䊤䉴䊙䊦䊁䊮䉰䉟䊃䈱ടᎿ⚵❱䈮䈍䉋䈿䈜䊐䉞䊦䊛⁁ᱷ⇐䉥䊷䉴䊁䊅䉟䊃䈱ᓇ㗀⎇ⓥઍ⴫⠪㩷 ፉᩮᄢቇ✚วℂᎿቇㇱ㩷 ಎᢎ᝼᫪ᚭ⨃৻౒ห⎇ⓥ⠪㩷 ፉᩮᄢቇ✚วℂᎿቇㇱ㩷 ᢎ᝼ᄢᐸථ਽䈬䈮⃻䉏䉎㊀ⷐ䈭⚵❱䈪䈅䉎䇯䈖䈱⚵❱䈲ㅢᏱ䇮὾౉䉏䈫὾䉅䈬䈚ಣℂ䉕ᣉ䈘䉏䈩䈎䉌೑↪
䈘䉏䉎䇯䈚䈎䈚䇮䊐䉢䊤䉟䊃䉇䊌䊷䊤䉟䊃䈱䉋䈉䈮ടᎿᾲಣℂ䈱ೋᦼ⚵❱䈫䈚䈩↪䈇䉌䉏䉎䈖䈫䈲䈾䈫䉖䈬䈭䈇䇯䈖䉏䈲䊤䉴䌍䈱ടᎿᕈ䈏ᖡ䈇䈢䉄䈪䈅䉎䈏䇮ૐ὇⚛㍑䊤䉴䌍䈱ടᎿ䈲Ყセ⊛ኈᤃ䈪䈅䉍䇮䈠䈱ὑ䊤䉴䌍䉕ടᎿᾲಣℂ䈱

