JP2020147782A - 造形体製造方法、中間体および造形体 - Google Patents
造形体製造方法、中間体および造形体 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 239000000047 product Substances 0.000 title abstract 5
- 239000013067 intermediate product Substances 0.000 title abstract 3
- 239000000843 powder Substances 0.000 claims abstract description 41
- 239000000956 alloy Substances 0.000 claims abstract description 34
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 34
- 230000004927 fusion Effects 0.000 claims abstract description 18
- 239000013078 crystal Substances 0.000 claims description 59
- 238000010438 heat treatment Methods 0.000 claims description 35
- 229910052758 niobium Inorganic materials 0.000 claims description 13
- 230000001678 irradiating effect Effects 0.000 claims description 12
- 229910052750 molybdenum Inorganic materials 0.000 claims description 10
- 229910052726 zirconium Inorganic materials 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 238000000926 separation method Methods 0.000 abstract 1
- 239000000543 intermediate Substances 0.000 description 38
- 238000001513 hot isostatic pressing Methods 0.000 description 30
- 230000000052 comparative effect Effects 0.000 description 26
- 238000012360 testing method Methods 0.000 description 14
- 238000001816 cooling Methods 0.000 description 11
- 230000032683 aging Effects 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 239000011261 inert gas Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000001887 electron backscatter diffraction Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 229910052715 tantalum Inorganic materials 0.000 description 3
- OCKGFTQIICXDQW-ZEQRLZLVSA-N 5-[(1r)-1-hydroxy-2-[4-[(2r)-2-hydroxy-2-(4-methyl-1-oxo-3h-2-benzofuran-5-yl)ethyl]piperazin-1-yl]ethyl]-4-methyl-3h-2-benzofuran-1-one Chemical compound C1=C2C(=O)OCC2=C(C)C([C@@H](O)CN2CCN(CC2)C[C@H](O)C2=CC=C3C(=O)OCC3=C2C)=C1 OCKGFTQIICXDQW-ZEQRLZLVSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000012300 argon atmosphere Substances 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241001596784 Pegasus Species 0.000 description 1
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- 238000005266 casting Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
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Abstract
Description
パウダーベッドフュージョンでは、ガンマプライム析出強化型Ni基合金からなるパウダーを用いる。パウダーベッドフュージョンではパウダーを溶融させる熱源が電子ビームである場合もあるが、本実施形態では熱源がレーザである。
熱処理工程で行われる熱処理は、例えば、図3に示すように、HIP処理、溶体化処理および時効処理を含む。ただし、HIP処理が省略されてもよいし、HIP処理と溶体化処理の双方が省略されてもよい。
