ReviewC-Si-Mn ⣔㉸㧗ᙉᗘపྜ㔠 TRIP 㗰ࡢ㐜ࢀ◚ቯ≉ᛶ࡟ཬࡰࡍȚR ≉ᛶࡢᙳ㡪໭ᲄᬛᙪ
T. Hojo㸬⥴ゝ㏆ᖺ㸪⮬ື㌴ࡢ⾪✺Ᏻ඲ᛶ࡜㌴య㍍㔞໬࡟ࡼࡿ⇞㈝ྥ
ୖࢆ┠ⓗ࡟ࣆ࣮ࣛ㢮ࡸ࣓ࣥࣂ࣮㢮㸪ࢩ࣮ࢺࣇ࣮࣒ࣞ࡟ࡣ
590㹼980MPa ⣭ࡢ㧗ᙉᗘ㗰ᯈࡀ⏝࠸ࡽࢀ࡚࠸ࡿ㸬ࡋ࠿ࡋ㸪ᑗ᮶ⓗ࡟ࡣࡇࢀࡽࡢ㒊ᮦ࡟ࡣ 980MPa ㉸⣭ࡢ㉸㧗ᙉᗘ㗰ᯈࡢ 㐺⏝ࡀண ᝿ࡉ ࢀ㸪980MPa ㉸⣭࡟࠾࠸࡚ࡶඃࢀ ࡓ ࣉࣞࢫᡂᙧᛶࢆ᭷ࡍࡿ㉸㧗ᙉᗘ㗰ᯈࡢ㛤Ⓨࡀせồࡉࢀ࡚࠸ࡿ㸬ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺ㸦Ț R 㸧ࡢኚែㄏ㉳ረᛶ㸦TRIP㸧1 㸧ࢆ᭷ຠ࡟฼⏝ࡋࡓపྜ㔠 TRIP 㗰ࡣᴟࡵ࡚ඃࢀࡓࣉࣞࢫ
ᡂᙧᛶ 2 㸧㸪 3 㸧㸪 4 㸧㸪 5 㸧㸪 6 㸧 7 㸧 ࢆ᭷ࡍࡿ㸬ࡇࡢపྜ㔠 TRIP 㗰࡜ࡋ࡚ࡣ㸪ࡇࢀࡲ࡛࡟ẕ┦⤌⧊ࢆࡑࢀࡒࢀ࣏ࣜࢦࢼࣝࣇ࢙
ࣛ࢖ࢺ㸪࣋࢖ࢽࢸ࢕ࢵࢡࣇ࢙ࣛ࢖ࢺ࠾ࡼࡧ↝㕌࣐ࣝࢸࣥࢧ࢖ࢺ࡜ࡋࡓ TRIP ᆺ」ྜ⤌⧊㗰㸦TDP 㗰㸧 2 㸧㸪 3 㸧㸪TRIPᆺ ࣋ ࢖ ࢽ ࢸ ࢕ ࢵ ࢡ ࣇ ࢙ ࣛ ࢖ ࢺ 㗰 㸦TBF 㗰 㸧 4 㸧㸪 5 㸧 ࠾ ࡼ ࡧTRIP ᆺ↝㕌࣐ࣝࢸࣥࢧ࢖ࢺ㗰㸦TAM 㗰㸧6 㸧㸪 7 㸧 ࡀ㛤 Ⓨ ࡉࢀ࡚࠸ࡿࡀ㸪980MPa ㉸⣭ࡢᘬᙇᙉࡉࡣ TBF 㗰࡛ࡢࡳᮇᚅࡀ࡛ࡁࡿ㸬ࡇࡢࡼ࠺࡞㉸㧗ᙉᗘ⠊ᅖ࡛ࡣ㸪㐜ࢀ◚ቯࡢ
Ⓨ⏕ 8 㸧㸪 9 㸧㸪 10 㸧㸪 11 㸧㸪 12 㸧 ࡀᠱᛕࡉࢀ㸪TBF 㗰࡟ࡘ࠸࡚ࡶ㐜ࢀ◚ቯ≉ᛶࢆㄪᰝࡍࡿᚲせࡀ࠶ࡿ㸬ⴭ⪅ࡽ 11 㸧ࡣࡉࡁ࡟㸪పࡦࡎࡳ㏿ᗘᘬᙇヨ㦂ἲ㸦ࡦࡎࡳ㏿ᗘ 1.110 -5 /s㸧࠾ࡼࡧ୍ᐃ Ⲵ㔜ἲ ࡟ࡼࡗ࡚ 0.4%C-TBF 㗰ࡢỈ⣲⬤໬≉ ᛶ ࠾ࡼࡧ㐜ࢀ◚ቯ≉ᛶࢆㄪᰝࡋ㸪TBF 㗰ࡣỈ⣲྾ⶶᚋࡶ኱ࡁ࡞඲ఙࡧ࡜㧗࠸㐜ࢀ◚ቯᙉᗘࢆ♧ࡍࡇ࡜㸪࠾ࡼࡧࡇࢀࡣ
Ț R ࡀ ከࡃ ࡢ Ỉ⣲ ࢆࢺࣛࢵࣉࡋ㸪ᪧ Ț⢏⏺ ࡛ࡢࡁ ⿣ ࡢ Ⓨ⏕㸪㐍ᒎࢆᢚไࡋࡓࡇ࡜࡟㉳ᅉࡋࡓࡓࡵ࡜ሗ࿌ࡋࡓ㸬TBF㗰ࡢ㐜ࢀ◚ቯ≉ᛶࡣȚ R ≉ᛶ࡟኱ࡁࡃᙳ㡪ࡉࢀࡿࡀ㸪TBF(b)(a)
1200Υ 30t
3600s
20t