2㩷 䊤䉴䊙䊦䊁䊮䉰䉟䊃䋨એ㒠䊤䉴䌍䋩䈲Ꮏౕ㍑䈭

Vickers micro hardness, HV (kgf/mm )䋱䋮✜⸒
Fe-0.2C-2Mn Lath martensite

600

400

200

0Fe-0.0026C-1.48Mn Lath martensite
Fe-0.0026C-1.48Mn Equiaxed ferrite
020

4060
Reduction (%)

80ೋᦼ⚵❱䈫䈚䈩↪䈇䉎ᚻᴺ䈏ᵈ⋡䈘䉏䈩䈇䉎䇯 Fig. 1: ᭂૐ὇⚛㍑(Fe-0.0026C-1.48Mn)
଀䈋䈳 Ueji 䉌[1]䈲 Fe-0.13C ૐ὇⚛㍑䊤䉴䌍 ࡜ࠬ㧹㧘╬ゲࡈࠚ࡜ࠗ࠻߅ࠃ߮ૐ὇⚛㍑(Fe-0.2C-2Mn)࡜ࠬ㧹ߦ߅ߌࠆฦ࿶ᑧ₸䈮ㅢᏱ䈱಄㑆ടᎿ䋭὾㊰ಣℂ䉕ⴕ䈇䇮☸ᓘ ߣ⎬ᐲߩ㑐ଥ㧚1Pm એਅ䈱⿥ᓸ⚦☸㍑䉕ᓧ䈩䈇䉎䇯䉁䈢䇮ૐ὇⚛㍑䊤䉴䊙䊦䊁䊮䉰䉟䊃䉕䈠䈱䉁䉁ㇱຠ䈮ടᎿ䈚䈩૶↪䈜䉎⹜䉂䉅䈭䈘䉏䈩䈇䉎[2]䇯
㩷 䈖䈱䊤䉴䌍䉕↢࿾⚵❱䈮䈚䈢⚵❱೙ᓮ䉇೑↪ᴺ䈪䈲䊤䉴䌍䈱ടᎿ⚵❱䈏㊀ⷐ䈭ᓎഀ䉕ᨐ䈢䈜䇯ႎ๔⠪䈱৻ੱ䈲ᭂૐ὇⚛㍑䊤䉴䌍䈮಄㑆࿶ᑧ䉕ᣉ䈚䇮䈠䈱ടᎿ⚵❱䈱⊒㆐ㆊ⒟䈮䈧䈇
䈩ႎ๔䈚䈩䈇䉎[3]䇯䈠䉏䈮䉋䉎䈫䇮ടᎿೋᦼ䈪䊤䉴䌍䈲ᶖṌ䈚䇮ᣂ䈚䈇ടᎿ⚵❱䈏᭴▽䈘䉏䉎䈫䈚䈩䈇䉎䇯䈖䈱䉋䈉䈭⚵❱䈏⊒㆐䈜䉎ℂ↱䈲䇮䊤䉴Ⴚ⇇䈲቟ቯ䈚䈢Ⴚ⇇䈪䈲䈭䈇䈢䉄ኈᤃ䈮ᶖṌ䈍䉋䈶ౣ᭴▽䈘䉏䉎䈢䉄䈫⠨䈋䈩䈇䉎䇯৻ᣇ䇮ૐ὇⚛㍑䈪䈲䌍䈱䊤䉴䈲࿶ᑧ䈮䉋䈦䈩ኈᤃ䈮ᶖṌ䈞䈝䇮ਇဋ৻䈮೻ᢿ䋬ⶠᦛ䈘䉏䈢䊤䉴䈏⃻䉏䉎䈖䈫␜䈘䉏䈩䈇䉎[1,3]䇯䈖䈱ടᎿ⚵❱䈱⊒㆐ㆊ⒟䈱㆑䈇䈲ടᎿ⎬ൻ₸䈱㆑䈇䈮䉅⃻䉏䉎䇯Fig.1 䈮ᭂૐ὇⚛㍑䈫ૐ὇⚛㍑䊤䉴䌍䈍䉋䈶ᭂૐ὇⚛㍑䊐䉢䊤䉟䊃⚵❱䈱࿶ᑧ₸䈫⎬ᐲ䈱㑐ଥ䉕␜䈚䈩䈇䉎䇯䈖䉏䉕⷗䉎䈫䇮ᭂૐ὇⚛
㍑䊤䉴䌍䈪䈲ടᎿ⎬ൻ₸䈏ૐ䈒䇮․䈮ടᎿೋᦼ䈪䈲⎬ᐲ䈱ᄌൻ䈏䉂䉌䉏䈭䈇䇯䈠䉏䈮ኻ䈚䈩ૐ὇⚛㍑䊤䉴䌍䈲ടᎿ⎬ൻ₸䈏㜞䈒䇮ടᎿᐲ䈏਄䈏䈦䈩䉅ടᎿ⎬ൻ₸䈏㜞䈇䈖䈫䈏䉒䈎䉎䇯㩷 䈖䈱䉋䈉䈭ടᎿ⚵❱⊒㆐ㆊ⒟䈱㆑䈇䈲 1)䌍䊤䉴㑆䈮ሽ࿷䈜䉎ᱷ⇐䉥䊷䉴䊁䊅䉟䊃䋨એ㒠 RJ䋩䊐䉞䊦䊛[3]䋬2)䊤䉴䌍ਛ䈱࿕ṁ὇⚛[4]䈮䉋䉎䈫⠨䈋䉌䉏䈩䈇䉎䇯䈖䈱ੑ䈧䈱ⷐ࿃䈲੕䈇䈮ኒធ䈮㑐ଥ䈚䈩䈍䉍䇮䈠䉏䈡䉏䈱ᓇ㗀䉕ข䉍㒰䈒䈖䈫䈲㔍䈚䈇䇯䈠䈱䈢䉄䇮RJ䈫࿕ṁ὇⚛䈱䈬䈤䉌䈏䈬䉏䈒䉌䈇ടᎿ⚵❱ᒻᚑ䈮ᓇ㗀䉕ਈ䈋䉎䈱䈎ಽ䈎䈦䈩䈇䈭䈇䇯㩷 ᧄႎ๔䈪䈲ૐ὇⚛㍑䊤䉴䌍䈮὾䉅䈬䈚ಣℂ䉕ᣉ䈜䈖䈫䈮䉋䉍 RJ䊐䉞䊦䊛䉕೙ᓮ䈚䇮䈠䈱ടᎿ㍑⚵❱䈱⊒㆐ㆊ⒟䈍䉋䈶ᯏ᪾⊛ᕈ⾰䈱ᄌൻ䉕␜䈜䇯䉁䈢䇮࿕ṁ὇⚛䈍䉋䈶⓸⚛䉕㒰䈇䈢
Fe-Ni-Mn ว㊄䊤䉴䌍䈮಄㑆࿶ᑧ䉕ᣉ䈚䇮䈠䈱ടᎿ⚵❱䈱⊒㆐ㆊ⒟䉕⺞ᩏ䈚䈢䈱䈪䈠䈱⚿ᨐ㧙㧙䉅␜䈜䇯䈖䉏䉌䈱⚿ᨐ䉕〯䉁䈋䈩䇮䊤䉴䌍䈱ടᎿ⚵❱䈮䈍䉋䈿䈜䊐䉞䊦䊛⁁ RJ䈱ᓇ㗀䈮䈧䈇䈩⠨ኤ䈜䉎䇯䋲䋮ታ㛎ᣇᴺ૶ ↪ 䈚 䈢 ว ㊄ 䈲

Table 1: ⹜ᢱߩൻቇ⚵ᚑ(mass%)㧚

Fe-0.2C-2Mn ૐ ὇ ⚛ ㍑ 䈫CNMn

NiFe

0.206
0.00130.0008

2.017
4.41

20.21

bal.
bal.

