TRIP ㍑䈱㜞ㅦᄌᒻ᜼േ䈱⸃᣿䈫ടᎿ⺃⿠ᄌᘒ䈱᷷ᐲ䊶䈵䈝䉂ㅦᐲଐሽᕈ⎇ⓥઍ⴫⠪㩷 ౓ᐶ⋵┙ᄢቇ㩷 ಎᢎ᝼㩷 ࿯↰♿ਯ1.

✜⸒㋕㍑᧚ᢱ䈱ᒝൻᯏ᭴䈱ਛ䈪䋬㜞ᒝᐲ䋬㜞ᑧᕈ䋬ఝ䉏䈢㜞ㅦᄌᒻ᜼േ䈏ᦼᓙ䈘䉏䉎䉅䈱䈮

TRIP(Transformation Induced plasticity)ലᨐ䈏䈅䉎[1, 2]䋮TRIP ലᨐ䈲㋕㍑᧚ᢱ䈮⊒⃻䈜䉎․ᓽ⊛䈭ᒝൻᯏ᭴䈪䈅䉍䋬䉥䊷䉴䊁䊅䉟䊃(J)⚵❱䈱৻ㇱ䈏ᒝᐲ䈱㜞䈇䊙䊦䊁䊮䉰䉟䊃(D)⚵❱䈮ᄌᘒ䈜䉎(ടᎿ⺃⿠ᄌᘒ)䈖䈫䈮䉋䉍㜞ᒝᐲ䋬㜞ᑧᕈ䈏ᓧ䉌䉏䉎䈫⸒䉒䉏䈩䈇䉎䋮TRIP ലᨐ䈱⎇ⓥ䈲Ḱ቟ቯ䉥䊷䉴䊁䊅䉟䊃㍑[3]䈎䉌ᆎ䉁䉍䋬ૐ᷷↪ Ni ㍑[4]䈱⎇ⓥᚑᨐ䈏ႎ๔䈘䉏䈢ᓟ䋬ૐ὇⚛㍑䈮 Si 䉕ᷝട䈚䈢 TRIP ဳⶄ⋧㍑[5-7]䈏ᵈ⋡䈘䉏䋬ఝ䉏䈢㜞ㅦᄌᒻ᜼േ䉋䉍ㄭᐕ䈪䈲⥄േゞ↪᧚ᢱ䈫䈚䈩䈱೑↪䈏ㅴ䉄䉌䉏䈩䈇䉎䋮TRIP ലᨐ䈮䈧䈇䈩䈲䋬J䈎䉌D䈻䈱ടᎿ⺃⿠ᄌᘒ䈏㊀ⷐ䈪䈅䉎䈖䈫䈲᣿䉌䈎䈣䈏䋬ᄌᒻਛ䈱ടᎿ⺃⿠ᄌᘒ᜼േ䈫J䋬D⚵❱䈱ᓎഀ䉕⹦⚦䈮䉁䈢ቯ㊂⊛䈮⸃᣿䈜䉎⎇ⓥ䈲䈾䈫䉖䈬⷗䈅䈢䉌䈭䈇䋮䈘䉌䈮䈲䋬ⴣ⓭቟ోᕈ䉇⠴㔡ᕈ䉕⷗ᝪ䈋䈢㜞ㅦᄌᒻᤨ䈱ᄌᘒ᜼േ䈲ᧂ⍮䈱ㇱಽ䈏ᄙ䈇䋮䈖䈱ὐ䈏᣿䉌䈎䈫䈭䉏䈳䋬ఝ䉏䈢 TRIP ലᨐ䈱᧦ઙ䈫 TRIP ㍑䈱᧚ᢱ⸳⸘ᜰ㊎䉕␜䈜䈖䈫䈏น⢻䈫䈭䉍䋬TRIP ㍑䈱ㆡ↪᜛ᄢ䈮❬䈏䉎䈖䈫䈏ᦼᓙ䈪䈐䉎䋮એ਄䈱䈖䈫䈎䉌ᧄ⎇ⓥ䈪䈲䋬TRIP ലᨐ䈱ቯ㊂⊛⸃㉼䉕⋡⊛䈫䈚䋬ടᎿ⺃⿠ᄌᘒ᜼േ䉕ᄢ䈐䈒ᄌൻ䈘䈞䉎⹜㛎᷷ᐲ䈱ᓇ㗀䈮⌕⋡䈚䋬᭽䇱䈭᷷ᐲ䈮䈍䈔䉎ၮ␆䊂䊷䉺䉕ᢛℂ䈜䉎䈖䈫䈪䋬ఝ䉏䈢 TRIP ലᨐ䉕ᓧ䉎䈢䉄䈱ടᎿ⺃⿠ᄌᘒ᜼േ䈱ℂ⸃䈫ቯ㊂ൻ䉕⹜䉂䈢䋮ടᎿ⺃⿠ᄌᘒ᜼േ䈱ቯ㊂ൻ䈲 TRIP ㍑䈱․ᕈ੍᷹䊝䊂䊦᭴▽䈻䈫⊒ዷ䈘䈞䋬ఝ䉏䈢 TRIP ലᨐ䉕ᓧ䉎䈢䉄䈱᧦ઙ䉕⸘▚䈱┙႐䉋䉍᣿䉌䈎䈫䈚䋬᧚ᢱ⸳⸘ᜰ㊎䈱ឭ␜䈮❬䈕䉎䈖䈫䉅น⢻䈪䈅䉎䋮ᧄ⎇ⓥ䈮
䈍䈔䉎․ᓽ䈫䈚䈩䈲䋬㽲᷷ᐲ䍃䈵䈝䉂ㅦᐲଐሽᕈ䈱ᢛℂ䋬㽳ᄌᒻᤨ䈱ടᎿ⺃⿠ᄌᘒ᜼േ䈱᷷ᐲଐሽᕈ䈫 TRIP ലᨐ䈮䉋䉍ఝ䉏䈢ဋ৻િ䈶䉕ᓧ䉎䈢䉄䈱᧦ઙឭ␜䋬㽴䈠䈱႐ਛᕈሶ࿁᛬
ታ㛎䈮䉋䉎䉥䊷䉴䊁䊅䉟䊃⋧䈱ᄌᒻ䈮㑐䈜䉎⠨ኤ䋬䈮ᄢ೎䈘䉏䉎䋮
2.