㸬ᐇ㦂᪉ἲ౪ ヨ 㗰 ࡟ ࡣ 0.20C-1.50Si-1.50Mn-0.015P-0.0024S-0.039Al㸦mass%㸧ࡢ໬Ꮫ⤌ᡂࢆ᭷ࡍࡿ෭ᘏࡲࡲ㗰ᯈ㸦ᯈ
ཌ 1.2 mm㸧ࢆ⏝࠸ࡓ㸬ࡇࢀࡽࡢ㗰ᯈ࡟㸪ᅗ 㸦a㸧ࡢ᮲௳࡛ཌࡉ 30 mm ࡢࢫࣛࣈࢆཌࡉ 3.2 mm ࡲ࡛⇕㛫ᅽᘏᚋ㸪ᐊ ࡛ཌࡉ 1.2 mm ࡲ࡛෭㛫ᅽᘏࢆ᪋ࡋࡓ㸬ḟ࡟ 900 Υࡢሷᾎ୰࡛Țᇦ↝㕌ᚋ㸪250㹼350 Υ㸪0㹼10000 s ࡢ࣮࢜ࢫࢸࣥࣃ࣮ฎ⌮ࢆ᪋ࡋ㸦ᅗ 1㸦b㸧㸧㸪TBF 㗰ࢆ〇㐀ࡋࡓ㸬ࡇࡇ࡛㸪 S Ⅼࡣᘧ㸦1㸧 13 㸧 ࡟ࡼࡾồࡵࡓ㸬 S (Υ)=550-361(㸣C)-39(%Mn)-0(%Si)+30(%Al)

3.2t
600Υ
3600s

a  =3.5780+0.033C  +0.00095Mn  +0.005Al  +0.0220N Ț㸦2㸧

T A =250-350 o C
0-10000s

OQ

AC
3.2t

1.2tᅗ  ⇕ฎ⌮⥺ᅗ㸨ὠᒣᕤᴗ㧗➼ᑓ㛛Ꮫᰯࠉㅮᖌὠᒣᕤᴗ㧗➼ᑓ㛛Ꮫᰯ࣭ㅮᖌ

㸦1㸧ࡇࡇ࡛㸪㸣C㸪㸣Mn㸪㸣Si㸪㸣Al ࡣࡑࢀࡒࢀࡢྜ㔠ඖ⣲ࡢῧຍ㔞㸦mass㸣㸧࡛࠶ࡿ㸬Ț R ึᮇయ✚⋡㸦 Ț 0 㸧ࡣ Mo-KȘ⥺࡟ࡼࡗ࡚ ᐃࡉ ࢀࡓ㸦200㸧Ș㸪
㸦211㸧Ș㸪
㸦200㸧Ț㸪㸦220㸧Ț㸪㸦311㸧Țᅇᢡ㠃ࣆ࣮ࢡࡢ✚ศᙉᗘࡼࡾィ⟬ࡋࡓ 14 㸧㸬ࡲࡓ㸪Ț R ึᮇⅣ ⣲⃰ ᗘ 㸦 Ț0㸧ࡣ Cu-KȘ ⥺࡟ ࡼࡗ ࡚ ᐃ ࡋࡓ㸦200㸧Ț㸪㸦220㸧Ț㸪
㸦311㸧Țࣆ࣮ࢡゅᗘ࠿ࡽồࡵࡓ᱁Ꮚᐃᩘ a Ț 㸦 10 -1 nm㸧ࢆᘧ㸦2㸧 15 㸧 ࡟ ௦ ධ ࡋ ࡚ ồ ࡵ ࡓ 㸬

900Υ
1200s

10t
850Υ
100Υ/s㗰 ࡢ 㐜ࢀ ◚ ቯ ≉ ᛶ ࡟ཬ ࡰ ࡍ Ț R ≉ ᛶ ࡢ ᙳ 㡪 ࢆ ㄪᰝ ࡋ ࡓ ሗ࿌ࡣ࡞࠸㸬ࡑࡇ࡛ᮏ◊✲࡛ࡣ㸪0.2%C-1.5%Si-1.5%Mn ࡢ໬Ꮫ⤌ᡂࢆ᭷ࡍࡿ㗰ᯈ࡟Țᇦ↝㕌࡜࣮࢜ࢫࢸࣥࣃ࣮ฎ⌮ ᗘ࠾ࡼࡧ࣮࢜ࢫࢸࣥࣃ࣮ฎ⌮᫬㛫ࢆኚ໬ࡉࡏࡓ⇕ฎ⌮ࢆ᪋ࡋ࡚Ț R ≉ᛶࡢ኱ࡁࡃ␗࡞ࡿ㉸㧗ᙉᗘ TBF 㗰ࢆస〇ࡋ㸪㉸㧗ᙉ ᗘ TBF 㗰 ࡢ Ỉ ⣲ ྾ⶶ≉ ᛶ ࠾ ࡼ ࡧ㐜 ࢀ ◚ ቯ ≉ ᛶࢆ ㄪ ᰝࡋࡓ㸬ࡲࡓ㸪ࡇࢀࡽ≉ᛶ࡜㔠ᒓᏛⓗ⤌⧊ᅉᏊ࡜ࡢ㛵ಀࢆ᳨ウࡋࡓ㸬ࡓ ࡔ ࡋ㸪 Mn Ț 㸪Al Ț 㸪 N Ț ࡣ Ț R ୰ ࡢ ࡑ ࢀ ࡒ ࢀ ࡢඖ ⣲⃰ ᗘ㸦mass%㸧࡛࠶ࡿ㸬ᮏ◊✲࡛ࡣ౽ᐅୖ㸪ῧຍ㔞ࢆ⏝࠸ࡓ㸬ᘬᙇヨ㦂࡟ࡣᅽᘏ᪉ྥ࡟ᖹ⾜࡟ษࡾฟࡋࡓ JIS14B ྕヨ㦂∦㸦ࢤ࣮ࢪ㛗ࡉ 15 mm㸪ᖜ 6 mm㸪ཌࡉ 1.2 mm㸧ࢆ⏝࠸㸪ヨ㦂 ᗘ 25 Υ㸪ࢡࣟࢫ࣊ࢵࢻ㏿ᗘ 1 mm/min㸦ࡦࡎࡳ㏿ᗘ 8.310 -4 /s㸧࡛ヨ㦂ࢆ⾜ࡗࡓ㸬Ỉ⣲ࢳ࣮ࣕࢪࡣ㝜ᴟࢳ࣮ࣕࢪἲ㸦㝜ᴟ㸸ⓑ㔠㸧16 㸧 ࡟ ࡼࡾ⾜ࡗࡓ㸬ࢳ࣮ࣕࢪᾎࡢ⤌ᡂ࠾ࡼࡧ྾ⶶ᮲௳ࢆ⾲  ࡟♧ࡍ㸬ࢳ࣮ࣕࢪᚋࡢ඲྾ⶶỈ⣲㔞ࡣ㸪Ỉ⣲ࢆ୙άᛶ࢞ࢫ୰㸫࢖ࣥࣃࣝࢫຍ⇕⁐⼥ἲ࡟ࡼࡾᢳฟࡋ㸪࣒࢝ࣛ࡟ࡼࡿศ