㩷

Fe-Ni-Mn ว㊄䈪䈅䉎䇯ൻቇ⚵ᚑ䉕 Table 䋱䈮␜䈜䇯ૐ὇⚛㍑䈲 1453K 䈪ဋ৻ൻ䉕ૐ὇⚛㍑
Fe-Ni-Mn ว㊄ⴕ䈇䇮1473K䋬600s 䈱䉥䊷䉴䊁䊅䉟䊃ൻᓟ䈮᳓ਛ䈮὾౉䉏䈢䇯䈠䈱ᓟ䇮473K, 573K, 673K,773K 䈍䉋䈶 923K 䈪 600s 䈱὾䉅䈬䈚ಣℂ䉕ⴕ䈦䈢䇯Fe-Ni-Mn ว㊄䉅ห᭽䈮ဋ৻ൻ䉕ⴕ䈦䈢ᓟ䈮䇮1273k䋬86.4ks 䈱᳓⚛὾㊰ಣℂ䉕ᣉ䈚䈢䇯䈠䈱⹜ᢱ䉕 1473K䋬600s 䉥䊷䉴䊁䊅䉟䊃ൻᓟ䈮᳓ਛ䈮὾౉䉏䇮䈠䈱ᓟᶧ૕⓸⚛ਛ䈪 600s ଻ᜬ䉕ⴕ䈦䈢䇯䈖䉏䉌䈱⹜ᢱ䈮 10%, 30%, 50%,80%䈱಄㑆࿶ᑧ䉕ᣉ䈚䇮䈠䉏䉌䉕ⷰኤ↪⹜ᢱ䈫䈚䈢䇯㩷 ⚵❱ⷰኤ䈲䈜䈼䈩᧼᏷ᣇะ䈎䉌ⴕ䈦䈩䈇䉎䇯䉁䈢ⷰኤ䈮䈲 3%䊅䉟䉺䊷䊦⣣㘩䉕૶↪䈚䈢శቇ㗼ᓸ㏜ᴺ䇮⿛ᩏဳ㔚ሶ㗼ᓸ㏜䋯ᓟᣇ㔚ሶᢔੂ࿑ᒻ⸃ᨆᴺ䋨SEM/EBSD䋩䇮ㅘㆊဳ㔚ሶ㗼ᓸ㏜ᴺ䋨TEM䋩䉕↪䈇䈢䇯㩷 ᯏ᪾⊛ᕈ⾰䈲䊎䉾䉦䊷䉴⎬ᐲ᷹ቯ䈫ᒁᒛ⹜㛎䉕ⴕ䈦䈢䇯䊎䉾䉦䊷䉴⎬ᐲ᷹ቯ䈲ട㊀ 9.8N䋬
15s ଻ᜬ䈪 8 ὐ䈱᷹ቯ䉕ⴕ䈦䈢䇯ᒁᒛ⹜㛎䈲ᐔⴕㇱ 8.5mm䋬᏷ 2.5mm䋬ෘ䈘 0.5mm 䈱⹜ᢱ䈪ⴕ䈦䈢䇯䉁䈢䇮ೋᦼᱡㅦᐲ䈲 2.3x10-2/s 䈪ᱡ䉭䊷䉳䉕૶↪䈚䈢䇯䋳䋮⚿ᨐ
3.1㩷 ૐ὇⚛㍑䊤䉴䌍䈱ടᎿ⚵❱⊒㆐ㆊ⒟3.1.1㩷 శቇ㗼ᓸ㏜⚵❱ⷰኤ㩷 Fig.2 䈮὾౉䉏䉁䉁᧚䈱శቇ㗼ᓸ㏜౮⌀䉕␜䈜䇯䊑䊨䉾䉪䉇䊌䉬䉾䊃䈏䈲䈦䈐䉍䈚䈩䈍䉍䇮ౖဳ⊛䈭ૐ὇⚛㍑䊤䉴䌍䈪䈅䉎䈖䈫䈏ಽ䈎䉎䇯὾䉅䈬䈚䈮䉋䈦䈩శቇ㗼ᓸ㏜⚵❱䈲ᄢ䈐䈒ᄌൻ䈚䈭䈇 䇯 50% ಄ 㑆 ࿶ ᑧ 䉕 ᣉ 䈚 䈢 ὾ ౉ 䉏 䉁 䉁 䋬
473K䋬923K ὾䉅䈬䈚᧚䈱శቇ㗼ᓸ㏜౮⌀䉕
Fig.3 䈮␜䈜䇯౒䈮ⶠᦛ䉇೻ᢿ䈘䉏䈢䊑䊨䉾䉪䈏ⷰኤ䈘䉏䉎䈏䇮὾䉅䈬䈚᷷ᐲ䈏㜞䈇䈾䈬䈠䉏䈏⋡┙䈢䈭䈒䈭䉍䇮923K ὾䉅䈬䈚䈪䈲✭䉇䈎䈭ⶠᦛ䈲䈅䉎䉅䈱䈱䊑䊨䉾䉪⚵❱䉕଻䈦䈢䉁䉁ⷰኤ䈘䉏䉎䇯80%಄㑆࿶ᑧ䉕ᣉ䈜䈫䇮䈜䈼䈩䈱⹜ᢱ䈮䈍䈇䈩䇮࿶ᑧᣇะ䈮ᐔⴕ䈭ጀ⁁⚵❱䈏ⷰኤ䈘䉏䈢䇯

Fig. 2: ૐ὇⚛㍑࡜ࠬࡑ࡞࠹ࡦࠨࠗ࠻ߩశ
ቇ㗼ᓸ㏜౮⌀㧙㧙

3.1.2㩷 ടᎿ೨⚵❱䈱 TEM ⷰኤ㩷 Fig.4 䈮὾౉䉏䉁䉁䋬473K䋬573K䋬923K ὾䉅䈬䈚᧚䈱 TEM ௝䉕␜䈜䇯὾౉䉏䉁䉁䈫
473K ὾䉅䈬䈚᧚䈮䈲䊤䉴㑆䈮䊐䉞䊦䊛⁁ RJ䈏ⷰኤ䈘䉏䈩䈇䉎䈏䇮573K એ਄䈱὾䉅䈬䈚᧚䈮䈲䊐䉞䊦䊛⁁ RJ䉕⏕⹺䈜䉎䈖䈫䈲䈪䈐䈭䈎䈦䈢䇯䉁䈢䇮὾౉䉏䉁䉁᧚䈱䊤䉴ෘ䈏 0.23Pm
䈪䈅䉎䈱䈮ኻ䈚䇮923K ὾䉅䈬䈚᧚䈪䈲႐ᚲ䈮䉋䈦䈩䈲䊤䉴᏷䈏 0.38Pm 䉁䈪Ⴧട䈚䈩䈍䉍䇮䊤䉴䈱Ⲣว䈏⿠䈖䈦䈩䈇䉎䈖䈫䈏ಽ䈎䉎䇯὇ൻ‛䈲 473K 䉇 573K 䈱ૐ᷷὾䉅䈬䈚䈪䈲⚦䈎䈇㊎⁁䈫䈚䈩䊤䉴Ⴚ⇇䉇䊤䉴ౝㇱ䈮ⷰኤ䈘䉏䇮
923K ὾䉅䈬䈚䈪䈲ਥ䈮䊤䉴Ⴚ⇇䈮⃿⁁὇ൻ‛䈫䈚䈩ⷰኤ䈘䉏䈢䇯
3.1.3㩷 ૐ࿶ਅ⚵❱䈱 TEM ⷰኤ㩷 Fig.5 䈮 10%಄㑆࿶ᑧ䉕ᣉ䈚䈢὾౉䉏䉁䉁䋬
473K䋬573K䋬923K ὾䉅䈬䈚᧚䈱 TEM ௝䉕␜䈜䇯὾౉䉏䉁䉁䇮473K ὾䉅䈬䈚᧚䈪䈲䊤䉴䈱ᒻ⁁䈱ᄢ䈐䈭ᄌൻ䈲䈭䈇䈏䇮573K 䈫 923K ὾䉅䈬䈚᧚䈪䈲৻ㇱ䈮䊤䉴Ⴚ⇇䈱ᶖṌ䈏ⷰኤ䈘䉏䈩䈇䉎䇯㩷 30%಄㑆࿶ᑧ䉕ᣉ䈚䈢⹜ᢱ䈱 TEM ௝䉕
Fig.6 䈮␜䈜䇯὾౉䉏䉁䉁䇮473K ὾䉅䈬䈚᧚

