࢖ࢸࣥ㗰ࡢᙉᗘ࣭ఙࡧࣂࣛࣥࢫࡣ࣮࢜ࢫࢸࢼ࢖ࢺయ✚⋡࡟ࡼࡗ࡚Ỵᐃࡉࢀࡿࡇ࡜ࡀࢃ࠿ࡿ㸬ᙉᗘ࣭ఙࡧࣂࣛࣥࢫࢆ㧗ࡃࡍࡿ᪉ἲ࡜ࡋ࡚ 㛫ຍᕤࡀ࠶ࡿ㸬ࡇࢀࡣ㸪ຍᕤ ᗘࢆ Υࡲ࡛㧗ࡃࡍࡿࡇ࡜࡟ࡼࡗ࡚㸪ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࡢᏳᐃᛶࢆ㧗ࡵ㸪㧗ࡦࡎࡳᇦ࡛ࡢࡦࡎࡳ◳໬⋡ࡢపୗࢆ㜵ࡄࡇ࡜ࢆ≺ࡗ࡚࠸ࡿ㸬ⴭ⪅ࡽࡢ◊✲ࢢ࣮ࣝࣉࡣ㸪ẕ┦⤌⧊ࢆ࣏ࣜࢦࢼࣝࣇ࢙ࣛ࢖ࢺ࡜ ࡋ ࡓ &6L0Q$O1E0R
75,3 ᆺ」ྜ⤌⧊㗰ࡢ Υኚᙧ࡟࠾࠸࡚㸪㹼*3Dࡀ㐩 ᡂ ࡛ ࡁ ࡿ ࡇ ࡜ ࢆ ሗ ࿌ ࡋ ࡚ ࠸ ࡿ 㸬  ࡇ ࡢ ⤖ ᯝ ࡣ 㸪 7:,3㗰㸪࠾ࡼࡧ࣮࢜ࢫࢸࢼ࢖ࢺ㗰ࣞ࣋ࣝࡢ㧗࠸ఙࡧࡀ㸪పྜ㔠 75,3 㗰࡛ࡶྍ⬟࡛࠶ࡿࡇ࡜ࢆ♧ࡋ࡚࠸ࡿ㸬

1200
ձ

ղ
1000

80
ճ
մ

600

ձ3.33x10 -5 /s
400
ղ3.33x10 -4 /sstress (MPa)max(mm)㸴㸬ࡑࡢ௚ࡢḟୡ௦㉸ࣁ࢖ࢸࣥ 7:,375,3 㗰 

ճ3.33x10 /s

200
մ3.33x10 -2 /s
00 10 20 30 40 50 60 70 80 90
strain (%)
ᅗ  &6L0Q$O1E0R ప
ྜ㔠 75,3 㗰㸦I Ț  YRO& Ț  PDVV㸧ࡢ Υ࡛ࡢᘬᙇヨ㦂⤖ᯝ㸬ᅗ୰ࡢձ㹼մࡣࡦࡎࡳ㏿ᗘ㸬-3㸵㸬࠾ࢃࡾ࡟ ᡃࡀᅜ࡛ࡣ㸪㉸ࣁ࢖ࢸࣥ 75,3 㗰ᯈࡢ࠺ࡕ㸪7%) 㗰ཬࡧ
7%0 㗰ࡢ෭ᘏ㗰ᯈࡣ᪤࡟⮬ື㌴ࡢࢩ࣮ࢺࣇ࣮࣒ࣞ㸪ࢭࣥ-52-ࢱ࣮ࣆ࣮ࣛ࡞࡝࡟㐺⏝ࡉࢀ㸪㌴యࡢ㍍㔞໬࡜⾪ᧁᏳ඲ᛶᨵၿ࡟㈉⊩ࡋ࡚࠸ࡿ㸬ࡇࢀࡽࡢ㒊ရࡣ㸪୺࡟ࢥ࣮ࣝࢻࢫࢱࣥࣉ࡟ࡼࡗ࡚ᡂᙧࡉࢀ࡚࠸ࡿࡀ㸪㉸ࣁ࢖ࢸࣥ 75,3 㗰ࡣ࣍ࢵࢺࢫࢱࣥࣉ࡟㐺⏝ࡍࡿࡇ࡜࡟ࡼࡾ㸪⾪ᧁ྾཰≉ᛶࢆ኱ᖜ࡟ᨵၿ࡛ࡁࡿྍ⬟ᛶࡀ࠶ࡿ㸬ⴭ⪅ࡣබ┈㈈ᅋἲேኳ⏣㈈ᅋࡢ◊✲⿵ຓ㸦ᖹᡂ  ᖺᗘ୍⯡◊✲㛤Ⓨຓᡂ㸧ࢆ㡬ࡁ㸪୺࡟ 㹼*3D ⣭ࡢ 70 㗰࡟ࡘ࠸࡚࣍ࢵࢺࢫࢱࣥࣉᢏ⾡ࡢ㛤Ⓨ◊✲ࢆ㛤ጞࡋ࡚࠸ࡿ㸬ᢏ⾡㛤Ⓨࡀᡂຌࡋࡓᬡ࡟ࡣ㸪࠸ࡕ᪩ࡃሗ࿌ࡋࡓ࠸㸬ㅰ ㎡  ᮏ◊✲ࡢ୍㒊ࡣබ┈㈈ᅋἲேኳ⏣㈈ᅋࡢ◊✲ຓᡂ㸦ᖹᡂ  ᖺᗘ◊✲㛤Ⓨຓᡂ $)㸧࡟ࡼࡗ࡚⾜ࢃࢀࡓ㸬ࡇࡇ࡟㸪῝ㅰ࠸ࡓࡋࡲࡍ㸬ཧ⪃ᩥ⊩ 1) Y. Watanabe, K. Sugimoto, I. Miwa and A. Nishizawa,“Distortion in Service of a 1.2C-17Cr-2.5Mo-0.8V
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