ታ㛎ᣇᴺᧄ⎇ⓥ䈪䈲䋬Ꮢ⽼䈱Ḱ቟ቯ䉥䊷䉴䊁䊅䉟䊃㍑䈪䈅䉎 SUS304 ㍑䉕↪䈇䈢䋮శቇ㗼ᓸ㏜䉕↪

䈇䈩ฦ㕙䈱⚵❱ⷰኤ䉕ⴕ䈇䋬ᐔဋ⚿᥏☸ᓘ䉕᷹ቯ䈚䈢䋮㕒⊛ᒁᒛ⹜㛎䈲䋬ᐔⴕㇱ㐳䈘 25mm䋬᏷ 5 mm䋬ෘ䈘 1.5 mm 䈱᧼⁁⹜㛎䉕૞⵾䈚䋬䉩䉝㚟േᑼᒁᒛ⹜㛎ᯏ䉕↪䈇䈩ᕡ᷷ᮏ䈮䉋䉍⹜㛎᷷ᐲ䉕 123 䈎䉌 373 K 䈱㑆䈪ᄌൻ䈘䈞䋬ೋᦼ䈵䈝䉂ㅦᐲ 3.3x10-4 s-1 䈱᧦ઙ䈮䈩ⴕ䈦䈢䋮ᒁᒛ⹜㛎䈲⎕ᢿ䉁䈪ⴕ䈉䈫䈫䉅䈮䋬⹜㛎䉕ㅜਛ䈪ਛᢿ䈚䋬䈵䈝䉂㊂䈱⇣䈭䉎⹜ᢱ䉕Ḱ஻䈚䈢䋮䉁䈢䋬Ᏹ᷷䈮䈩䈵䈝䉂ㅦᐲ 100 䈎䉌 103 s-1 䉁䈪䈱㜞ㅦᒁᒛ⹜㛎䉕ⴕ䈦䈢䋮䈖䈱ᤨ䋬ᐔⴕㇱ㐳䈘 6 mm䋬᏷ 2 mm䋬ෘ䈘 1.2 mm 䈱⹜㛎䉕Ḱ஻䈚䋬⹜㛎䈲ᬌജ䊑䊨䉾䉪ᑼ⹜㛎ᯏ䉕↪䈇䈩ⴕ䈦䈢䋮ᒁᒛ⹜㛎䉕ㅜਛ䈪ਛᢿ䈚⇣䈭䉎䈵䈝䉂䉕ਈ䈋䈢⹜ᢱ䈲䋬X ✢࿁᛬䈮䉋䉍䉥䊷䉴䊁䊅䉟䊃䈫䊙㧙㧙䊦䊁䊮䉰䉟䊃䈱૕Ⓧ₸䉕᷹ቯ䈚䈢䋮X ✢࿁᛬䈲 KD-Cu ✢䉕↪䈇䈩䋬▤㔚࿶ 40 kV䋬▤㔚ᵹ 30mA䋬࿁᛬ㅦᐲ 2T=1㫦/min 䈱᧦ઙ䈪࿁᛬ⷺ 2T=40䌾95㫦䈱▸࿐䈪᷹ቯ䉕ⴕ䈦䈢䋮䈖䈱ᤨ⹜ᢱ䈲⴫㕙䈱ടᎿጀ䉕㔚⸃⎇⏴䈮䉋䉍㒰෰䈚䈢䋮X ✢࿁᛬⚿ᨐ䉋䉍䋬᷹ቯ䈘䉏䈢ฦ⋧䋬ฦ䊏䊷䉪䈱Ⓧಽᒝᐲ䈫䋬Bragg ⷺT䋬䊚䊤䊷ᜰᢙ(hkl)䋬‛⾰䈱⒳㘃䈮ଐሽ䈜䉎ቯᢙ䉕᳞䉄䋬ฦ⋧䈱૕Ⓧ₸䉕▚಴䈚䈢[8]䋮ᒁᒛᄌᒻਛ䈱䉥䊷䉴䊁䊅䉟䊃⋧䈱ᄌᒻ䉕⠨ኤ䈜䉎⋡⊛䈪䋬ᒁᒛᄌᒻਛ䈱䈠䈱႐ਛᕈሶ࿁᛬ታ㛎䉕ⴕ䈦䈢䋮ᧄታ㛎䈲䋬ᣣᧄේሶജ⎇ⓥ㐿⊒ᯏ᭴䈱ⷺᐲಽᢔဳᱷ⇐ᔕജ⸃ᨆⵝ⟎RESA(ᵄ㐳O=1.6㷬)䉕↪䈇䈢[9]䋮䈖䈱ᤨ䈱ᒁᒛ⹜㛎ᒻ⁁䈲䋬ᐔⴕㇱ㐳䈘 80 mm䋬ᐔⴕㇱ