Fig. 3: ૐ὇⚛㍑࡜ࠬ㧹ߩ 50%಄㑆࿶ᑧ䈪䇮⊕✢䈪␜䈜䉋䈉䈮䇮೻ᢿ䈘䉏䈢䊤䉴⹜ᢱߩశቇ㗼ᓸ㏜౮⌀㧚a) ὾౉ࠇ߹߹㧘

䋨Kinked Laths䋩䈏ⷰኤ䈘䉏䈩䈇䉎䇯䉁䈢䇮⎕b) 473K ὾߽ߤߒ㧘c) 923K ὾߽ߤߒ㧚✢䈪␜䈜䉋䈉䈮䊤䉴Ⴚ⇇䈏ᶖṌ䈚䈩䈇䉎▎ᚲ䉅䈗䈒䉁䉏䈮ⷰኤ䈘䉏䈩䈇䉎䇯৻ᣇ䇮573K 䈪䈲৻ㇱ䇮923K ὾䉅䈬䈚᧚䈪䈲ᐢ䈇㗔ၞ䈪䊤䉴Ⴚ⇇䈱ᶖṌ䈫ಽᢿ䈏ㅴ䉖䈪䈍䉍䇮䊤䉴⚵❱䈱ᶖṌ䈏ㅴ䉖䈪䈇䉎䈖䈫䈏ಽ䈎䉎䇯
3.1.4㩷 㜞࿶ਅ⚵❱䈱 TEM ⷰኤ㩷 50%಄㑆࿶ᑧ䉕ᣉ䈚䈢⹜ᢱ䈱 TEM ௝䉕 Fig.7 ␜䈜䇯὾౉䉏䉁䉁䈫 473K ὾䉅䈬䈚᧚䈪䈲೻ᢿᏪ䈏ⷰኤ䈘䉏䉎䉋䈉䈮䈭䉎䇯573K ὾䉅䈬䈚᧚䈪䈲䊤䉴Ⴚ⇇䈱ᶖṌ䈏ㅴⴕ䈚䈩䈇䉎䈖䈫䈏ಽ䈎䉍䇮
923K ὾䈐䉅䈬䈚䈪䈲䊤䉴䈫䈲㑐ଥ䈱䈭䈇ォ૏䉶䊦䈏᭴▽䈘䉏䈩䈇䉎䇯㩷 Fig.8 䈮␜䈜 80%಄㑆࿶ᑧ䉕ᣉ䈚䈢⹜ᢱ䈪䈲䇮䈬䈱⹜ᢱ䉅࿶ᑧᣇะ䈮ᐔⴕ䈭ጀ⁁⚵❱䈫䈭䈦䈩䈇䉎䈏䇮䈠䈱㑆㓒䈲὾䉅䈬䈚᷷ᐲ䈏㜞䈒䈭䉎䈮䈧䉏ᐢ䈏䈦䈩䈇䈒䈖䈫䈏ಽ䈎䉎䇯㧙㧙

ab

1 Pm

1 Pm
cd

1 Pm

1 Pm
fe

Fig. 4: ૐ὇⚛㍑὾߽ߤߒ࡜ࠬ㧹ߩ TEM ౮⌀㧚a) ὾౉ࠇ߹߹㧘b) a ߦ߅ߌࠆ RJߩᥧⷞ㊁௝㧘c) 473K ὾߽ߤߒ㧘d) c ߦ߅ߌࠆ RJߩᥧⷞ㊁௝㧘e) 573K ὾߽ߤߒ㧘f) 923K ὾߽ߤߒ㧚
3.1.5㩷 ฦ὾䉅䈬䈚᧚䈱㒠ફ᜼േ䈫⎬ᐲᄌൻ㩷 Fig.9 䈮ฦ࿶ᑧ₸䈮䈍䈔䉎⎬ᐲ䉕὾䉅䈬䈚᷷ᐲ䈗䈫䈮␜䈚䈩䈇䉎䇯ઁ䈱⹜ᢱ䈫Ყ䈼䇮὾౉䉏䉁
䉁䈫 473K ὾䉅䈬䈚᧚䈪䈲࿶ᑧೋᦼ䈮⎬ᐲ䈱਄᣹䈏⷗䉌䉏䇮ᓟᦼ䈪䉅⎬ᐲ䈱਄᣹䈏⷗䉌䉏䈢䇯䉁䈢䇮὾䉅䈬䈚᷷ᐲ䈱਄᣹䈫౒䈮⎬ᐲ䈏ਅ䈏䉍䇮ᭂૐ὇⚛㍑䊤䉴䌍䈱⎬ᐲᄌൻ䈮ㄭ䈨䈇䈩䈇䉎䈖䈫䈏ಽ䈎䉎䇯㧙㧙aabbccdd