-25-㸬ᐇ㦂⤖ᯝᚤ⣽⤌⧊࡜ᘬᙇ≉ᛶᅗ  ࡟ TBF 㗰ࡢ⇕ฎ⌮ᚋࡢ⤌⧊ࡢ SEM ෗┿㸦ࢼ࢖ࢱ࣮ࣝ⭉㣗㸧ࢆ♧ࡍ㸬࠸ࡎࢀࡢ TBF 㗰ࡶ  S Ⅼ௨ୗ࡛࣮࢜
ࢫࢸࣥࣃ࣮ฎ⌮ࡉࢀ࡚࠸ࡿࡓࡵ㸪ẕ┦⤌⧊ࡣᇶᮏⓗ࡟ࡣ⾲  Ỉ⣲྾ⶶ᮲௳
Chargesolution
Current
density

H 2 SO 4 0.5mol/L
KSCN 0.01mol/L
500A/m 2⾲  TBF 㗰ࡢᘬᙇ≉ᛶ࠾ࡼࡧȚ R ≉ᛶ
A

A





Ț 0

Ț0-0
10
100
1000
10000
10100
1000
10000
10100
1000
10000

1277
1237
1192
1232
1241
1172
1125
1179
1248
1075
1147
1132
1084

1565
1537
1511
1457
1445
1534
1473
1380
1405
1412
1362
1323
1222

13.9
14.9
15.7
16.2
13.5
15.1
16.9
15.7
15.0
10.1
15.2
13.9
15.2

2.8
3.5
3.9
3.3
2.3
3.8
3.5
2.4
1.54.2
3.5
2.6
2.1

0.55
0.27
0.46
0.64
0.68
0.61
0.56
0.84
0.63
0.67
0.95
1.00
1.01

250

300

350



㌿఩ᐦᗘࡀᴟࡵ࡚㧗࠸࣋࢖ࢽࢸ࢕ࢵࢡࣇ࢙ࣛ࢖ࢺ㸦Ș bf 㸧ࣛࢫ࡜࣐ࣝࢸࣥࢧ࢖ࢺ㸦Ș m 㸧ࣛࢫ࠿ࡽ࡞ࡾ㸪Ț R ࡣࡑࢀࡽࡢࣛࢫቃ⏺࡟ἢࡗ࡚ࣇ࢕࣒ࣝ≧࡟Ꮡᅾࡋ࡚࠸ࡿ㸬࣮࢜ࢫࢸࣥࣃ࣮ฎ⌮ ᗘࡢ㐪࠸࡟ࡼࡿᚤ⣽⤌⧊ࡢ኱ࡁ࡞ᕪࡣࡳࡽࢀ࡞࠸ࡀ㸪࣮࢜ࢫࢸࣥࣃ࣮ฎ⌮᫬㛫ࡀ㛗ࡃ࡞ࡿ࡟ࡋ
ࡓࡀࡗ࡚ࣛࢫẕ┦ࡣⱝᖸ⢒኱໬ࡋࡓࡼ࠺࡟ࡳࡽࢀࡿ㸬⾲  ࡟ TBF 㗰ࡢ⇕ฎ⌮ᚋࡢᘬᙇ≉ᛶ࠾ࡼࡧȚ R ≉ᛶࢆ♧ࡍ㸬TBF 㗰ࡢȚ R ึᮇయ✚⋡㸦 Ț 0 㸧ࡣ 1.5㹼4.2 vol%ࡢ⠊ᅖ࡟࠶ࡾ㸪ࡑࡢึᮇⅣ⣲⃰ᗘ㸦 Ț 0 㸧ࡣ 0.27㹼1.01 mass%ࡢ⠊ᅖ࡟࠶ࡿ㸬࣮࢜ࢫࢸࣥࣃ࣮ฎ⌮ ᗘ㸦 A 㸧ࡀ㧗ࡃ࡞ࡿ࡜  Ț 0 㸪 Ț 0 ࡜ࡶୖ᪼ࡋ㸪࣮࢜ࢫࢸࣥࣃ࣮ฎ⌮᫬㛫㸦 A 㸧ࡀ㛗ࡃ࡞ࡿ࡜  Ț 0 ࡣపୗࡋ㸪 Ț 0 ࡣୖ᪼ࡍࡿഴྥࡀ࠶ࡿ㸬
TBF 㗰ࡢᘬᙇᙉࡉ㸦㸧ࡣ 1222㹼1565 MPa ࡢ⠊ᅖ࡟࠶ࡿ㸬ࡲࡓ㸪඲ఙࡧ㸦㸧ࡣ 10.1㹼16.9 %ࡢ⠊ᅖ࡟࠶ࡿ㸬Ỉ⣲྾ⶶ≉ᛶᅗ  ࡟ TBF 㗰ࡢ඲྾ⶶỈ⣲㔞㸦 T 㸧࡜ᘬᙇᙉࡉ㸦㸧ࡢ㛵ಀࢆ♧ࡍ㸬TBF 㗰ࡣ㸪ᘬᙇᙉࡉࡀୖ᪼ࡍࡿ࡟ࡋࡓࡀࡗ࡚඲྾ⶶỈ⣲㔞ࡣቑຍࡍࡿഴྥࡀㄆࡵࡽࢀࡿ㸬᪼ ⬺ 㞳 ศ ᯒ ἲ ࡟ ࡼ ࡗ ࡚ ᐃ ࡋ ࡓ ᐊ ࠿ ࡽ 300 Υ ࡲ࡛ࡢ⠊ᅖࡢỈ⣲ᨺฟ᭤⥺ࢆᅗ  ࡟♧ࡍ㸬࠸ࡎࢀࡢ TBF 㗰ࡶ 50 Υ࠿ࡽ 200 Υ௜㏆࡛ከࡃࡢỈ⣲ࢆᨺฟࡋ࡚࠸ࡿ㸬 A =350 Υ㸪 A 㸻10 s ࡢ TBF 㗰ࡣ௚ࡢ TBF 㗰࡜ẚ㍑ࡋ࡚
Ỉ⣲ᨺฟࡢࣆ࣮ࢡࡀ㧗ࡃ㸪ࣆ࣮ࢡ ᗘࡣ㧗 ഃ࡟ࢩࣇࢺࡋ࡚࠸ࡿ㸬㐜ࢀ◚ቯᙉᗘᅗ  ࡟᭤ࡆᛂຊ㸦 Ȫ A 㸧࡜◚᩿᫬㛫㸦 f 㸧᭤⥺ࡢ௦⾲౛ࢆ♧ࡍ㸬ࡲࡓ㸪TBF 㗰ࡢ㐜ࢀ◚ቯᙉᗘ㸦㸧ࢆᘬᙇᙉ
 7$ Υ+7 SSP㞳ᚋ㸪⇕ఏᑟᗘἲ࡟ࡼࡾᐃ㔞ࡋࡓ㸬ࡲࡓ㸪ᣑᩓᛶỈ⣲㔞ࡣ᪼ ⬺㞳ἲࢆ⏝࠸࡚ ᐃࡋࡓ㸬࡞࠾㸪඲྾ⶶỈ⣲㔞ᐃ࠾ࡼࡧᣑᩓᛶỈ⣲㔞 ᐃࡢ㝿࡟ࡣỈ⣲ࢳ࣮ࣕࢪ࠿ࡽỈ⣲㔞 ᐃࡲ࡛ࡢ㛫㸪ヨᩱ࠿ࡽࡢỈ⣲ࡢᨺฟࢆ㜵ࡄࡓࡵ㸪ヨᩱࢆᾮయ❅⣲୰࡛ಖᏑࡋࡓ㸬㐜ࢀ◚ቯヨ㦂ࡣỈ⣲ࢳ࣮ࣕࢪ 4 Ⅼ᭤ࡆヨ㦂 16 㸧 ࡟ࡼࡾ⾜ࡗࡓ㸬ヨ㦂࡟ࡣ㛗ࡉ 65 mm㸪ᖜ 10 mm㸪ᯈཌ 1.2 mm
ࡢ㛗᪉ᙧヨ㦂∦ࢆ⏝࠸㸪ヨ㦂 ᗘࡣ 25 Υ࡜ࡋࡓ㸬㐜ࢀ◚ቯ≉ᛶࡢホ౯ࡣ㸪5 ᫬㛫◚᩿ࡋ࡞࠸᭱኱ࡢᛂຊࢆ㐜ࢀ◚ቯᙉᗘ㸦㸧࡜ࡋ࡚ホ౯ࡋࡓ㸬