᏷ 3 mm 䈪䈅䉎䋮ᒢᕈ䈍䉋䈶႟ᕈၞ䈱ᒁᒛ⽶⩄⁁ᘒ䈮䈍䈇䈩䋬ᒁᒛᣇะ䈮ኻ䈚䈩ု⋥䈭䉥䊷䉴䊁䊅䉟䊃(111)䋬(200)䋬(311)⚿᥏☸⟲䈎䉌䈱 Bragg ࿁᛬䉕᷹ቯ䈚䈢䋮࿁᛬䊒䊨䊐䉜䉟䊦䈎䉌䈲䋬ᩰሶ㕙㑆㓒䉕᳞䉄䋬ᩰሶ䈵䈝䉂䉕▚಴䈜䉎䈫䈫䉅䈮䋬ᄌᒻ䈮઻䈉࿁᛬Ⓧಽᒝᐲ䈱ᄌൻ╬䉕᳞䉄䈢䋮

Fig. 1

Optical micrographs of the SUS304 steel, where RD means rolling direction, ND
normal direction, TD transverse direction, respectively.

3.

⚿ᨐ䈫⠨ኤ
Fig. 1 䈮䋬SUS304 䈱శቇ㗼ᓸ㏜౮⌀䉕␜䈜䋮⚵❱䈲䉥䊷䉴䊁䊅䉟䊃න⋧䈪䈅䉍䋬⚵❱౮⌀䉕↪䈇䈩✢ಽᴺ䈮䉋䉍ᐔဋ⚿᥏☸ᓘ䉕᳞䉄䈢䈫䈖䉐 23㩷 Pm 䈪䈅䈦䈢䋮
Fig. 2 䈮䈲䋬⒳䇱䈱⹜㛎᷷ᐲ䈮䈍䈔䉎ᒁᒛ⹜㛎䈪ᓧ䉌䉏䈢౏⒓ᔕജ-䈵䈝䉂ᦛ✢䉕␜䈜䋮ฦ᷷ᐲ䈮䈍䈔䉎 0.2%⠴ജ䋬ᒁᒛᒝ䈘䋬ဋ৻િ䈶䈲䋬Fig. 3䋬Table 1 䈮ᢛℂ䈚䈢䋮373 K 䈎䉌⹜㛎᷷ᐲ䈏ૐਅ䈜䉎䈮ᓥ䈦䈩ᒁᒛᒝ䈘䈲Ⴧᄢ䈚䈢䋮䉁䈢䋬ဋ৻િ䈶䈲Ᏹ᷷(296 K)䉋䉍ዋ䈚㜞䈇
308 K 䈮䈩ᦨᄢ䈱୯䉕␜䈚䋬䈖䉏䈲ోિ䈶䈮䈧䈇䈩䉅ห᭽䈪䈅䈦䈢䋮0.2%⠴ജ䈮䈧䈇䈩䈲
243 K 䉁䈪䈲Ⴧᄢ䈚䈢䈏䋬᷷ᐲ䈏䈠䉏એਅ䈮䈭䉎䈫ૐਅ䈚䈢䋮䈖䉏䈲䉥䊷䉴䊁䊅䉟䊃⋧䈏㒠ફ䈜䉎೨䈮ടᎿ⺃⿠ᄌᘒ䈏⿠䈖䈦䈢䈢䉄䈪䈅䉎䈫⠨䈋䉌䉏䋬䈖䈱䈖䈫䈎䉌 SUS304 ㍑䈱 MsVὐ䈲
243 K ઃㄭ䈪䈅䉎䈖䈫䈏䉒䈎䈦䈢䋮㧙㧙

123K

1400

Nominal stress (MPa)

173K
1200

223K
243K

1000

273K

296K

800

308K

600
400
373K

200
0323K

Strain rate=3.3x10-4 s-1
00.2

0.4

0.60.81

1600-150

1400

Table 1-50

0100 (㷄)10050Tensile strength
80

1200
1000
80060

Uniform elongation
40600
400
200

200.2% proof stress

0100

Nominal strain

Fig. 2 Nominal stress-strain curves inthe SUS304 steel at varioustemperatures.

-100

Uniform elongation (%)

0.2% proof stress and tensile strength (MPa)

1600

150

200

250

300

Temperature (K)3500400Fig. 3 Mecanical properties as a functionof test temperature in the SUS304 steel.