Fig. 5: 10%಄㑆࿶ᑧ䉕ᣉ䈚䈢ૐ὇⚛㍑὾䊤䉴䌍䈱 TEM ౮⌀䋮a) ὾౉䉏䉁䉁䋬b) 473K

Fig. 6: 30%಄㑆࿶ᑧ䉕ᣉ䈚䈢ૐ὇⚛㍑὾䊤὾䉅䈬䈚䋬c) 573K ὾䉅䈬䈚䋬d) 923K ὾䉅䈬䉴䌍䈱 TEM ౮⌀䋮a) ὾౉䉏䉁䉁䋬b) 473K

䈚䋮὾䉅䈬䈚䋬c) 573K ὾䉅䈬䈚䋬d) 923K ὾䉅䈬䈚䋮㧙㧙aa

NDRDbb
NDRDc

NDRDcdNDRDFig. 8: 80%಄㑆࿶ᑧ䉕ᣉ䈚䈢ૐ὇⚛㍑὾䊤d䉴䌍䈱 TEM ౮⌀䋮a) ὾౉䉏䉁䉁䋬b) 473K
὾䉅䈬䈚䋬c) 573K ὾䉅䈬䈚䋬d) 923K ὾䉅䈬䈚䋮㩷 ᰴ䈮ฦ⹜ᢱኻ䈚䈩ᒁᒛ⹜㛎䉕ⴕ䈦䈢䇯䈠䈱⚿ᨐ䉕 Fig.10 䈮␜䈜䇯䉁䈝䇮὾౉䉏䉁䉁䈫473K ὾䉅䈬䈚᧚䈲䈾䈫䉖䈬ห䈛ᦛ✢䉕ឬ䈒䈏䇮573K ὾䉅䈬䈚䈪ടᎿ⎬ൻ₸䈏ૐਅ䈜䉎䈖䈫

Fig. 7: 50%಄㑆࿶ᑧ䉕ᣉ䈚䈢ૐ὇⚛㍑὾䊤䈏ಽ䈎䉎䇯䉁䈢䇮673K 䈪㒠ફὐ䈏᣿⍎䈮⃻䉴䌍䈱 TEM ౮⌀䋮a) ὾౉䉏䉁䉁䋬b) 473K

䉏䉎䇯䈖䈱䈫䈐䇮㒠ફᒝᐲ䈲 573K 䈱ᤨ䉋䉍㜞὾䉅䈬䈚䋬c) 573K ὾䉅䈬䈚䋬d) 923K ὾䉅䈬䈒䈭䉎䈏ടᎿ⎬ൻ₸䈏ૐ䈒䇮1%䈪 573K 䈱ᦛ䈚䋮✢䈫㊀䈭䉎䇯䈘䉌䈮὾䉅䈬䈚᷷ᐲ䈏਄᣹䈜䉎䈫䇮㧙㧙േ䈜䉎䇯䈖䈱䈫䈐䈱ടᎿ⎬ൻ₸䈲 673K 䈫䈾䈫䉖䈬ห䈛䈪䈅䉎䇯
3.2

Fe-Ni-Mn ว㊄䊤䉴䌍䈱ടᎿ⚵❱⊒

㆐ㆊ⒟
3.2.1

ടᎿ೨⚵❱

㩷 Fig.11 䈮 SEM/EBSD ⸃ᨆ䈮䉋䉎 IQ ࿑䉕␜

Vickers micro hardness, HV (kgf/mm2)䈠䉏䈮ᓥ䈦䈩ᔕജ䋭ᱡᦛ✢䈏ૐᔕജ஥䈮⒖

Fe-0.0026C-1.48Mn
Fe-0.2C-2Mn

600

4002000Tempered specimens in Fe-0.2C-2Mn
at 473K,
at 573K,
at 673K,
at 773K,
at 923K
0204060
Reduction (%)

80䈜䇯䈖䈱࿑䉕⷗䉎䈫ౖဳ⊛䈭䊤䉴䌍䈮⷗䈋䉎
䈏䇮Fig.11 䈪Ἧ⦡䈪␜䈘䉏䉎 RJ䊑䊨䉾䉪䈏ᄙ

Fig. 9: ૐ὇⚛㍑὾߽ߤߒ࡜ࠬ㧹ߩ࿶ᑧᢙⷰኤ䈘䉏䉎䇯Fig.12 䈲 TEM ௝䈪䈅䉍䇮䈖䈱₸ߣ὾߽ߤߒ᷷ᐲߩ㑐ଥ㧚࿑䈎䉌䊤䉴Ⴚ⇇䈮 RJ䊐䉞䊦䊛䈏ሽ࿷䈚䈩䈇䉎
䉍䇮RJ䊐䉞䊦䊛䈮䉃䉌䈏䈅䉍䇮ෘ䈇䈫䈖䉐䈫⭯䈇䈫䈖䉐䈏ሽ࿷䈚䈩䈇䉎䈖䈫䈏ಽ䈎䉎䇯䈖䉏䈲ઁ䈱ૐ὇⚛䈍䉋䈶ૐ⓸⚛㍑䊤䉴䌍䈪䈲ⷰኤ䈘
䉏䈭䈇․ᓽ䈪䈅䉎䇯
3.2.2

