440MPa级10MnNiCrMoV钢板裂纹分析

采用金相显微镜、扫描电镜及能谱仪等分析设备,研究了440MPa级10MnNiCrMoV钢板裂纹产生的原因.结果表明,裂纹附近钢板组织、硬度与基体相同,而裂纹表面存在大量氧化物,可断定该缺陷来源于连铸坯端部的某种缺陷,通过轧制经延展形成.

Analysis on Cracking of 440 MPa 10MnNiCrMoV Steel Plate

Cracking of 440 MPa 10 MnNiCrMoV steel plate was investigated by using analytical equipment such as optical microscopy, scanning electron microscopy and energy dispersive X-ray spectrometer. Results show that the microstructures and hardness adjacent to the cracks were the same with those of the base steel, and a lot of oxides were found on the fracture surface. It is concluded that the defect is herited from a defect in the end of the continuous casting billet and formed in the extension process of plate rolling.