7$ Υ

7$ Υ A (Υ): austempering temperature,  A (s):austempering time,  (MPa): yield stress or 0.2%
offset proof stress,  (MPa): tensile strength, (%): total elongation,  Ț 0 (vol%): volume fractionof Ț R , Ț 0 (mass%): carbon concentration of Ț R(a)




76 03Dᅗ  TBF 㗰ࡢ඲྾ⶶỈ⣲㔞 ( T ) ࡜ᘬᙇᙉࡉ () ࡢ㛵ಀ(c)(b)

10mᅗ  (a)  A =250 Υ10 s, (b)  A =350 Υ10 s ࠾ࡼࡧ(c)  A =350 Υ10000 s ࡢ࣮࢜ࢫࢸࣥࣃ࣮ฎ⌮ࢆ᪋ࡋࡓ TBF㗰ࡢᚤ⣽⤌⧊෗┿-26-ࡉ㸦㸧࡛ᩚ⌮ࡋ࡚ᅗ  ࡟♧ࡍ㸬TBF 㗰ࡢ㐜ࢀ◚ቯᙉᗘࡣ㸪ᘬᙇᙉࡉࡀ㧗ࡃ࡞ࡿ࡟ࡋࡓࡀࡗ࡚పୗࡍࡿഴྥࡀࡳࡽࢀ㸪Ӎ1400 MPa ࡢ⠊ᅖ࡛㢧ⴭ࡜࡞ࡿ㸬
TBF 㗰 ࡢ㐜 ࢀ◚ ቯ ヨ㦂ᚋࡢ ◚㠃࠾ࡼࡧ ⦪᩿㠃ࡢ SEM෗┿ࡢ௦⾲౛ࢆᅗ  ࡟♧ࡍ㸬 A =250 Υ㸪 A =10 s ࡢ TBF㗰ࡣ⢏⏺◚ቯࢆ♧ࡋ㸪ࡁ⿣ࡣ⤖ᬗ⢏⏺ࢆ㐍ᒎࡍࡿ㸬୍᪉㸪
 A =350 Υ㸪 A =10 s ࠾ࡼࡧ  A =10000 s ࡢ TBF 㗰ࡣ⢏⏺◚ቯࡀᢚไࡉࢀ㸪ᨃ࡬ࡁ㛤◚ቯࢆ♧ࡍ㸬