1000

Nominal stress (MPa)䈖䈫䈏ಽ䈎䉎䇯䈢䈣䈚䇮ૐ὇⚛㍑䈱႐ว䈫⇣䈭As quenched specimens

500
Tempered specimens
at 473K,
at 573K
at 673K,
at 773K
at 923K00ടᎿ⚵❱䈱⊒㆐㩷 Fig.13 䈮ฦ࿶ᑧ₸䈮䈍䈔䉎 TEM ௝䉕␜䈜䇯

0.5
Nominal strain (%)

1.010%಄㑆࿶ᑧ䈪䊤䉴䈲䈾䈫䉖䈬ᱷ䈦䈩䈇䉎੐

Fig. 10: ฦ὾߽ߤߒ࡜ࠬ㧹⹜ᢱߩᔕജ-ᱡ䈏ಽ䈎䉎䇯䉁䈢䇮࿶ᑧ೨᧚䈪䈲ⷰኤ䈘䉏䈭䈎ᦛ✢㧚䈦䈢ᄌᒻ෺᥏䈏ᄙ䈒ⷰኤ䈘䉏䈢䇯䈢䈣䈚䇮৻ㇱ䊤䉴Ⴚ⇇䈏ᶖṌ䈚䈩䈇䉎▎ᚲ䈏ⷰኤ䈘䉏䈩
䈇䉎䋨Fig.13(b)䋩䈏䇮ⷰኤⷞ㊁䈲ዋ䈭䈇䇯30%䈪䈲⎕✢䈪␜䈜䉋䈉䈮䊤䉴Ⴚ⇇䈏ᶖṌ䈚䈩䈇䉎▎ᚲ䈏⷗䉌䉏䉎䉋䈉䈮䈭䉎䇯RJ䊐䉞䊦䊛䈲䉁䈣ⷰኤ䈘䉏䉎䈏䇮䈗䈒䉒䈝䈎䈪䈅䉎䇯80%䈪䈲ઁ䈱⹜ᢱห᭽ో㕙࿶ᑧᣇะ䈮ᐔⴕ䈭ጀ⁁⚵❱䈮䈭䈦䈩䈇䈢䇯㩷 Fig.14 䈮࿶ᑧ₸䈫⎬ᐲ䈱࿑䉕␜䈜䇯䈖䉏䉕⷗䉎䈫⎬ᐲ䈲ᭂૐ὇⚛㍑䊤䉴䌍䈣䈏䇮࿶ᑧೋᦼ䈱⎬ᐲ䈱਄᣹䈲ૐ὇⚛㍑䊤䉴䌍䈫ห䈛䈪

Fig. 11: Fe-Ni-Mn ว㊄࡜ࠬ㧹ߩ IQ ࡑ࠶䈅䉎䇯䈢䈣䇮࿶ᑧᓟᦼ䈱ടᎿ⎬ൻ₸䈱਄᣹䈲ࡊ㧚⊕޿▎ᚲߪ RJࡉࡠ࠶ࠢ㧚ૐ὇⚛㍑䊤䉴䌍䈱ᣇ䈏㜞䈒䇮ᭂૐ὇⚛㍑䊤䉴
䌍䈱᜼േ䈮ㄭ䈇䇯㧙㧙Fig. 12: Fe-Ni-Mn ว㊄࡜ࠬ㧹ߩ TEM ௝㧚(a) ᣿ⷞ㊁௝㧘(b) ᥧⷞ㊁௝㧚ᥧⷞ㊁௝ߪ RJ߆ࠄߩ࿁᛬ࠍ૶↪ߒߚ㧚abc

dFig. 13: ಄㑆࿶ᑧࠍᣉߒߚ Fe-Ni-Mn ว㊄࡜ࠬ㧹ߩ TEM ௝㧚(a) (b) 10%㧘(c) 30%㧘(d) 80%಄㑆࿶ᑧ᧚㧚4.㩷 ⠨ኤ
4.1㩷 ടᎿ⚵❱䈮෸䈿䈜 RJ䈱ᓇ㗀㩷 ૐ὇⚛㍑䊤䉴䌍䈱ടᎿ⚵❱䈱⊒㆐䈲䇮RJ䊐䉞䊦䊛䈏⏕⹺䈪䈐䉎὾౉䉏䉁䉁䈫 473K ὾䉅䈬䈚᧚䈪䈲䊤䉴Ⴚ⇇䈏㜞࿶ਅ䉁䈪଻䈢䉏೻ᢿ䉕ฃ䈔䉎䉋䈉䈭ᄌᒻ䉕䈘䉏䉎䈱䈮ኻ䈚䇮㜞᷷὾䉅䈬䈚᧚䈪䈲䊤䉴Ⴚ⇇䈏፣䉏䇮䊤䉴䈏ಽᢿ䈘䉏䈩ᣂ䈚䈇ടᎿ⚵❱䈏ᒻᚑ䈘䉏䈩䈇䉎䇯䈖䉏䈲㜞᷷὾䉅㧙㧙ૃ䈩䈇䉎䈖䈫䉕␜䈚䈩䈇䉎䇯䉁䈢䇮࿕ṁ὇⚛䈍䉋䈶⓸⚛䈱䈾䈫䉖䈬฽䉁䉏䈭䈇 Fe-Ni-Mn ว㊄䈪䈲ടᎿೋᦼ䈲ૐ὇⚛㍑䊤䉴䌍䈱὾౉䉏䉁䉁䈱ടᎿ⚵❱䉕␜䈜䈏䇮࿶ᑧᓟᦼ䈮䈭䉎䈫ᭂૐ὇⚛䊤䉴䌍䈫ห䈛䉋䈉䈭ടᎿ⚵❱䈫䈭䉎䇯㩷 એ਄䈱䈖䈫䈎䉌䇮ૐ὇⚛㍑䊤䉴䌍䈱὾౉䉏䉁
䉁䉇 473K ὾䉅䈬䈚᧚䈪䈲䇮RJ䊐䉞䊦䊛䈏ടᎿ