Mechanical properties obtained by tensile tests at various temperatures with a strain

rate of 3.3x10-4 s-1.
Temperature (K)0.2% proofstress (MPa)Tensile strength(MPa)

Uniform
elongation (%)

Total elongation
(%)

123
173
223
243
273
288
296
308
323
373

280
268
302
325
313
329
307
311
298
270

1455
1257
1112
1040
954
897
790
786
696
585

38.6
42.6
47.0
50.7
58.7
63.9
79.9
82.7
68.5
54.0

45.5
50.9
55.0
57.6
64.8
68.8
83.6
85.2
74.3
64.0

SUS304 ㍑䈱᷷ᐲଐሽᕈ䈱䈉䈤䋬․䈮ဋ৻િ䈶䈱ᄌൻ䈮䈧䈇䈩䈲ᄌᒻਛ䈱ടᎿ⺃⿠ᄌᘒ᜼േ䈏ኒធ䈮㑐ଥ䈚䈩䈇䉎䈫ᕁ䉒䉏䉎䋮䈠䈖䈪䋬ᒁᒛ⹜㛎䉕ⴕ䈦䈢᧦ઙ䈱䈉䈤 123, 243, 273,296, 308 K 䈱 5 ⒳㘃䈱⹜㛎᷷ᐲ䈮䈍䈔䉎䋬ᄌᒻ䈮઻䈉䉥䊷䉴䊁䊅䉟䊃䈫ടᎿ⺃⿠䊙䊦䊁䊮䉰䉟䊃䈱૕Ⓧ₸䉕 X ✢࿁᛬䈮䉋䉍▚಴䈚䈢[8]䋮䈠䈱⚿ᨐ䉕 Fig. 4 䈮␜䈜䋮ᮮゲ䈱䈵䈝䉂䈫䈫䉅䈮䊙䊦䊁䊮䉰䉟䊃૕Ⓧ₸䈲Ⴧട䈚䋬ห䈛䈵䈝䉂㊂䈮䈍䈔䉎䊙䊦䊁䊮䉰䉟䊃૕Ⓧ₸䈲᷷ᐲૐਅ䈫䈫䉅䈮Ⴧട䈚䈢䋮䈭䈍䋬Fig. 4 䈮␜䈚䈢䊒䊨䉾䊃䈲 X ✢࿁᛬䈮䉋䉍▚಴䈚䈢⚿ᨐ䈪䈅䉍䋬ฦ᷷ᐲ䈮䈍䈔䉎᜼േ䉕␜䈚䈢ᦛ✢䈲䋬ਅ⸥䈮␜䈜 Matsumura 䉌[10]䈏ឭ᩺䈚䈢ᑼ䉕↪䈇䈩⸥ㅀ䈚䈢⸘▚⚿ᨐ䈪䈅䉎䋮㧙㧙§·VJ 0¸ 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 (1)
VD 1  ¨¨ 1  k q VJ H q ¸0©
¹䈖䈖䈪䋬H䈲⌀䈵䈝䉂䋬VD䈲䊙䊦䊁䊮䉰䉟䊃૕Ⓧ₸䋬VJ0 䈲ೋᦼ䉥䊷䉴䊁䊅䉟䊃૕Ⓧ₸䋬k 䈫 q 䈲ቯᢙ䈪䈅䉍䋬䈖䉏䉌䈲ታ㛎⚿ᨐ䉕䉅䈫䈮᳿ቯ䈚䈢䋮Fig. 4 䉋䉍䋬ఝ䉏䈢ဋ৻િ䈶䉕␜䈚䈢 308 K䈱⚿ᨐ䈮䈧䈇䈩⷗䉎䈫䋬㕖Ᏹ䈮ᄙ䈒䈱䉥䊷䉴䊁䊅䉟䊃䈏䊙䊦䊁䊮䉰䉟䊃䈮ᄌᘒ䈚䈩䈇䉎䉒䈔䈪䈲䈭䈒䋬ဋ৻િ䈶ઃㄭ䈮䈍䈔䉎䊙䊦䊁䊮䉰䉟䊃૕Ⓧ₸䈲⚂ 50 %䈪䈅䈦䈢䋮䉁䈢䋬䉥䊷䉴䊁䊅䉟䊃䈱ടᎿ቟ቯᕈ䉕⷗䉎ᜰᮡ䈱䈵䈫䈧䈮 Md30 ὐ䈏䈅䉎䈏䋬䈵䈝䉂 30 %ട䈋䈢䈫䈐䈱䊙䊦䊁䊮䉰䉟䊃
૕Ⓧ₸䈲⚂ 5 %䈪䈅䈦䈢䋮
Fig. 5 䈮䈲䋬Fig. 4 䈱⚿ᨐ䉕ర䈮䈵䈝䉂䈮ኻ䈜䉎ടᎿ⺃⿠ᄌᘒ䈱ㅦᐲ䈮䈧䈇䈩⸘▚䈚䈢⚿ᨐ䈪䈅䉎䋮䈇䈝䉏䈱᷷ᐲ䈮䈍䈇䈩䉅䋬ᄌᘒㅦᐲ䈲ᄌᒻ㐿ᆎ䈎䉌਄᣹䈚䋬ᦨᄢㅦᐲ䉕ㆊ䈑䈩䈎䉌䈲ૐਅ䈚䈢䋮䈖䈱ᤨ䋬ૐ᷷䈪䈅䉎䈾䈬ᦨᄢㅦᐲ䈲ૐ䈵䈝䉂஥䈮䈅䉍䋬䉁䈢ᦨᄢᄌᘒㅦᐲ䈲ᄢ䈐䈒䈭䈦䈢䋮308 K 䈱႐ว䋬ᦨᄢ䈱ᄌᘒㅦᐲ䈲⚂ 2 (䈵䈝䉂 1 %ട䈋䈢䈫䈐䈮 2 %䊙䊦䊁䊮䉰䉟䊃䈮ᄌᘒ䈜䉎)䈪䈅䉍䋬䈖䉏䈲 308 K 䈫䈾䈿ห䈛ဋ৻િ䈶䈪䈅䈦䈢 296 K 䈱႐ว䉅ห᭽䈪䈅䈦䈢䋮䉁䈢䋬ᦨᄢᄌᘒㅦᐲ䉕ㄫ䈋䉎䈵䈝䉂䈲⌀䈵䈝䉂䈪 0.4 䉁䈢䈲 0.5 䈪䈅䉍䋬ᒁᒛᄌᒻ䈱ᓟඨ䈪䈅䈦䈢䋮䈖䉏䉁䈪䈱ႎ๔䈪䈲䋬ᦨᄢ䈱 TRIP ലᨐ䈲䊈䉾䉨䊮䉫㐿ᆎ೨ᓟ䉇ᄌᒻ䈱ᓟඨ䈮ടᎿ⺃⿠ᄌᘒ䈏⿠䈖䉎䈖䈫䈪䈅䉎䈫ㅀ䈼䉌䉏䈩䈍䉍䋬ᧄታ㛎⚿ᨐ䈲䈖䉏䈫৻⥌䈚䈢䋮
8123 K

