LPBFで加工されたK418超合金における固化裂解を緩和するには,基板を予熱し,層厚度を最適化します
Deqin Zhao1, Jie Pei1, Chenxue Ma1
1Key Laboratory for Light-Weight Materials, Nanjing Tech University, Nanjing 210009, China.
Materials (Basel, Switzerland)
|February 13, 2026
まとめ
K418ニッケルベースの超合金によるレーザー粉末床融合 (LPBF) を最適化するには,特定のプロセスパラメータが必要です. 350°Cの基板の前加熱温度は,クラークを最小限に抑える部品製造のための固化クラッキングを効果的に最小化します.
科学分野:
- 材料科学 材料科学とは
- アディティブ製造 アディティブ製造
- メタルルジーは,金属の製造業です.
背景:
- 固化クラッキングは,ニッケルベースの超合金によるレーザー粉床融合 (LPBF) の重要な欠陥です.
- ニッケル基の超合金K418は,添加物製造中にホットクラッキングが起こりやすい.
- プロセスパラメータの制御は,高密度,欠陥のないコンポーネントを達成するために不可欠です.
研究 の 目的:
- 層の厚さと基板の予熱が,K418合金のLPBFの固化裂けに及ぼす影響を体系的に調査する.
- ホットクラッキングを最小限に抑えるための最適なプロセスパラメータを特定する.
- クラッキングの基礎となる微細構造的メカニズムを理解する.
主な方法:
- レーザー粉末床融合 (LPBF) は,K418ニッケルベースの超合金サンプルを製造するために使用されました.
- 異なる層の厚さ (30 μm,60 μm) と基板の前加熱温度 (200 °C,350 °C) を採用した.
- 裂け目の拡散と微細構造の特徴を調べるために,顕微鏡分析 (例えば,光学顕微鏡,SEM) を行いました.
- 相対密度測定が行われました.
主要な成果:
- 350°Cの予熱で30μmの厚さの層と60〜80J/mm3の体積エネルギー密度 (VED) は,クラッキングを効果的に抑制し, >99%の相対密度を達成しました.
- 200°Cまでの予熱は,限られたクラック抑制を提供した.
- 60μmの層厚さでは,前加熱が有害になり,熱蓄積と収縮ストレスによる亀裂が増加しました.
- 高角粒子の境界に沿って広がった裂け目が,低融点元素分離 (O,B,Si,C) と関連しています.
結論:
- 350 °Cの基板の前加熱は,K418合金のLPBFにおける固化クラッキングを緩和するための重要なパラメータです.
- 適度なVEDと組み合わせた最適な予熱と層の厚さは,高密度,クラークを最小限に抑えたK418コンポーネントの生産を可能にします.
- 熱ストレスと粒子の境界分離の役割を理解することは,LPBF超合金におけるクラッキングを制御するための鍵です.
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