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http://support.spring8.or.jp/Report_JSR/PDF_JSR_31A/2019A1027.pdf

2019A1027BL46XUඃࢀࡓᙉᗘᘏᛶࣂࣛࣥࢫࢆᣢࡘ 0.15C-2Si-7%Mn 㗰࠾ࡼࡧ Ti-17 ྜ㔠ࡢᘬᙇヨ㦂୰ࡢ㌿఩ᐦᗘኚ໬ࡢ ᐃIn-situ Measurement of the Change in the Dislocation Density of 0.15C-2Si7Mn Martensitic Steel and Ti-17 Alloy with Excellent Strength – DuctilityBalance㫽ሯ ྐ㑻, ఀᮾ ⠜ᚿ
Shiro Torizuka and Atsushi Itoරᗜ┴❧኱Ꮫ኱Ꮫ㝔The Graduate School of Engineering, University of Hyogoඃࢀࡓᙉᗘ࣭ᘏᛶࣂࣛࣥࢫࢆᣢࡘ 0.15C-2Si-7%Mn 㗰࡜ Ti-17 ྜ㔠ࡢຍᕤ◳໬ᣲືࢆゎᯒࡍࡿࡓࡵ࡟ࠊᘬᙇヨ㦂ࡑࡢሙ㏱㐣 X ⥺ᅇᢡࢆ⾜ࡗࡓࠋᘬᙇᙉࡉ 1.5 GPa ⣭ࡢ㧗ᙉᗘᮦᩱ㗰࡛࠶ࡿ 0.15C2Si-7%Mn 㗰ࡢ࣐ࣝࢸࣥࢧ࢖ࢺ⤌⧊ࡢຍᕤ◳໬⬟࡟↔Ⅼࢆ࠶࡚ࠊຍᕤ◳໬⬟ࠊ㌿఩ᐦᗘࡢୖ㝈ࡸࡑࡢቑຍᣲືࢆ᫂ࡽ࠿࡟ࡋࡓࠋࡲࡓࠊTi㸫17 ྜ㔠࡟㛵ࡋ࡚ࡶࠊ㌿఩ᐦᗘࡢቑຍᣲືࢆㄪ࡭ࡓ㸬࣮࣮࢟࣡ࢻ㸸 ࣇࣞࢵࢩ࣐ࣗࣝࢸࣥࢧ࢖ࢺࠊṧ␃࣮࢜ࢫࢸࢼ࢖ࢺࠊ㉸ᚤ⣽⤌⧊ࠊᘬᙇヨ㦂ࠊ