123K

7243K

0.8

Transformation rate (%/%)

Volume fraction of stress-induced martensite

1273K
0.6296K
0.4308K0.265243 K
4273 K

3296 K

2308 K

100

0.1

0.2

0.3

0.4

0.5

0.6

0.7

00

True strain

0.1

0.2

0.3

0.4

0.5

0.6

0.7

True strain

Fig. 4 Volume fraction of stress-induced
martensite as a function of true strain at
various temperatures.

Fig. 5 Stress-induced transformation rate
as a function of true strain at varioustemperatures.

એ਄䈱䈖䈫䈎䉌䋬SUS304 ㍑䈮䈍䈇䈩 TRIP ലᨐ䈮䉋䉍ఝ䉏䈢ဋ৻િ䈶䈏ᓧ䉌䉏䉎ടᎿ⺃⿠ᄌᘒ䈱᧦ઙ䈫䈚䈩䈲䋬㽲䈵䈝䉂 30 %ട䈋䈢䈫䈐䈱䊙䊦䊁䊮䉰䉟䊃૕Ⓧ₸䈏 5 %⒟ᐲ䈪䈅䉎䈖䈫䋬㽳䈵䈝䉂 1%ട䈋䈢䈫䈐䈱䊙䊦䊁䊮䉰䉟䊃૕Ⓧ₸䈲 2 %એਅ䈪䈅䉎䈖䈫䈏ᦸ䉁䈚䈇䋬䈖䈫䈱 2 ὐ䈏᣿䉌䈎䈫䈭䈦䈢䋮㧙㧙ᰴ䈮䋬䈵䈝䉂ㅦᐲଐሽᕈ䈮䈧䈇䈩ᬌ⸛䈚䈢⚿ᨐ䈫䈚䈩䋬Fig. 6 䈮 296 K 䈮䈩䈵䈝䉂ㅦᐲ䉕ᄌ䈋䈩ᒁᒛ⹜㛎䉕ⴕ䈦䈢ᤨ䈱౏⒓ᔕജ-䈵䈝䉂ᦛ✢䉕␜䈜䋮䈵䈝䉂ㅦᐲ䈏㜞䈒䈭䉎䈮䈚䈢䈏䈦䈩 0.2 %⠴ജ䈲Ⴧᄢ䈚䈢䈏䋬ᒁᒛᒝ䈘䉇ဋ৻િ䈶䈲 Fig. 2, 3 䈪␜䈚䈢䉋䈉䈭᷷ᐲଐሽᕈ䈫䈲⇣䈭䉎᜼േ䉕␜䈚䈢䋮䈚䈎䈚䈭䈏䉌䋬SUS304 ㍑䈱䈵䈝䉂ㅦᐲଐሽᕈ䈮䈧䈇䈩䉅ᄌᒻਛ䈱ടᎿ⺃⿠ᄌᘒ᜼േ䈏㊀ⷐ䈭ᓎഀ䉕ᨐ䈢䈚䈩䈇䉎䈫⠨䈋䉌䉏䉎䋮Ḱ቟ቯ䉥䊷䉴䊁䊅䉟䊃㍑䈱䈵䈝䉂ㅦᐲଐሽᕈ䈮䈧䈇䈩䈲䋬㜞ᧁ䉌[11]䈏 SUS301L ㍑䉕↪䈇䈩䈵䈝䉂ㅦᐲ 10-3䌾103 