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2022 Fiscal Year Final Research Report

Nondestructive In-situ Inspection for Laser Quenching to Carbon Steel using AE Method

Research Project

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Project/Area Number 19K05087
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 26050:Material processing and microstructure control-related
Research InstitutionAnan National College of Technology

Principal Investigator

Yasuda Takeshi  阿南工業高等専門学校, 創造技術工学科, 准教授 (70610468)

Project Period (FY) 2019-04-01 – 2023-03-31
Keywordsレーザ焼入れ / アコースティックエミッション / AE / マルテンサイト変態 / 非破壊検査 / その場検査
Outline of Final Research Achievements

Laser hardening experiments were conducted to chromium molybdenum steel specimen, and Acoustic Emission (AE) due to martensitic transformation were detected by AE sensor. Microstructural observation of the hardened part (HAZ) was conducted to confirm the formation of martensitic structure inside the HAZ. The volume of the HAZ was measured and calculated, and the relationship between the volume and the laser power was clear. The hardness of the HAZ increased as a result of laser quenching, therefore confirmed again the formation of martensitic microstructure. The high correlation between the detected AE wave energy and the calculated HAZ volume indicates the possibility of nondestructive in-situ observation of the formation of HAZ and martensitic structure by laser hardening using AE.

Free Research Field

非破壊検査,AE法,機械材料

Academic Significance and Societal Importance of the Research Achievements

本研究に近いものとして、YAGレーザによる鋼への表面焼入れと焼入れ状態の評価にAEを適用した関連研究がある。ただし「焼入れ部分の硬さを非破壊的に検査する方法としてAEは有効」との結論であり、本研究が達成したレーザ焼入れの体積とAEとの関係性は示されていない。海外では過去にスポット溶接部のマルテンサイト組織生成についてAE観察を実施した研究(S.M.C.van Bohemen et al., J of Phys. D Applied Physics, Vol.34 (2001), pp.3312-3317)が発表されているが、本研究はレーザ焼入れに着目しており新規性を有する結果を残している。

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Published: 2024-01-30  

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