The tip crack is not only relevant to the ocide inclusions, but also concerns with the freecementite formed by inappropriate teat treatment,the higher annealing temperature and the longer time.

• 搓丝尖裂除与材料中氧化物夹杂存在有关外,还与热处理不当,退火温度偏高,时间较长而形成游离渗碳体有关。