s-1 䈱▸࿐䈪䈱ᒁᒛ⹜㛎䉕ⴕ䈇䋬ടᎿ⺃⿠ᄌᘒ䈮䉋䉎䊙䊦䊁䊮䉰䉟䊃૕Ⓧ₸䈮䈧䈇䈩䉅⺞ᩏ䉕ⴕ䈦䈢䋮䈠䈱⚿ᨐ䋬ห䈛䈵䈝䉂䉕ട䈋䈢䈫䈐䈱䊙䊦䊁䊮䉰䉟䊃૕Ⓧ₸䈲䈵䈝䉂ㅦᐲ䈫䈫䉅䈮ᷫዋ䈚䋬䈵䈝䉂ㅦᐲ 100 s-1 એ਄䈮䈭䉎䈫૕Ⓧ₸䈲䈾䈫䉖䈬ᄌൻ䈏䈭䈇䈖䈫䈏䉒䈎䈦䈢䋮ടᎿ቟ቯᕈ䈲⇣䈭䉎䈏ห䈛Ḱ቟ቯ䉥䊷䉴䊁䊅䉟䊃㍑䈪䈅䉎 SUS304 ㍑䈮䉅ห᭽䈱䈖䈫䈏⿠䈖䈦䈩䈇䉎䈫⠨䈋䉎䈫䋬10-4s-1 䈫 101 s-1 એ਄䈱⚿ᨐ䈪ဋ৻િ䈶䈏⇣䈭䉎ℂ↱䈲䋬ടᎿ⺃⿠䊙䊦䊁䊮䉰䉟䊃૕Ⓧ₸䈏ᷫዋ䈚䈢䈖䈫䈏㑐ଥ䈚䈩䈇䉎䈫⠨䈋䉌䉏䉎䋮৻ᣇ䈪䋬101 s-1 એ਄䈱䈵䈝䉂ㅦᐲ䈪䈲ᄌᒻ䈮઻䈉ടᎿ⺃⿠ᄌᘒ᜼േ䈮ᄢ䈐䈭㆑䈇䈏䈭䈇䈫䈜䉎䈫䋬ㅢᏱ䈱䈵䈝䉂ㅦᐲଐሽᕈ䈱䉂䈪ᔕജ-䈵䈝䉂ᦛ✢䉇ᯏ᪾⊛․ᕈ䈏ᄌൻ䈚䈩䈇䉎䈫⠨䈋䉎䈖䈫䈏䈪䈐䋬ᒁᒛᒝ䈘䈲䈵䈝䉂ㅦᐲ䈫䈫䉅䈮Ⴧᄢ䈜䉎৻ᣇ䈪䋬ဋ৻િ䈶䈲ᷫዋ䈚䈢䈖䈫䈏ᄌᒻ䈮઻䈉J䈫D䈱૕Ⓧ₸ᄌൻ䉋䉍ផኤ䈜䉎䈖䈫䈏䈪䈐䉎䋮ㅢᏱ䋬ᄌᒻᔕജ䈱᷷ᐲ䊶䈵䈝䉂ㅦᐲଐሽᕈ䈲䋬ォ૏ㆇേ䈱ᾲᵴᕈൻㆊ⒟䈮䉋䈦䈩⼏⺰䈜䉎䈖䈫䈏䈪䈐䉎[12]䋮ᾲᵴᕈൻㆊ⒟䈏ᚑ┙䈜䉎᷷ᐲ䈫䈵䈝䉂ㅦᐲၞ䈪䈲䋬ᄌᒻᔕജ䈮䈍䉋䈿䈜᷷ᐲ䈫䈵䈝䉂ㅦᐲ䈱ᓇ㗀䈲╬ଔ䈪䈅䉎䈫⠨䈋䉌䉏䋬ᧄታ㛎⚿ᨐ䈮䈧䈇䈩䉅䋬䈾䈿Jන⋧䈱ᄌᒻᔕജ䈪䈅䉎 0.2 %⠴ജ䈮䈧䈇䈩䈲ᾲᵴᕈൻㆊ⒟䈪ᄌᒻᔕജ䉕⼏⺰䈪䈐䉎䈫ᕁ䉒䉏䉎䋮䈚䈎䈚䈭䈏䉌䋬ടᎿ⺃⿠ᄌᘒ᜼േ䈮䈧䈇䈩䈲᷷ᐲ䋬䈵䈝䉂ㅦᐲ䈱╬ଔᕈ䈲ᚑ䉍┙䈢䈢䈝[13]䋬․䈮䈵䈝
䉂ㅦᐲଐሽᕈ䈱⚿ᨐ䈮䈧䈇䈩䈲ടᎿ⺃⿠ᄌᘒ᜼േ䈏䈬䈱䉋䈉䈮ᢛℂ䈪䈐䉎䈎䈮䈧䈇䈩䈲ᦝ䈭䉎ᬌ⸛䈏ᔅⷐ䈪䈅䉎䋮

Nominal stress (MPa)800

103 s-1

600

3.3x10-4 s-1

102 s-1 101 s-1
400

200

000.2

0.4

0.60.8Nominal strain

Fig. 6 Nominal stress-strain curves with various strain rates at 296 K in the SUS304 steel.