IN713C相当の合金成分を有するパウダーを用いたパウダーベッドフュージョンにより積層方向に長い直方体状(10mm×10mm×60mm)の中間体を作製した。パウダーの粒子径分布は16〜45μmであった。また、パウダーの合金成分を分析すると、Ni以外の成分の含有量が、Cr:12.41%、Al:5.94%、Mo:4.36%、Nb:1.94%、Ta:0.009%、Ti:0.68%、Zr:0.11%、C:0.06%、B:0.01%、Co:0.18%、Cu:0.02%、Fe:0.20%、Si:0.03%であった(不可避的不純物の含有量については省略)。
各層上にレーザを照射する際の走査線の間隔を0.06mmとした以外は実施例1A,1Bと同様にして造形体を製造した。つまり、実施例2AはHIP処理を行わなかったもの、実施例2BはHIP処理を行ったものである。
各層上にレーザを照射する際の走査線の間隔を0.07mmとした以外は実施例1A,1Bと同様にして造形体を製造した。つまり、実施例3AはHIP処理を行わなかったもの、実施例3BはHIP処理を行ったものである。
各層上にレーザを照射する際の走査線の間隔を0.03mmとした以外は実施例1A,1Bと同様にして造形体を製造した。つまり、比較例1AはHIP処理を行わなかったもの、比較例1BはHIP処理を行ったものである。
各層上にレーザを照射する際の走査線の間隔を0.04mmとした以外は実施例1A,1Bと同様にして造形体を製造した。つまり、比較例2AはHIP処理を行わなかったもの、比較例2BはHIP処理を行ったものである。
各層上にレーザを照射する際の走査線の間隔を0.09mm、レーザ走査速度を1250mm/s、レーザ出力を270Wとした以外は実施例1A,1Bと同様にして造形体を製造した。つまり、比較例3AはHIP処理を行わなかったもの、比較例3BはHIP処理を行ったものである。
各層上にレーザを照射する際の走査線の間隔を0.11mm、レーザ走査速度を960mm/s、レーザ出力を285W、走査回転角を67度とした以外は実施例1A,1Bと同様にして造形体を製造した。比較例4AはHIP処理を行わなかったもの、比較例4BはHIP処理を行ったものである。
実施例1A〜3A,1B〜3Bおよび比較例1A〜4A,1B〜4Bの中間体を長手方向(積層方向)と直交する面で切断し、その切断面における{100}面の配向率を計算した。この計算には、EBSD装置として、日立製作所社製SEM-SU5000およびEDAX/TSL社製Pegasus Digiview5を用いるとともに、解析ソフトウェアとしてEDAX/TSL社製OIM Data Collection/OIM Analysis ver.8を用いた。
実施例1,2Bおよび比較例1B〜4Bの造形体を長手方向(積層方向)と平行な面で切断し、その切断面で観測される各柱状結晶粒の形状を同面積の楕円形に近似したときの短軸長の平均に対する長軸長の比であるアスペクト比を計算した。この計算には、配向率の計算に用いたものと同じEBSD装置および解析ソフトウェアを用いた。結晶粒界の同定にあたっては、閾角度の設定を15度とした。短軸長の平均および長軸長の平均の算出にあたっては、近似された楕円の面積により重みづけされた平均とした。
実施例1A〜3A,1B〜3Bおよび比較例1A〜4A,1B〜4Bの造形体から、図4に示すような棒状の試験片を削り出し、この試験片を長手方向に引っ張り、試験片が破断するまでの時間を測定した。試験片の温度は980℃とし、引張応力は90MPaとした。
2 ベッド
3 層
4 走査線
Claims (5)
- ガンマプライム析出強化型Ni基合金からなるパウダーを用いたパウダーベッドフュージョンにより中間体を作製する作製工程と、
前記中間体を熱処理する熱処理工程と、を含み、
前記Ni基合金は、質量百分率で、10〜16%のCr、4.5〜7.5%のAl、2.8〜6.2%のMo、0.8〜4%のNb+Ta、0.01〜2%のTi、0.01〜0.3%のZr、0.01〜0.3%のCを含有し、
前記作製工程において、前記パウダーからなる層上に互いに平行な複数の走査線に沿ってレーザを照射する際に、前記複数の走査線の間隔をレーザスポット径で割ったときの値を0.6以上1.0以下とする、
造形体製造方法。 - 前記熱処理工程で行う熱処理は、HIP処理を含む、請求項1に記載の造形体製造方法。
- Ni基合金からなる、樹枝状結晶組織の柱状結晶粒を有する中間体であって、
前記Ni基合金は、質量百分率で、10〜16%のCr、4.5〜7.5%のAl、2.8〜6.2%のMo、0.8〜4%のNb+Ta、0.01〜2%のTi、0.01〜0.3%のZr、0.01〜0.3%のCを含有し、
前記樹枝状結晶組織の一次樹枝状結晶の枝の間隔が3μm未満であり、
前記柱状結晶粒の長手方向と直交する切断面における{100}面の配向率が40%以上である、中間体。 - Ni基合金からなる、非樹枝状結晶組織の柱状結晶粒を有する造形体であって、
前記Ni基合金は、質量百分率で、10〜16%のCr、4.5〜7.5%のAl、2.8〜6.2%のMo、0.8〜4%のNb+Ta、0.01〜2%のTi、0.01〜0.3%のZr、0.01〜0.3%のCを含有し、
前記柱状結晶粒の長手方向と平行な切断面で観測される各柱状結晶粒の形状を同面積の楕円形に近似したときの短軸長の平均に対する長軸長の平均の比であるアスペクト比が4.0以上である、造形体。 - Ni基合金からなる、非樹枝状結晶組織の柱状結晶粒を有する造形体であって、
前記Ni基合金は、質量百分率で、10〜16%のCr、4.5〜7.5%のAl、2.8〜6.2%のMo、0.8〜4%のNb+Ta、0.01〜2%のTi、0.01〜0.3%のZr、0.01〜0.3%のCを含有し、
前記柱状結晶粒の長手方向と直交する切断面における{100}面の配向率が40%以上である、造形体。
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