기계적인 압입과 Nd:YAG 레이저 펄스조사에 의한 3% Si 방향성 전기강판의 변형기구와 철손에 미치는 영향 = Effects of Mechanical indentation and Pulsed Nd:YAG Laser Irradiation on Deformation Mode and Core Loss in Grain-oriented 3 % Si Steel Sheet

다국어 초록 (Multilingual Abstract)

The efffcts of mechanical indentation on the deformation mode and core loss of 3% Si steel sheet were compared to that by the pulsed Nd YAG laser irradiation. Some of electropolished specimens were indented with the Rockwell hardness diamond brale and others were irradiated with Q-switched Nd : YAG laser pulses. The slip lines and defect structures were investigated by the optical microscopy and TEM respectively. the effect of annealing of both specimens at 1000 C for 2 hours on the core loss was investigated. $lt;111$gt; slips on {110} planes were the most predominant slip systems for both cases. However, some slip systems other than {110}$lt;111$gt; systems were activated in the laser-irradiated specimen, probably due to the thermal effect of the laser-induced deformation. Increase of the dislocation density by the mechanical indentation was greater than by the laser-irradiation. Dislocations assumed a specific direction in both specimens. These elongated dislocations and the stress fields induced by them are believed to be related closely with the reduction of the magnetic domain wall spacing in the 3% Si steel sheet. Annealing of the mechanically indented specimen at 1000℃ for 2 hours has returned the reduced core loss to the original value. While annealing of the laser-irradiated specimen has not changed the reduced core loss.

목차 (Table of Contents)

• 1. 서론
• 2. 실험방법
• 시편준비
• 기계적인 압입과 레이저 조사
• 3. 실험결과 및 검토
• 기계적인 압입에 의한 변형
• 시편내부의 미세조직 관찰
• 철손에 미치는 응력제거 열처리의 영향
• 4. 결론