Vickers micro hardness, HV (kgf/mm 2)䈬䈚䈪䈲ᭂૐ὇⚛㍑䊤䉴䌍䈱ടᎿ⚵❱䈫䉋䈒

600

400

200

0Fe-0.0026C-1.48Mn
Fe-0.2C-2Mn
Fe-20Ni-4.5Mn0ᤨ䈱ォ૏䈱ㆇേ䉕ᅹ䈕䉎䈢䉄䊤䉴Ⴚ⇇䈏㜞

204060
Reduction (%)

80࿶ᑧ䉁䈪ᱷ䉍䇮ⶠᦛ䈚䈢ടᎿ⚵❱䈏⊒㆐䈜䉎

Fig. 14: ᭂૐ὇⚛㍑㧘ૐ὇⚛㍑߅ࠃ߮䈫⠨䈋䉌䉏䉎䇯Fe-Ni-Mn ว㊄䈪䉅ห᭽䈮࿶ᑧ

Fe-Ni-Mn ว㊄࡜ࠬ㧹ߩ࿶ᑧ₸ߣ⎬ᐲߩ䈮䉋䉍䊤䉴Ⴚ⇇䈏ᶖṌ䈚䈭䈇䇯䈚䈎䈚䇮ૐ὇⚛

㑐ଥ㧚㍑䊤䉴䌍䈫⇣䈭䉍䇮RJ䈻䈱࿕ṁ὇⚛䈱⒖േ䈏ή䈇䈢䉄࿶ᑧ䈮䉋䉍 RJ䈏ਇ቟ቯ䈫䈭䉍䇮࿶ᑧᓟᦼ䈪䈲 RJ䈱ലᨐ䈲䈭䈒䈭䉍䇮ᭂૐ὇⚛䊤䉴䌍䈱႐ว䈫ห䈛䉋䈉䈮䊤䉴⚵❱䈱ᶖṌ䋬ォ૏䉶䊦䈱᭴▽䈏⿠䈖䉎䈫⠨䈋䉌䉏䉎䇯
4.2㩷 ടᎿ⚵❱䈮෸䈿䈜὾䉅䈬䈚䈱ᓇ㗀
㩷 RJ䊐䉞䊦䊛䈏ሽ࿷䈜䉎⁁ᴫ䈪ടᎿ䉕ฃ䈔䈢႐ว䇮䊤䉴⇇㕙䈮ਇဋ৻䈭ᔕജ㓸ਛ䈏䈍䈐೻ᢿ䈏౉䉎䇯Ꮒⷞ⊛䈮ⷰኤ䈘䉏䈢䉅䈱䈏శቇ㗼ᓸ㏜䈪ⷰኤ䈘䉏䈢೻ᢿ䈘䉏䈢䊑䊨䉾䉪䈪䈅䉎䈫⠨䈋䉌䉏䉎䇯శቇ㗼ᓸ㏜ⷰኤ䈪䈲 573K એ਄䈱὾䉅䈬䈚᧚䇮䈧䉁䉍 RJ䊐䉞䊦䊛䈏ሽ࿷䈚䈭䈇⹜ᢱ䈪䉅೻ᢿᏪ䈏ⷰኤ䈘䉏䈩䈇䉎䇯䈖䉏䈲䊤䉴Ⴚ⇇䈱ᓸ⚦὇ൻ‛䈏ォ૏䈱ㆇേ䉕㒖ኂ䈘䈞䈩䈇䉎䈢䉄䈫⠨䈋䉌䉏䉎䇯䈢䈣䇮䊐䉞䊦䊛⁁ RJ䈫Ყ䈼὇ൻ‛㑆䈱㑆㓒䈏ᐢ䈇䈢䉄䇮䊤䉴Ⴚ⇇䈱ᶖṌ䈮䈲䈅䉁䉍ነਈ䈚䈩䈇䈭䈇䈫⠨䈋䉌䉏䉎䇯㩷 Fig.10 䈮␜䈚䈢䉋䈉䈮 573K એ਄䈱὾䉅䈬䈚᧚䈪䉅὾䉅䈬䈚᷷ᐲ䈱਄᣹䈮䉋䈦䈩ടᎿ⎬ൻ₸䈏ૐਅ䈜䉎䇯䈖䉏䈲὾䉅䈬䈚䈮䉋䉍὇ൻ‛䈏☻ᄢൻ䈜䉎䈖䈫䈮䉋䈦䈩䊤䉴Ⴚ⇇䈱଻⼔⢻ജ䈏ૐਅ䈚䇮䊤䉴⚵❱䈏ኈᤃ䈮ᶖṌ䈜䉎䉋䈉䈮䈭䈦䈢䈢䉄䈫⠨䈋䉌䉏䉎䇯䈢䈣䇮673K ὾䉅䈬䈚᧚䈱ടᎿ⎬ൻ᜼േ䈣䈔䈏䇮ઁ䈱⹜ᢱ䈫⇣䈭䈦䈩䈇䉎䇯䈖䉏䈲὇ൻ‛䈱⃿⁁ൻ[5]䈭䈬὇ൻ‛ᒻᘒ䈱ᄌൻ䈮䉋䉎ലᨐ䈫⠨䈋䉌䉏䉎䈏䇮⹦⚦䉕ᬌ⸛䈜䉎ᔅⷐ䈏䈅䉎䇯
4.3㩷 RJ䊐䉞䊦䊛䈱ᒻ⁁䈫࿕ṁ὇⚛
㩷 Fig.4 䈪␜䈚䈢䉋䈉䈮ૐ὇⚛㍑䊤䉴䌍䈱 RJ䈲䊤䉴㑆䈮⭯䈇䊐䉞䊦䊛⁁䈮ሽ࿷䈚䈩䈇䉎䇯473K
὾䉅䈬䈚䉕ᣉ䈚䈢⹜ᢱ䈮䈍䈇䈩䉅䊐䉞䊦䊛䈱ᒻᘒ䈮ᄌൻ䈲⷗䉌䉏䈭䈎䈦䈢䇯Fig.15 䈮␜䈜䉋䈉䈮 Fe-0.2mass%N ว㊄䈪䉅ૐ὇⚛㍑䊤䉴䌍䈫ห䈛ဋ৻䈭䊐䉞䊦䊛⁁ RJ䈏ⷰኤ䈘䉏䈩䈇䉎[6]䇯
䈠䉏䈮ኻ䈚 Fe-Ni-Mn ว㊄䈱 RJ䈲ဋ৻䈭䊐䉞䊦䊛⁁䈮䈲䈭䉌䈝䇮RJ䈱ෘ䈇㗔ၞ䈫⭯䈇㗔ၞ䈏ᷙ࿷䈚䈩䈇䉎䇯Fe-Ni-Mn ว㊄䊤䉴䌍䈱 RJ䊐䉞䊦䊛䈏ਇဋ৻䈪䈅䉎ℂ↱䈲䇮䊙䊦䊁䊮䉰䉟䊃ᄌᘒ䈏ቢో䈮⚳ੌ䈚䈩䈇䈭䈇䈢䉄䊤䉴Ⴚ⇇䈏ធ⸅䈜䉎䉁䈪ᚑ㐳䈚䈩䈇䈭䈢䉄䈫⠨䈋䉌䉏䉎䇯䈠䈱ὑ䇮ᄌᘒ㚟േജ䈏਄䈏䉏䈳ᭂૐ὇⚛㍑䈱䉋䈉䈮䊤䉴ห჻䈏ធ⸅䈜䉎䈫⠨䈋䉌䉏䉎䇯ૐ὇⚛䊶⓸⚛