ࡑࡢሙ㏱㐣 X ⥺ᅇᢡࠊᙉᗘࠊᘏᛶࠊຍᕤㄏ㉳ኚែ⫼ᬒ࡜◊✲┠ⓗ㸸ᵓ㐀⏝㔠ᒓᮦᩱࡢᅜ㝿➇தຊࡣࠊࡑࡢᅜࡢ⏘ᴗ඲యࡢ➇தຊࢆᕥྑࡍࡿ࡜࠸ࡗ࡚ࡶ㐣ゝ࡛ࡣ࡞࠸ࠋᙉ࠸⣲ᮦ⏘ᴗࡀ࠶ࡿ࠿ࡽࡇࡑࠊᙉ࠸⮬ື㌴⏘ᴗࡀ࠶ࡾࠊ⯟✵ᶵ⏘ᴗࠊᶵᲔ⏘ᴗࡀ࠶ࡿࠋ≉࡟⮬ື㌴⏝ࣁ࢖ࢸࣥ 㧗ᙉᗘ㗰ᯈ ࡣࠊ⮬ື㌴⏘ᴗࡢ➇தຊࡢ᰿ᖿࢆ࡞ࡍᢏ⾡࡛࠶ࡿࠋࡲࡓࠊTi ྜ㔠ࡣ௒ᚋࡢ᪥ᮏࡢ⯟✵ᶵ⏘ᴗࢆᨭ࠼ࡿᮦᩱ࡜࡞ࡿࠋࡋ࠿ࡋࠊ㧗ᙉᗘ࡛࠶ࡾࠊఙࡧࡶ኱ࡁࡃࠊ㠎ᛶࡶ㧗࠸࡜࠸࠺ඃࢀࡓࢺ࣮ࢱࣝࣂࣛࣥࢫࢆᣢࡗࡓ㔠ᒓᮦᩱࠊ࠸ࢃࡺࡿ㠉᪂ⓗ࡞㔠ᒓᮦᩱࡣᏑᅾࡋ࡞࠸ࠋ
ࡑࢀࡣࠊࡇࢀࡽࡢᛶ㉁ࡀࢺ࣮ࣞࢻ࢜ࣇࡢ㛵ಀ࡟࠶ࡿ࠿ࡽ࡛࠶ࡿࠋࡍ࡞ࢃࡕࠊᘬᙇᙉࡉࢆୖࡆࢀࡤࠊఙࡧࡸ㠌ᛶࡣపୗࡋ࡚ࡋࡲ࠺ࠋࡇࡢࢺ࣮ࣞࢻ࢜ࣇࡢ㛵ಀࢆᡴ◚ࡋࠊ㠉᪂ⓗᵓ㐀ᮦᩱࢆᐇ⌧ࡍࡿࡇ࡜ࢆ┠ᶆ࡜ࡋ࡚ࠊᡃࠎࡣ◊✲䠄ᅜᐙࣉࣟࢪ࢙ࢡࢺ ⏘Ꮫඹ๰ᇶ♏ᇶ┙◊✲ࣉࣟࢢ࣒ࣛ ࣊ࢸࣟᵓ㐀ไᚚ䠅ࢆ᥎㐍ࡋ࡚ࡁࡓࠋࡲࡓࠊ⌧ᅾ࡛ࡣ SIP㸦ᡓ␎ⓗ࢖ࣀ࣮࣋ࢩࣙࣥ๰㐀ࣉࣟࢢ࣒ࣛ㸧ࣉࣟࢪ࢙ࢡࢺ
ࢆ᥎㐍୰࡛࠶ࡿࠋࡑࡢᡂᯝ࡜ࡋ࡚ࠊ0.1%C-2%Si-5%Mn ⤌ᡂࢆ࣮࣋ࢫ࡜ࡋࡓ 2 ࡘࡢ࣊ࢸࣟ⤌⧊ࢆᚓࡓࠋ୍ࡘࡣ࣐ࣝࢸࣥࢧ࢖ࢺ⤌⧊࡛ࠊᘬᙇᙉࡉ 1400 MPa ⣭࡛㧗ᘏᛶ࡜㧗㠌ᛶࡶྠ᫬࡟㐩ᡂ࡛ࡁࡿྍ⬟ᛶࢆᣢࡘࠋࡶ࠺୍ࡘࡣࣇ࢙ࣛ࢖ࢺ㸩࣮࢜ࢫࢸࢼ࢖ࢺ஧┦⤌⧊࡛ࠊẕ┦࡜ศᩓ┦ࡢᚤ⣽໬࡟ࡼࡗ࡚ࠊᘬᙇᙉࡉࡣ 1200 MPa ࣞ࣋ࣝࡔࡀࠊ30%ࢆ㉸࠼ࡿ኱ࡁ࡞୍ᵝఙࡧ࡜ᒁ㒊ఙࡧࢆేࡏᣢࡘࠋᘬᙇᙉࡉ㹶඲ఙࡧࣂࣛࣥࢫࡣࠊ30000 MPa%ࢆ㉸࠼ࠊ᪤Ꮡ㗰࡟ẚ࡭ᴟࡵ࡚ඃࢀ࡚࠸ࡿ[1-5]ࠋࡑࡢඃࢀࡓຊᏛⓗ≉ᛶⓎ⌧࣓࢝ࢽࢬ࣒ࢆゎ᫂ࡍࢀࡤࠊ㠉᪂ⓗᵓ㐀ᮦᩱ㛤Ⓨࡢษࡾཱྀࢆぢ࠸ࡔࡍࡇ࡜ࡀ࡛ࡁࠊḟୡ௦⮬ື㌴⏝ࣁ࢖ࢸࣥࡸ⯟✵ᶵ⏝ Ti ྜ㔠ࡢ㛤Ⓨ࡟ࡘ࡞ࡀࡿࠋ௒ᅇࠊࡉࡽ࡞ࡿᙉᗘ࣭ᘏᛶࡢྥୖࢆ┠ᣦࡋ࡚ࠊC