㧙㧙ᦨᓟ䈮䋬䈠䈱႐ਛᕈሶ࿁᛬ታ㛎⚿ᨐ䈮䈧䈇䈩ㅀ䈼䉎䋮Fig. 7 䈮䈲䋬SUS310S䋬SUS304,SUS301L 䈱 3 ⒳㘃䈱䉥䊷䉴䊁䊅䉟䊃♽䉴䊁䊮䊧䉴㍑䈮䈍䈔䉎䉥䊷䉴䊁䊅䉟䊃⋧䈱ᩰሶ㕙䈵䈝䉂䈱ᄌൻ䉕౏⒓ᔕജ䈮ኻ䈚䈩ᢛℂ䈚䈢䋮䈖䈖䈪ข䉍਄䈕䈢 3 ⒳㘃䈱䉥䊷䉴䊁䊅䉟䊃㍑䈮䈧䈇䈩䈲䋬SUS310S ㍑䈏቟ቯ䉥䊷䉴䊁䊅䉟䊃㍑䋬SUS304 䈫 301L ㍑䈲Ḱ቟ቯ䉥䊷䉴䊁䊅䉟䊃㍑䈪䈅䉍䋬Ni
ᒰ㊂䉋䉍⠨䈋䉎䈫䋬304 ㍑䈱ᣇ䈏䉥䊷䉴䊁䊅䉟䊃䈱ടᎿ቟ቯᕈ䈏㜞䈇[14]䋮䉁䈢䋬Fig. 7 䈮␜䈚䈢ᩰሶ㕙䈵䈝䉂䈫䈲䋬ᄌᒻ䈮઻䈉ฦ㕙䈱䊏䊷䉪ⷺᐲ䉋䉍᳞䉄䉌䉏䉎ᩰሶ㕙㑆㓒䈱ᄌൻ䈎䉌ᓧ䉌䉏䉎䈵䈝䉂䈪䈅䉎[15]䋮
0.01

(a)

Lattice plane strain

0.008

(b)

(c)

J(200)

J(200)

J(200)

0.006

J(311)

J(311)

J(311)

0.004

J(111)

0.002

J(111)J(111)
0-0.002

0200

400

600

800

1000
0Applied stress (MPa)

200

400

600

Applied stress (MPa)

800

01000

200

400

600

800

1000

Applied stress (MPa)Fig. 7 Lattice plane strain as a function of applied stress obtained by in-situ neutron
diffraction experiments in the SUS310S (a), SUS304 (b), SUS301L (c).
ฦ䉥䊷䉴䊁䊅䉟䊃㍑䈫䉅䋬(111)ᩰሶ㕙䈵䈝䉂䈱ᄌൻ䈏ዊ䈘䈒䋬৻ᣇ䈪䋬(200)ᩰሶ㕙䈵䈝䉂䈱ᄌൻ䈲ᄢ䈐䈒䋬(311)ᩰሶ㕙䈵䈝䉂䈲䈠䈱ਛ㑆⊛䈭ᄌൻ䈪䈅䈦䈢[16]䋮䈖䈱䈖䈫䈎䉌䋬(200)䈲
⎬⾰☸䋬(111)䈲エ⾰☸䈪䈅䉎䈫್ᢿ䈪䈐䉎䋮䉁䈢䋬ห䈛౏⒓ᔕജ䈮䈍䈔䉎ฦ㕙䈱ᩰሶ㕙䈵䈝䉂䉕 3 ⒳㘃䈱⹜ᢱ䈪Ყセ䈜䉎䈫䋬ടᎿ⺃⿠ᄌᘒ䈏⿠䈖䉍䋬䊙䊦䊁䊮䉰䉟䊃૕Ⓧ₸䈏ᄙ䈒䈭䉎䈾䈬䋬䉥䊷䉴䊁䊅䉟䊃䈱ᩰሶ㕙䈵䈝䉂䈲ዊ䈘䈒䈭䈦䈩䈇䈢䋮䈖䉏䈲䊙䊦䊁䊮䉰䉟䊃૕Ⓧ₸䈏ᄙ䈇䈾䈬䋬䉥䊷䉴䊁䊅䉟䊃⋧䈏䉋䉍ᄌᒻ䈚䉇䈜䈒䈭䈦䈩䈇䉎䈖䈫䉕ᗧ๧䈚䋬䈖䉏䈲䉥䊷䉴䊁䊅䉟䊃⋧䈫䊙䊦䊁䊮䉰䉟䊃⋧䈱ᔕജಽ㈩䈫㑐ଥ䈚䈩䈇䉎䉅䈱䈫ᕁ䉒䉏䉎䋮䈘䉌䈮䋬㒰⩄ᓟ䈱ᱷ⇐ᩰሶ㕙䈵䈝䉂䈱ᄢ䈐䈘䉕⷗䉎䈫䋬310S ㍑䈫 304 ㍑䈲⎬⾰☸䈲ᒁᒛ䋬エ⾰☸䈲࿶❗䈪䈅䉎䈱䈮ኻ䈚䈩䋬৻⇟䊙䊦䊁䊮䉰䉟䊃૕Ⓧ₸䈱ᄙ䈎䈦䈢 301L ㍑䈲䋬⎬⾰☸䈪䈅䉎(200)㕙䉅࿶❗䈪䈅䈦䈢䋮䈖䉏䈲䋬ᄌᒻ䈮䉋䈦䈩䈅䉎⒟ᐲ䈱䊙䊦䊁䊮䉰䉟䊃ᄌᘒ䈏⿠䈖䉎䈫䋬䉥䊷䉴䊁䊅䉟䊃න⋧䈱ᄌᒻ䈎䉌䉥䊷䉴䊁䊅䉟䊃䈫䊙䊦䊁䊮䉰䉟䊃䈱 2 ⋧䈱ᄌᒻ䈻䈫ᄌൻ䈜䉎䈖䈫䈪䋬䊙䊦䊁䊮䉰䉟䊃⋧䈏⎬⾰⋧䈫䈚䈩௛䈐䋬䊙䊦䊁䊮䉰䉟䊃⋧䈮ᒁᒛ䈱ᱷ⇐䈵䈝䉂䈏ᱷ䈦䈢䈖䈫䈏੍ᗐ䈘䉏䉎䋮Fig. 7 䈪䈲ㅢᏱ䉥䊷䉴䊁䊅䉟䊃⋧ਛ䈱ਇဋ৻ᄌᒻ䉕⷗䈩䈇䉎䈏䋬਄⸥䈱㆑䈇䈲䈖䉏䈮ઁ䈱⋧䈱ᓇ㗀䈮䉋䉎ਇဋ৻ᄌᒻ䈏㊀䈭䈦䈩䈇䉎䈖䈫䉕⴫䈚䈩䈇䉎䋮એ਄䋬3 ⒳㘃䈱䉥䊷䉴䊁䊅䉟䊃㍑䈱ਛᕈሶ࿁᛬ታ㛎䉋䉍䋬ടᎿ቟ቯᕈ䈮䉋䈦䈩䉥䊷䉴䊁䊅䉟䊃⋧䈏ᜂ䈉ᄌᒻ䈮㆑䈇䈏⷗䉌䉏䉎䈖䈫䈏䉒䈎䈦䈢䋮㧙㧙4.

