Establishment of a method for quantitative evaluation of microstructures by serial sectioning using X-ray CT

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05146
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26050:Material processing and microstructure control-related
• Research Institution: Muroran Institute of Technology
• Principal Investigator: Kusumoto Kenta 室蘭工業大学, 大学院工学研究科, 准教授 (30764998)
• Co-Investigator(Kenkyū-buntansha): 清水 一道 室蘭工業大学, 大学院工学研究科, 教授 (60206191)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: エロージョン摩耗 / 高クロム白鋳鉄 / 炭化物の微細化 / X線CT

Outline of Final Research Achievements

In this study, carbide morphology was observed using X-ray CT to quantitatively evaluate the effect of carbides on wear resistance. High-chromium white cast iron was used as the basic composition, and the carbon content was varied from 3.0% to 4.0 mass% and the titanium content from 0 to 2.0 mass%. X-ray CT showed that the carbide grain size ranged from 5 to 30 μm, decreasing with increasing titanium content. The dominant factors in high temperature erosion wear are carbide area fraction, carbide type, and high temperature hardness, but these factors have little effect in this cast iron family. On the other hand, a correlation was observed between the primary carbide grain size and wear rate. It was found that the wear resistance increase as carbide grain size decrease. Therefore, it is clear that the primary carbide grain size has a significant effect on wear resistance.

Free Research Field

材料工学

Academic Significance and Societal Importance of the Research Achievements

炭化物形態は粉体衝突時の塑性変形を抑制させる効果があり，中でも炭化物粒径が耐摩耗特性向上に寄与していることを定量的に明らかにしたことは，今後の耐熱耐摩耗合金開発における合金設計および微細組織観察手法として価値がある．今後，炭化物粒径のみならず，分布や体積を統計処理し，定量評価を試みることで，将来的に様々なニーズに応じた最適合金設計が可能となり，耐摩耗材料の新たな品質評価手法となり得る．