G+GW SSPPLQ

7$ ΥW$ V7$ Υ
W$ V


7$ Υ
W$ V7 Υᅗ  TBF 㗰ࡢỈ⣲ᨺฟ᭤⥺

Ȫ$ 03D Ỉ⣲྾ⶶ≉ᛶ࡟ཬࡰࡍȚ 5 ≉ᛶࡢᙳ㡪୍⯡࡟㸪㗰୰࡟౵ධࡋࡓỈ⣲ࡣⅣ໬≀ 16 㸧㸪 17 㸧㸪᱁ᏊḞ
㝗 9 㸧㸪⤖ᬗ⢏⏺ 17 㸧㸪ࣛࢫቃ⏺ 18 㸧 ࡸ㌿఩ 19 㸧 ࡞࡝࡟ࢺࣛࢵࣉࡉࢀࡿ㸬㧗ᙉᗘ㗰ᯈࡣ㸪Ⅳ໬≀ࡢᯒฟ㸪ẕ┦ࡢ㌿఩ᐦᗘࡢୖ᪼ࡸ⤖ᬗ⢏ᚤ⣽໬࡟ࡼࡗ࡚ࡑࡢᙉᗘࡀᚓࡽࢀࡿࡓࡵ㸪ᙉᗘࣞ࣋ࣝࡀୖ᪼ࡍࡿ࡟ࡋࡓࡀࡗ࡚྾ⶶࡍࡿỈ⣲㔞ࡣቑຍࡍࡿ㸬ࡋ࠿ࡋ㸪TBF 㗰ࡢ࣋࢖ࢽࢸ࢕ࢵࢡࣇ࢙ࣛ࢖
ࢺẕ┦࡟ࡣⅣ໬≀ࡣᏑᅾࡋ࡞࠸㸬ࡲࡓ㸪࣮࢜ࢫࢸࣥࣃ࣮
ฎ⌮᮲௳࡟ࡼࡗ࡚㸪ᚤ⣽⤌⧊࡟኱ࡁ࡞ᕪࡣࡳࡽࢀ࡞࠸㸦ᅗ
2㸧㸬ᮏ TBF 㗰ࡣ㸪࣋࢖ࢽࢸ࢕ࢵࢡࣇ࢙ࣛ࢖ࢺࣛࢫቃ⏺࡟
1.5㹼4.2 vol㸣ࡢȚ R ࡀᏑᅾࡋ࡚࠸ࡿ㸬ᳺ㔝ࡽ 9 㸧 ࡣ㸪Ț Rࡣࣇ࢙ࣛ࢖ࢺ࡞࡝࡜ẚ㍑ࡋ࡚ከ㔞ࡢỈ⣲ࢆ྾ⶶࡍࡿࡇ࡜ࢆሗ࿌ࡋ࡚࠸ࡿ㸬ࡇࢀࡣ㸪fcc ᵓ㐀ࡢȚ R ࡣ bcc ᵓ㐀ࡢࣇ࢙ࣛ࢖ࢺࡼࡾࡶ⤖ᬗ᱁Ꮚࡢ㝽㛫ࡀ኱ࡁ࠸ࡇ࡜࡟ࡼࡿ࡜⪃࠼ࡽࢀࡿ㸬ࡉࡽ࡟㸪Chan ࡽ 20 㸧 ࡣȚ R ࢆྵࡴ࣐ࣝࢸࣥࢧ࢖ࢺ㗰࡜ྵࡲ࡞࠸࣐ࣝࢸࣥࢧ࢖ࢺ㗰࡟Ỉ⣲ࢳ࣮ࣕࢪࡍࡿ࡜㸪Ț R ࢆྵࡴ࣐ࣝࢸࣥࢧ࢖ࢺ㗰ࡣྵࡲ࡞࠸࣐ࣝࢸࣥࢧ

7$ ΥW$ V
7$ ΥW$ V 7$ Υ

7$ Υ

7$ ΥW$ V

WI V


76 03Dᅗ  TBF 㗰ࡢ㐜ࢀ◚ቯᙉࡉ ()࡜ᘬᙇᙉࡉ ()ࡢ㛵ಀᅗ  TBF 㗰ࡢ㐜ࢀ◚ቯ᭤⥺D 

7$ Υ')/ 03D㸬⪃ᐹE F ȣP
G H I ȣPᅗ    A =250 Υ10 s (a and d) 㸪 A =350 Υ10 s (b and e) ࠾ࡼࡧ  A =350 Υ10000 s (c and f) ࢆ᪋ࡋࡓTBF 㗰ࡢ◚㠃 (a, b and c) ࠾ࡼࡧ◚㠃㏆ഐࡢ⦪᩿㠃 (d, e and f) ࡢ㟁Ꮚ㢧ᚤ㙾෗┿-27-ࡍ㸬ࡲࡓ㸪ᅗ  ࡟ TBF 㗰ࡢ㐜ࢀ◚ቯᙉᗘ㸦㸧ࢆȚ RึᮇⅣ⣲⃰ᗘ㸦 Ț 0 㸧࡛ᩚ⌮ࡋ࡚♧ࡍ㸬ᅗ 9 ࡼࡾ㸪࠸ࡎࢀࡢ TBF 㗰ࡶ㈇Ⲵᛂຊࡀ㧗ࡃ࡞ࡿ࡟ࡋࡓࡀࡗ࡚Ț R య✚⋡ ࡣ పୗ ࡋ ࡓ ࡇ ࡜ ࡀࢃ ࠿ ࡿ 㸬 ࡋ ࠿ࡋ 㸪 Ț R ึᮇ Ⅳ⣲ ⃰ ᗘ
