It was analyzed by means of metallographical examination, chemical composition analysis and inclusion testing, the results show that the fracture was mainly caused by no-metallic inclusion.

• 通过对层裂坯料进行宏、微观检验、化学成分和夹杂物分析,认为大颗粒硫化物夹杂及其富集破坏了基体的连续性,是镦制过程中产生裂纹的主要原因。