ῧຍ㔞ࢆ 0.15-0.20%࡟ୖࡆࠊMn ῧຍ㔞ࢆ 7%࡟ୖࡆࡓᮦᩱࢆస〇ࡋࡓࠋࡲࡓࠊ௒ᅇࡣ࣐ࣝࢸࣥࢧ࢖ࢺ⤌⧊ࡢຍᕤ◳໬⬟࡟↔Ⅼࢆ࠶࡚ࡿࠋC ῧຍ㔞ࢆ 0.15-0.20%ࠊMn ࡀ 7%࡜ቑ࠼ࡿࡇ࡜࡟ࡼࡗ࡚ࠊ㌿఩ᐦᗘࡢୖ㝈ࡸࡑࡢቑຍᣲືࡶࠊ5%Mnࡢሙྜ࡜␗࡞ࡿࡣࡎ࡛࠶ࡿࠋࡲࡓࠊ࠶ࡽࡓ࡟ࠊ⯟✵ᶵ࢚ࣥࢪࣥᮦᩱ࡛࠶ࡿ Ti-17 ྜ㔠ࡢᘬᙇヨ㦂୰ࡢ㌿఩ᐦᗘኚ໬ࡢ ᐃࡶヨࡳࡿࠋᘬᙇヨ㦂ࢆ⾜࠸࡞ࡀࡽ X ⥺ᅇᢡࢆ⾜࠸ࠊ㌿఩ᐦᗘࡢቑຍࢆࢲ࢖
ࢼ࣑ࢵࢡ࡟࡜ࡽ࠼ࡿࡇ࡜ࢆ┠ⓗ࡜ࡋࡓࠋᐇ㦂㸸ヨᩱࡣ㗰࠾ࡼࡧ Ti ྜ㔠࡛࠶ࡾࠊࡑࡢ⤌ᡂࡣࠊFe-0.15C-2.0Si-7MnࠊFe-0.2C-2.0Si-7MnࠊFe-0.3C 2.0Si-7Mnࠊ࠾ࡼࡧ Fe-0.1C -2.0Si-10MnࠊFe-0.15C-2.0Si-5MnࠊFe-0.2C-2.0Si-5Mn ࡛࠶ࡿࠋࡲࡓࠊSUS304ࠊSUS316 ࡶ⏝࠸ࡓࠋTi ྜ㔠ࡣࠊTi-17 ྜ㔠࡛ࡑࡢ⤌ᡂࡣ Ti-5Al-2Zr-2Sn-4Mo-4Cr ࡛࠶ࡿࠋ䠉㻝㻣㻥䠉
ࡲࡓࠊTi-6Al-4V ྜ㔠ࡶ⏝࠸ࡓࠋMn 㗰࡟㛵ࡋ࡚ࡣࠊ┿✵⁐ゎࠊ㘫㐀ࠊ 㛫⁁࣮ࣟࣝᅽᘏࢆ≀㉁࣭
ᮦᩱ◊✲ᶵᵓ࡟࡚⾜࠺ࠋึᮇ⤌⧊ࢆᚤ⣽ࣇ࢙ࣛ࢖ࢺ㸩ࢭ࣓ࣥࢱ࢖ࢺ⤌⧊࡜ࡋ࡚࠾ࡃࠋࡑࡢᮦᩱࢆ኱Ꮫ࡟࠾࠸࡚⇕ฎ⌮ࢆ⾜࠸࣐ࣝࢸࣥࢧ࢖ࢺ⤌⧊࡜ࡋ࡚࠾ࡃࠋSUS304ࠊSUS316 ࡟㛵ࡋ࡚ࡣࠊරᗜ
┴❧኱Ꮫࡢᅽᘏタഛ࡛ࠊ1 ȝm ㉸ᚤ⣽⤌⧊ࢆసࡾฟࡋࡓࠋࡲࡓࠊ⇕ฎ⌮࡟ࡼࡗ࡚ࠊ2 ȝmࠊ5 ȝm ⤌⧊ࡶసࡾฟࡋ࡚࠾ࡃࠋTi-17 ྜ㔠࡟㛵ࡋ࡚ࡣࠊ㘫㐀⣲ᮦࢆࡑࡢࡲࡲ⏝࠸ࡿࠋ ᐇ㦂⿦⨨ࡢᴫ␎ࢆ Fig.1 ࡟♧ࡍࠋᘬᙇヨ㦂∦ヨᩱࡣᖹ⾜㒊㛗ࡉ 12 mmࠊᖜ 2.5 mmࠊཌࡉ 0.4 mm
