CAJ | 학술논문

利用金相显微镜、扫描电镜、能谱分析仪对探伤不合格12Cr2Mo1R厚板的化学成分、微观组织、夹杂物等进行研究和分析。结果表明，板厚1/2处70μm以上呈串状的Al2 O3夹杂物是造成超声波探伤不合格的主要原因。分析了12Cr2Mo1R厚板中Al2O3夹杂物的主要来源。同时提出解决探伤不合格的方案：严格控制转炉冶炼时钢水中的溶解氧含量，减少脱氧Al的用量；采用合理的二次精炼制度，尤其是合理的吹氩制度，促进夹杂物的上浮分离；采用合理的浇注工艺，防止保护渣卷入。
이용금상현미경、소묘전경、능보분석의대탐상불합격12Cr2Mo1R후판적화학성분、미관조직、협잡물등진행연구화분석。결과표명，판후1/2처70μm이상정천상적Al2 O3협잡물시조성초성파탐상불합격적주요원인。분석료12Cr2Mo1R후판중Al2O3협잡물적주요래원。동시제출해결탐상불합격적방안：엄격공제전로야련시강수중적용해양함량，감소탈양Al적용량；채용합리적이차정련제도，우기시합리적취아제도，촉진협잡물적상부분리；채용합리적요주공예，방지보호사권입。
The chemical composition,microstructure,inclusion characters of the ultrasonic testing (UT) disqualified 12Cr1MoR plate were observed by using OM,SEM,EDS.The results indicated that the UT disqualification of the plate were mainly caused by Al2 O3 cluster (size over 70 μm )which located in the center of the plate.The origins of the Al2 O3 cluster were shown.The solutions to control the Al2 O3 inclu-sion formation were given:the solute oxygen in the steel of BOF(Basic Oxygen Furnace Steel Making) process need to be controlled;less Al should be added,when killing the steel;reasonable secondary refi-ning progress is necessary,especially pay attention to argon blowing to urge the rising of the inclusion;with adequate casting process to prohibit the slag entrapping.