ࡢẚ㍑ⓗ㧗࠸ TBF 㗰ࡣỈ⣲྾ⶶ࡟ࡼࡿȚ R ࡢ࣐ࣝࢸࣥࢧ࢖ ࢺ ኚែ ࡣᢚ ไ ࡉ ࢀ㸪 㐜 ࢀ ◚ ቯ ヨ㦂 ࡟ ࡼ ࡿ Ț R ࡢ య ✚ ⋡ప ୗ ࡶ ᑠ ࡉ ࠸ 㸬 ࡉ ࡽ ࡟ 㸪 TBF 㗰 ࡢ 㐜 ࢀ ◚ ቯ ᙉ ᗘ ࡣ 㸪 Ț RึᮇⅣ⣲⃰ᗘ࡜ṇࡢ┦㛵ࡀࡳࡽࢀࡿ㸦ᅗ 10㸧㸬ࡇࡢ⤖ᯝࡣ㸪TBF 㗰ࡢ㐜ࢀ◚ቯᙉᗘࡀȚ R ࡢᏳᐃᛶ࡟኱ࡁࡃᙳ㡪ࢆཷࡅࡿࡇ࡜ࢆ♧၀ࡍࡿ㸬㉸㧗ᙉᗘపྜ㔠 TRIP 㗰ࡢ㐜ࢀ◚ቯ≉ᛶ࡜Ț R ࡢᏳᐃᛶࡢ㛵ಀࡣ㸪ᅗ  ࡟♧ࡍ࣐ࣝࢸࣥࢧ࢖ࢺኚែࡢ࣓࢝ࢽࢬ࣒࡜⮬⏤࢚ࢿࣝࢠ࣮ࡢኚ໬ࡢᶍ
ᘧᅗ 21 㸧 ࠿ࡽ௨ୗࡢࡼ࠺࡟ㄝ᫂ࡍࡿࡇ࡜ࡀ࡛ࡁࡿ㸬Ț R ึᮇⅣ⣲⃰ᗘࡢప࠸㸪 A =250 Υ㸪 A =10 s ࡢ TBF㗰ࡣ㸪ᘧ㸦1㸧ࡼࡾồࡵࡓȚ R ࡢ  S Ⅼࡀ  A =350 Υ㸪 A =10s ࡢ TBF 㗰ࡼࡾࡶ㧗࠸㸬࠸ࡎࢀࡢ TBF 㗰ࡶ㸪Ỉ⣲ࢆ྾ⶶࡍ ࡿ ࡜Ț R ࡣ ୙ Ᏻ ᐃ࡜ ࡞ ࡾ 㸪 ࢜ ࣮ࢫ ࢸ ࢼ ࢖ ࢺ ࡢ⮬⏤ ࢚ ࢿࣝ ࢠ ࣮ ࡣ ୖ ᪼ ࡋ ࡚  S Ⅼ ࡣ ୖ ᪼ ࡍ ࡿ 㸦 ᅗ 1 1 ( b ) 㸧㸬
 A =250 Υ㸪 A =10 s ࡢ TBF 㗰ࡣ㸪Ț R ࡀ㠀ᖖ࡟୙Ᏻᐃ࡜
࡞ࡾ㸪Ỉ⣲྾ⶶࡸ㈇Ⲵ࡟ࡼࡗ࡚࣐ࣝࢸࣥࢧ࢖ࢺኚែࡋࡸࡍࡃ࡞ࡿ㸦Ỉ⣲㸩ᛂຊㄏ㉳࣐ࣝࢸࣥࢧ࢖ࢺኚែ㸧㸬୍᪉㸪 A =350 Υ㸪 A =10 s ࡢ TBF 㗰ࡣ㸪Ț R ࡢᏳᐃᛶࡀẚ㍑ⓗ㧗࠸ࡓࡵ㸪Ỉ⣲࡟ࡼࡗ࡚ S Ⅼࡣⱝᖸୖ᪼ࡍࡿࡀ㸪 A =250 Υ㸪 A =10 s ࡢ TBF 㗰ࡼࡾࡶప࠸  S Ⅼࢆ⥔ᣢࡍࡿ ࡜ ⪃࠼ ࡽ ࢀ ࡿ 㸬 ࡑࡢ ࡓ ࡵ 㸪 㧗 Ț R ึ ᮇ Ⅳ ⣲ ⃰ᗘ ࢆ ᭷ ࡍࡿ TBF 㗰 ࡢ 㐜 ࢀ◚ ቯ ヨ 㦂 ୰ ࡢỈ ⣲ ࠾ ࡼ ࡧ ᛂຊ ㄏ ㉳࣐ ࣝ 㐜ࢀ◚ቯ≉ᛶ࡟ཬࡰࡍȚ 5 ≉ᛶࡢᙳ㡪
7$ ΥW $ V
&Ț PDVV