ࡢᘬᙇヨ㦂∦࡛ࠊBL46XU ࡢࢦࢽ࣓࣮࢜ࢱୖ࡟タ⨨ࡋࡓᘬᙇࡾヨ㦂ᶵ࡟ྲྀࡾ௜ࡅࡓࠋ1 ḟඖ᳨ฟჾMynthen ࢆ⏝࠸ࡓࠋ᳨ฟჾࡢ఩⨨ࡣࠊ㕲ࡢሙྜࠊ2ș ࡀ 5-35°ࡢ⠊ᅖ࡛ィ ࡛ࡁࡿࡼ࠺࡟ࠊ㐺ษ࡞఩⨨࡟タ⨨ࡋࡓࠋ X ⥺ࡢ࢚ࢿࣝࢠ࣮ࡣ 30 keV ࡜ࡋࡓࠋᮦᩱࡣ㕲㗰ᮦᩱ࡛࠶ࡿࡀᯈཌ 0.5 mm ࡛࠶ࢀࡤ༑ศ࡞ᅇᢡᙉᗘࡀᚓࡽࢀࡓࠋᘬᙇ㏿ᗘࡣࡦࡎࡳ㏿ᗘ 0.26 mm/min ࡜࡞ࡿࡼ࠺࡟⾜ࡗࡓࠋᘬᙇⲴ㔜ࡢ ᐃ࡟ࡣࠊ᭱኱Ⲵ㔜 20 N ࡢ࣮ࣟࢻࢭࣝࢆ⏝࠸ࡿࠋࡲࡓࠊCCD ࣓࢝ࣛࢆᣢࡕ㎸ࡳࠊヨ㦂∦ࡢఙࡧࢆ┤᥋ィ ࡋࡓࠋほᐹࡍࡿ X ⥺ࡢࣆ࣮ࢡࡣ㕲ࡢሙྜࠊࣇ࢙ࣛ࢖ࢺ┦࡛䠄110䠅ࠊ䠄200䠅ࠊ䠄211䠅ࠊ䠄220䠅ࠊ䠄310䠅ࠊ䠄321䠅ࡢྛ㠃࡜࣮࢜ࢫࢸࢼ࢖ࢺ┦࡛ࡣࠊ䠄111䠅ࠊ䠄200䠅ࠊ䠄220䠅ࠊ䠄311䠅ࠊ䠄222䠅
࡛࠶ࡿࠋ1 ḟඖ᳨ฟჾ Mynthen ࢆ⏝࠸࡚ࠊᘬᙇヨ㦂ࢆ⾜࠸࡞ࡀࡽ X ⥺ᅇᢡࢆྠ᫬࡟⾜࠺ࠊIn-situ ᘬᙇヨ㦂 X ⥺ᅇᢡࢆ⾜ࡗࡓࠋᛂຊ̿ࡦࡎࡳ᭤⥺ࢆྲྀᚓࡋ࡞ࡀࡽࠊᛂຊ̿
ࡦࡎࡳ᭤⥺࡟ᑐᛂࡍࡿ X ⥺ᅇᢡࢹ࣮ࢱࢆᚓࡓࠋࢹ࣮ࢱࡢ ᐃ㛫㝸ࡣࠊ1 s ⛬ᗘ࡜ࡍࡿࠋᚓࡽࢀࡓࢹ࣮ࢱࢆࡶ࡜
Fig.1 Schematic illustration of the insitu transmission type X-ray
࡟ࠊࡲࡓࠊ್༙ᖜࡼࡾࠊಟṇ Williamson-Hall ἲࢆ⏝࠸࡚diffraction suring tensile test㌿఩ᐦᗘ࠾ࡼࡧ㌿఩㓄ิࢆ♧ࡍಀᩘ M ࢆồࡵࡓࠋࡇࡢ
system [4].
