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機械学習とXAIを用いた鋼の結晶粒成長速度予測による機械的特性の向上
Selim Demirci1,2, Durmuş Özkan Şahin3, Sercan Demirci3
1Marmara University, Faculty of Engineering, Department of Metallurgical and Materials Engineering, Istanbul, Turkey.
PloS one
|January 16, 2026
まとめ
本研究では、鋼の結晶粒成長速度を予測する機械学習(ML)フレームワークを導入し、合金設計を改善する。XGBoostモデルは結晶粒径を正確に予測し、熱機械加工を最適化して機械的特性を向上させる。
科学分野:
- 材料科学; 金属学; 計算材料科学
背景:
- 鋼の機械的特性を最適化するには、熱機械加工中の結晶粒成長速度論の理解が必要です。従来のモデルでは、組成と加工パラメータ間の複雑な相互作用に対処するのが困難です。
研究 の 目的:
- オーステナイト結晶粒成長挙動を予測する新しい機械学習(ML)フレームワークを開発すること。正確な予測のために化学組成とプロセス条件を利用すること。
主な方法:
- 1039個の実験的に検証されたサンプルの包括的なデータセットが使用されました。ハイパーパラメータ最適化後、高いR2を達成したXGBoostアルゴリズムが採用されました。特徴選択とSHAP分析により、結晶粒成長に影響を与える主要なパラメータが特定されました。
主要な成果:
- XGBoostモデルはR2スコア0.9728を達成し、優れた予測能力を示しました。温度、初期結晶粒径、保持時間が主要な要因として特定されました。316Lステンレス鋼を用いた実験的検証では、予測値と測定値の間に強い一致が見られました。
結論:
- 本研究は、鋼の結晶粒成長速度を予測するための最初の統合されたMLと実験的アプローチを提示します。開発されたフレームワークは、合金設計とプロセス最適化のための強力なツールを提供します。今後の作業では、より多くの変数と合金系を含むようにフレームワークを拡張します。
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