7$ ΥW $ V&Ț PDVV    Ȫ$<6ᅗ  TBF 㗰ࡢ㈇Ⲵᛂຊ㸭㝆అᛂຊẚ ( Ȫ A ) ࡜ṧ␃࣮࢜ࢫࢸࢼ࢖ࢺయ✚⋡ẚ ( Ț / Ț 0 ) ࡢ㛵ಀ
7$ Υ
7$ Υ
7$ Υ
&Ț PDVVᅗ  TBF 㗰ࡢ඲྾ⶶỈ⣲㔞 ( T ) ࡜ṧ␃࣮࢜ࢫࢸࢼ
࢖ࢺึᮇయ✚⋡ ( Ț 0 ) ࡢ㛵ಀ+7 SSP
7$ Υ
7$ Υ

7$ Υ

I
YRO
Țᅗ  TBF 㗰ࡢ඲྾ⶶỈ⣲㔞 ( T ) ࡜ṧ␃࣮࢜ࢫࢸ ࢼ࢖ࢺึᮇయ✚⋡ ( Ț 0 ) ࡢ㛵ಀ')/ 03D࣮࢜ࢫࢸࢼ࢖ࢺ⣔ࢫࢸࣥࣞࢫ㗰ࡣ㸪௚ࡢࣇ࢙ࣛ࢖ࢺ⣔ࡸ࣐ࣝࢸࣥࢧ࢖ࢺ⣔ࢫࢸࣥࣞࢫ㗰࡜ẚ㍑ࡋ࡚㧗࠸⪏㐜ࢀ◚ቯ≉ᛶࢆ᭷ࡋ࡚࠸ࡿ㸬 ࡋ࠿ࡋ㸪Ỉ⣲ࢆ྾ⶶࡍࡿ࡜ȚࡢᏳᐃᛶࡣపୗࡋ࡚࣐ࣝࢸࣥࢧ࢖ࢺኚែࡋࡸࡍࡃ࡞ࡾ㸦Ỉ⣲ㄏ㉳࣐ࣝࢸࣥࢧ࢖ࢺኚែ㸧㸪㐜ࢀ◚ቯࡀⓎ⏕ࡋࡸࡍࡃ࡞ࡿ㸬ᮏ TBF 㗰࡟࠾࠸࡚ࡶ㸪㗰୰࡟ 1.5㹼4.2 vol㸣ࡢȚ R ึᮇయ ✚⋡ࢆ ᭷ ࡋ ࡚ ࠸ࡿ㸬ࡇࡢȚ R ࡣከ ࡃࡢ Ỉ⣲ࢆ ྾ ⶶ ࡍࡿࡇ࡜ࡀ࡛ࡁࡿࡀ㸪ࡑࡢỈ⣲࡟ㄏ㉳ࡉࢀ࡚࣐ࣝࢸࣥࢧ࢖ࢺኚែࡍࡿ࡜㸪Ț࠿ࡽᨺฟࡉࢀ࡚࣐ࣝࢸࣥࢧ࢖ࢺ࡟ᅛ⁐ࡋࡁࢀ࡞࠿ࡗࡓỈ⣲ࡣᪧȚ⢏⏺࡞࡝࡟ࢺࣛࢵࣉࡉࢀ㸪ᪧȚ⢏⏺࠿ࡽࡁ⿣ࡀⓎ⏕࣭㐍ᒎࡋ࡚㐜ࢀ◚ቯᙉᗘࢆపୗࡉࡏࡿ࡜⪃࠼ࡽࢀࡿ㸬ࡑࡇ࡛㸪௦⾲ⓗ࡞ TBF 㗰ࡢྛ㈇Ⲵᛂຊ࡛ࡢ㐜ࢀ◚ቯヨ㦂๓ᚋࡢȚ R య✚⋡ࡢኚ໬ࢆᅗ  ࡟♧ IȚIȚ࢖ࢺ㗰ࡼࡾࡶከࡃࡢỈ⣲ࢆ྾ⶶࡍࡿࡇ࡜㸪࠾ࡼࡧࡇࢀࡣከ 㔞 ࡢ Ỉ ⣲ ࡀ Ț R㸭 ࣐ ࣝ ࢸ ࣥ ࢧ ࢖ ࢺ ⏺ 㠃 ࡟ ࢺ ࣛ ࢵ ࣉ ࡋ ࡓࡓࡵ࡜ሗ࿌ࡋ࡚࠸ࡿ㸬ᅗ  ࡟ TBF 㗰ࡢȚ R ึᮇయ✚⋡㸦 Ț 0 㸧࡜඲྾ⶶỈ⣲㔞㸦 T 㸧ࡢ㛵ಀࢆ♧ࡍ㸬TBF 㗰ࡢ඲྾ ⶶỈ⣲ 㔞 ࡣ Ț R ึᮇ య✚⋡ ࡀ㧗ࡃ࡞ࡿ࡟ࡋࡓࡀ ࡗ ࡚ ቑຍࡋࡓ㸬ࡉࡁࡢ◊✲ 11 㸧㸪 12 㸧 ࡟࠾࠸࡚ࡶ㸪㉸㧗ᙉᗘప ྜ 㔠TRIP 㗰ࡢ඲྾ⶶỈ⣲㔞ࡣȚ R ึᮇయ✚⋡࡜ṇࡢ┦㛵ࡀ࠶ࡿࡇ࡜ࡀሗ࿌ࡉࢀ࡚࠾ࡾ㸪ᮏ◊✲࡛ࡶྠᵝࡢ⤖ᯝࢆ♧ࡋ࡚࠸ࡿ㸬ᮏ◊✲࡛ࡣ㸪࣮࢜ࢫࢸࣥࣃ࣮ฎ⌮᮲௳ࡢ㐪࠸࡟ࡼࡗ࡚Ỉ⣲ᨺฟ᭤⥺ࡀኚ໬ࡋࡓ㸬ࡍ࡞ࢃࡕ㸪 A =350 Υ㸪 A 㸻10s ࡢ TBF 㗰ࡣ௚ࡢ TBF 㗰࡜ẚ㍑ࡋ࡚Ỉ⣲ᨺฟࡢࣆ࣮ࢡࡀ㧗ࡃ㸪࡜ࡃ࡟㧗 ഃ࡛ከࡃࡢỈ⣲ࢆᨺฟࡋ࡚࠸ࡿ㸬ᳺ㔝
ࡽ 9 㸧 ࡟ࡼࡿ࡜㸪᪼ ㏿ᗘ 1.67 Υ/min ࡛Ỉ⣲ศᯒࢆ⾜ࡗࡓ࡜ࡁ㸪87㹼92 Υࡢࣆ࣮ࢡࡣ⢏⏺㸪ࢭ࣓ࣥࢱ࢖ࢺ⏺㠃㸪㌿఩ࡲࡓࡣཎᏊ✵Ꮝ࡞࡝࠿ࡽᨺฟࡉࢀࡓỈ⣲㸪127 Υ௜
㏆ࡢࣆ࣮ࢡࡣȚ R ࠿ࡽᨺฟࡉࢀࡓỈ⣲࡛࠶ࡾ㸪Ț R ࠿ࡽࡢỈ⣲ࡣ㸪௚ࡢỈ⣲ࢺࣛࢵࣉࢧ࢖ࢺ࠿ࡽࡢࡶࡢࡼࡾࡶ㧗࡛ᨺฟࡉࢀࡿ࡜ሗ࿌ࡋ࡚࠸ࡿ㸬ᮏ◊✲࡟࠾࠸࡚ࡶ㸪᪼㏿ᗘࡣ␗࡞ࡿ㸦᪼ ㏿ᗘ 12 Υ/min㸧ࡀ㸪Ț R ึᮇయ✚⋡ࡢ㧗࠸ TBF 㗰ࡢ᪉ࡀ㧗 ࡛Ỉ⣲ࢆከࡃᨺฟࡋ࡚࠸ࡓ㸬ࡇࢀࡽࡢࡇ࡜ࡼࡾ㸪TBF 㗰ࡣࣛࢫቃ⏺࡟ᏑᅾࡍࡿȚ R ࡲࡓ ࡣ Ț R㸭 ࣋ ࢖ ࢽ ࢸ ࢕ ࢵ ࢡ ࣇ ࢙ ࣛ ࢖ ࢺ ⏺ 㠃 ࡟ ከ ࡃ ࡢ Ỉ ⣲ࡀࢺࣛࢵࣉࡋࡓࡓࡵ࡟㸪࣮࢜ࢫࢸࣥࣃ࣮ฎ⌮࡟ࡼࡗ࡚㧗Ț R ึᮇయ✚⋡ࡢ TBF 㗰ࡢỈ⣲྾ⶶ㔞ࡀቑຍࡋࡓ࡜⪃࠼ࡽࢀࡿ㸬 -28-㸦a㸧GAthermal martensite
transformation