࡜ࡁࠊ㔜せ࡞ࡢࡣࠊ㗰ࡢሙྜࠊࣇ࢙ࣛ࢖ࢺࡢ㧗ゅഃࡢ 3ᮏࡢࣆ࣮ࢡ䠄220䠅ࠊ䠄310䠅ࠊ䠄321䠅࡛ࠊ≉࡟㔜せ࡞ࡢࡣ
䠄321䠅࡛࠶ࡾࠊ㧗࠸ࣆ࣮ࢡᙉᗘࡀᚲせ࡛࠶ࡿࠋࣆ࣮ࢡᙉ
ᗘࡀప࠸࡜ࠊಟṇ Williamson Hall ἲࢆᵓᡂࡍࡿࣃ࣓ࣛ
࣮ࢱ࣮࡛࠶ࡿ Chkl ࡸ q ࡜࠸ࡗࡓࢥࣥࢺࣛࢫࢺࣇ࢓ࢡࢱ࣮ࡢ⟬ฟࡢㄗᕪࡀ኱ࡁࡃ࡞ࡿࠋṇ☜࡞㌿఩ᐦᗘࡸ㌿఩㓄ิࡢ⟬ฟ࡟ࡣࠊ㧗ゅഃࡢࣆ࣮ࢡ࡟༑ศ࡞ᙉᗘࡀᚲせ࡛࠶ࡿࠋ⤖ᯝ࠾ࡼࡧ⪃ᐹ㸸್༙ᖜኚ໬࠿ࡽࠊಟṇ Williamson Hall ἲ࡟ࡼࡾ㌿఩ᐦᗘࢆࡶ࡜ࡵࡿࡇ࡜ࡀ࡛ࡁࡓࠋFig.2 ࡟ 5Mn 㗰ࡢ⤖ᯝࢆ
Fig.2 Relationship between true stress ♧ࡍࠋtrue strain curves and change indislocation density [3].
Fe-C-2.0Si-5Mn 㗰࡟࠾࠸࡚ࠊC ⃰ᗘࢆ 0.075%࠿ࡽ
0.2%ࡲ࡛ୖࡆࡿࡇ࡜࡟ࡼࡗ࡚ࠊ0.15%ࡲ࡛ࡣᙉᗘ࣭ᘏᛶ
࡜ࡶ࡟ྥୖࡋࡓࠋ0.2%ࡲ࡛ୖࡆࡿ࡜ࠊᙉᗘࡣࡉࡽ࡟ୖ᪼ࡍࡿࡶࡢࡢࠊᘏᛶࡣపୗࡋࡓࠋ
௒ᚋࡢㄢ㢟㸸 ಟṇ Williamson Hall ἲࢆ⏝࠸࡚ࠊ㌿఩ᐦᗘኚ໬ࢆゎᯒ୰ࢆ㐍ࡵࡿࠋཧ⪃ᩥ⊩㸸[1] 㫽ሯྐ㑻ࡽࠊᖹᡂ 29 ᖺᗘ SPring-8 ⏘ᴗ᪂ศ㔝ᨭ᥼ㄢ㢟୍࣭⯡ㄢ㢟㸦⏘ᴗศ㔝㸧ᐇ᪋ሗ࿌᭩
㸦2017B㸧ࠊ2017B1934.
[2] 㫽ሯྐ㑻ࡽࠊᖹᡂ 27 ᖺᗘ SPring-8 ⏘ᴗ᪂ศ㔝ᨭ᥼ㄢ㢟୍࣭⯡ㄢ㢟㸦⏘ᴗศ㔝㸧ᐇ᪋ሗ࿌᭩
㸦2015A㸧ࠊ2015A1847.
[3] ๓⏣᫭ᏹࠊ㫽ሯྐ㑻ࠊ㊊❧኱ᶞࠊ⮬ື㌴ᢏ⾡఍ㄽᩥ㞟 49, 856䠄2018䠅.
䠉㻝㻤㻜䠉[4] Ᏻ㐩⠇ᒎࠊ㫽ሯྐ㑻ࠊ㊊❧኱ᶞࠊఀᮾ⠜ᚿࠊ㕲࡜㗰ࠊ105, 197䠄2019䠅.
[5] ⵿⏣࿴ᶞࠊ㊊❧኱ᶞࠊ㫽ሯྐ㑻ࠊCAMPS-ISIJ 31-2, PS-99䠄2018䠅.

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