䉁䈫䉄(1) Ḱ቟ቯ䉥䊷䉴䊁䊅䉟䊃㍑䈪䈅䉎 SUS304 ㍑䉕↪䈇䈩᭽䇱䈭᷷ᐲ䈪ᒁᒛ⹜㛎䉕ⴕ䈦䈢䋮䈖䈱ᤨ䋬ᒁᒛᒝ䈘䈲᷷ᐲૐਅ䈫䈫䉅䈮Ⴧᄢ䈚䋬ဋ৻િ䈶䈲 308 K 䈱ᤨ䈮ᦨᄢ䈱୯䉕ᓧ䈢䋮(2) SUS304 ㍑䈮䈍䈔䉎ဋ৻િ䈶䈱᷷ᐲଐሽᕈ䈮䈧䈇䈩䋬ടᎿ⺃⿠ᄌᘒ᜼േ䈱ⷰὐ䈎䉌ᢛℂ䉕⹜䉂䈢䋮䈠䈱⚿ᨐ䋬TRIP ലᨐ䈮䉋䉍ఝ䉏䈢ဋ৻િ䈶䉕ᓧ䉎䈢䉄䈱ടᎿ⺃⿠ᄌᘒ䈱᧦ઙ䈲䋬䈵䈝䉂 30 %ട䈋䈢䈫䈐䈱䊙䊦䊁䊮䉰䉟䊃૕Ⓧ₸䈲⚂ 5 %䈪䈅䉎䈖䈫䈫䋬䈵䈝䉂䈮ኻ䈜䉎ടᎿ⺃⿠䊙䊦䊁䊮䉰䉟䊃䈱ᄌᘒㅦᐲ䈲 2 એਅ䈪䈅䉎䈖䈫䈱 2 ὐ䈏᣿䉌䈎䈫䈭䈦䈢䋮(3) 䈠䈱႐ਛᕈሶ࿁᛬ታ㛎䈮䉋䉍䋬SUS304 䉕䈲䈛䉄䋬SUS310S, SUS301L ㍑䈮䈍䈔䉎䉥䊷䉴䊁䊅䉟䊃⋧䈱ᄌᒻ䈮䈧䈇䈩ᬌ⸛䈚䈢䋮䈠䈱⚿ᨐ䋬୘䇱䈱[hkl]㈩ะ⚿᥏☸䈮䉋䉍႟ᕈᄌᒻ㊂䈏⇣䈭䉎䈖䈫䉇䋬ᄌᒻ䈫䈫䉅䈮ᄌᘒ䈜䉎ടᎿ⺃⿠䊙䊦䊁䊮䉰䉟䊃䈮䉋䉍䉥䊷䉴䊁䊅䉟䊃⋧䈱ᄌᒻ䈏ᓇ㗀䉕ฃ䈔䉎䈖䈫䈭䈬䈏␜䈘䉏䈢䋮⻢ㄉᧄ⎇ⓥ䈲䋬JFE21 ਎♿⽷࿅ᛛⴚ⎇ⓥഥᚑ䉋䉍េഥ䉕ฃ䈔䈩ታᣉ䈚䉁䈚䈢䋮㑐ଥฦ૏䈮ᷓ䈒ᗵ⻢↳䈚਄䈕䉁䈜䋮ෳ⠨ᢥ₂[1]

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