Strain-inducedYield strength ofaustenite

MS

Only plastic deformation,no martensite transformation㸦b㸧

Stress-assisted
G=0,Msmartensite

austenite

MST0Tᅗ  (a) ࣐ࣝࢸࣥࢧ࢖ࢺኚែࡢ࣓࢝ࢽࢬ࣒࡜ (b) ⮬⏤࢚ࢿࣝࢠ࣮ࡢኚ໬MSMdࢸࣥࢧ࢖ࢺኚែࡣపȚ R ึᮇⅣ⣲⃰ᗘࡢ TBF 㗰࡯࡝㉳ࡇࡽ࡞࠸࡜⪃࠼ࡽࢀࡿ㸬௨ୖࡢࡼ࠺࡟㸪㧗Ț R ึᮇⅣ⣲⃰ᗘࢆ᭷ࡍࡿ TBF 㗰ࡣ㸪ࣛ ࢫቃ⏺ ࠾ ࡼ ࡧ 㗰୰࡟ᚤ⣽ ᆒ୍࡟Ꮡᅾ ࡍࡿȚ R ࡀ Ỉ ⣲ ࢆ྾ⶶࡍࡿࡇ࡜࡟ࡼࡗ࡚ᪧȚ⢏⏺࡞࡝࡬ࡢỈ⣲ࢺࣛࢵࣉࢆᢚไࡋ㸪ᪧȚ⢏⏺࠿ࡽࡢࡁ⿣ࡀⓎ⏕࣭㐍ᒎࢆᢚไࡋࡓ࡜⪃ ࠼ ࡽࢀ ࡿ 㸬 ࡲ ࡓ 㸪Ᏻ ᐃ࡞Ț R ࡀ࣐ࣝࢸࣥࢧ࢖ࢺ ኚ ែ ࢆᢚ ไ ࡋ࡚㐜 ࢀ◚ ቯヨ㦂 ୰ࡢȚ R ࠿ࡽࡢ Ỉ⣲ࡢ ᨺฟ ࢆ ᢚ ไࡋࡓࡇ࡜࡟ࡼࡗ࡚㧗࠸㐜ࢀ◚ቯᙉᗘࢆ♧ࡋࡓ࡜⪃࠼ࡽࢀࡿ 㸬 ࡉࡽ ࡟ 㸪 Ț R ࡢࡦࡎࡳ ㄏ ㉳ኚែࡀ ᒁᡤ ⓗᛂຊ㞟 ୰ ࢆ⦆࿴ࡋ㸪ࡁ⿣ࡢ㐍ᒎࢆᢚไࡋࡓࡇ࡜ࡶ㐜ࢀ◚ቯᙉᗘࡢୖ᪼࡟ᐤ୚ࡋࡓ࡜⪃࠼ࡽࢀࡿ㸬㸬⤖ゝ㉸ 㧗 ᙉ ᗘ TBF 㗰ࡢ 㐜ࢀ◚ ቯ≉ᛶࢆ ᨵၿ ࡍࡿࡇ ࡜ ࢆ ┠ⓗ࡜ࡋ࡚㸪Ț R ≉ᛶࢆኚ໬ࡉࡏࡓ㉸㧗ᙉᗘ TBF ࡢỈ⣲྾ⶶ≉ᛶ࠾ࡼࡧ㐜ࢀ◚ቯ≉ᛶࢆㄪᰝࡋࡓ㸬ᚓࡽࢀࡓ୺࡞⤖ᯝࡣ௨ୗࡢ࡜࠾ࡾ࡛࠶ࡿ㸬
㸦1㸧TBF 㗰 ࡢ ඲ ྾ⶶỈ⣲㔞ࡣ㸪ᘬᙇᙉࡉࡀୖ ᪼ ࡍ ࡿ ࡟ࡋࡓࡀࡗ࡚ቑຍࡋࡓ㸬ࡲࡓ㸪ᣑᩓᛶỈ⣲ࡣ㸪 A =350 Υ㸪 A 㸻10 s ࡢ TBF 㗰ࡀ௚ࡢ TBF 㗰ࡼࡾࡶ㧗 ഃ࡛ከࡃᨺฟࡋ࡚࠸ࡓ㸬ࡇࢀࡣ㸪ࣛࢫቃ⏺࡟ᏑᅾࡍࡿȚ R ࡲࡓࡣȚ R 㸭࣋࢖ࢽࢸ࢕ࢵࢡࣇ࢙ࣛ࢖ࢺ⏺㠃࡟ከࡃࡢỈ⣲ࡀࢺࣛࢵࣉࡋࡓࡇ࡜࡟㉳ᅉࡋࡓ࡜⪃࠼ࡽࢀࡓ㸬
㸦2㸧TBF 㗰ࡣ㸪Ӎ1400 MPa ࡢ⠊ᅖ࡛ᘬᙇᙉࡉࡀ㧗ࡃ࡞ࡿ࡟ࡋࡓࡀࡗ࡚㐜ࢀ◚ቯᙉᗘࡀపୗࡋࡓ㸬ࡇࢀࡣ㸪㗰୰ ࡟ ᚤ⣽ ᆒ ୍࠿ ࡘ Ᏻᐃ࡟Ꮡᅾ ࡍࡿȚ R ࡀỈ ⣲ࢆ྾ ⶶ ࡋ ࡓࡇ ࡜ 㸪࠾ ࡼ ࡧ Ț R ࡢ࣐ࣝࢸࣥࢧ࢖ࢺኚ ែࡀ ᢚไࡉ ࢀ 㸪 㐜ࢀ ◚ቯヨ 㦂 ୰ ࡢ Ț R ࠿ࡽࡢ Ỉ ⣲ࡢᨺ ฟࡀᢚไࡉࢀ ࡓ ࡇ ࡜࡟㉳ᅉࡋࡓ࡜⪃࠼ࡽࢀࡓ㸬ㅰ㎡ᮏ◊✲ࢆࡈᨭ᥼࠸ࡓࡔࡁࡲࡋࡓ㸪㸦㈈㸧ኳ⏣㔠ᒓຍᕤᶵᲔᢏ⾡᣺⯆㈈ᅋ࡞ࡽࡧ࡟౪ヨ㗰ࢆᥦ౪ࡋ࡚࠸ࡓࡔ࠸ࡓಙᕞ
኱ᏛᕤᏛ㒊ᩍᤵᮡᮏබ୍ඛ⏕࡟῝ࡃឤㅰࡢពࢆ⾲ࡍࡿ࡜࡜ࡶ࡟㸪ὠᒣᕤᴗ㧗➼ᑓ㛛Ꮫᰯ༞ᴗ◊✲⏕ࡢ㓇ᮏ᫭ᕼẶ࡟ేࡏ࡚࠾♩࠸ࡓࡋࡲࡍ㸬Tཧ⪃ᩥ⊩
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