㧙㧙abFig. 15: Fe-0.2mass%N ว㊄࡜ࠬ㧹ߩ TEM ௝㧚(a) ᣿ⷞ㊁௝㧘(b) ᥧⷞ㊁௝㧚ᥧⷞ㊁௝
ߪ RJ߆ࠄߩ࿁᛬ࠍ૶↪ߒߚ㧚[6]㍑䈪䈲䊙䊦䊁䊮䉰䉟䊃ᄌᘒ䈲ቶ᷷䈪⚳ੌ䈚䈩䈍䉍䇮ᧄ᧪䈭䉌䊤䉴ห჻䈲ធ⸅䈚䈩䈇䉎䈲䈝䈪䈅䉎䇯ታ㓙䈮䈲䇮䊤䉴䈏ᚑ㐳䈚䊤䉴ห჻䈱㑆㓒䈏⁜䈒䈭䈦䈢䈫䈐䇮䉥䊷䉴䊁䊅䉟䊃䈻䈱ᱡ䉇ᔕജ䈮䉋䉍䊤䉴䈱ᚑ㐳ㅦᐲ䈏ㆃ䈒䈭䉎䈫⠨䈋䉌䉏䉎䇯䈠䈱䈫䈐䈮㍑䈮฽䉁䉏䉎὇⚛䈍䉋䈶⓸⚛䈏 RJ䊐䉞䊦䊛䈮࿕ṁ䈚䇮䊐䉞䊦䊛⁁ RJ䈫䈚䈩቟ቯൻ䈜䉎䈫⠨䈋䉌䉏䉎䇯5.㩷 ⚿⸒㩷 એ਄䈱⚿ᨐ䈎䉌એਅ䈱⚿⺰䈏ᓧ䉌䉏䈢䇯䊶䊤䉴䌍䈱ടᎿ⚵❱䈲䇮RJ䊐䉞䊦䊛䈏䈅䉎႐ว䇮䊤䉴Ⴚ⇇䉕଻䈦䈢䉁䉁ടᎿ䈏ㅴⴕ䈚䇮೻ᢿ䉇ⶠᦛ䈘䉏䈢䊤䉴䈏⃻䉏䇮ᦨ⚳⊛䈮䈲ጀ⁁⚵❱䈫䈭䉎䇯RJ䊐䉞䊦䊛䈏䈭䈇䈫䈐䈲䇮䊤䉴⚵❱䈲ടᎿೋᦼ䈮ᶖṌ䈚䇮ᣂ䈚䈇ടᎿ⚵❱䈏᭴▽䈘䉏䉎䇯䊶࿕ṁ὇⚛䈲䊤䉴Ⴚ⇇䈮⋥ធᓇ㗀䉕෸䈿䈘䈭䈇䈏䇮RJ䊐䉞䊦䊛䈮࿕ṁ䈜䉎䈖䈫䈪䊐䉞䊦䊛䉕቟ቯൻ䈘䈞䉎௛䈐䈏䈅䉎䇯䉁䈢䇮RJ䈏ဋ৻䈮䊐䉞䊦䊛ൻ䈜䉎䈢䉄䇮䊤䉴Ⴚ⇇ో૕䉕଻⼔䈜䉎䇯6.㩷 ⻢ㄉ㩷 ᧄ⎇ⓥ䈲䌊䌆䌅䋲䋱਎♿⽷࿅䈱⎇ⓥഥᚑ䉕䈉䈔䈩ⴕ䉒䉏䈢䇯TEM ⷰኤ䈲ፉᩮᄢቇ✚ว⑼ቇ⎇ⓥᡰេ䉶䊮䉺䊷‛⾰ᯏ⢻ಽᨆಽ㊁䈍䉋䈶✚วℂᎿቇㇱ‛⾰⑼ቇ⑼ዊ㊁ᢎ᝼䈱ⵝ⟎䉕೑↪
䈚䈩ⴕ䉒䉏䈢䇯
7.㩷 ෳ⠨ᢥ₂
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