高强度的高级淬火低温回火后具有良好的综合力学性能和低温冲击韧度。
Advanced high strength after quenching and tempering has good mechanical properties and low temperature impact toughness.
另外，随着加铋后石墨球的细化，低温冲击韧度数值波动变小，性能变得更加稳定。
Additionally, the fluctuations in low-temperature toughness are reduced by adding Bi to refine graphite sphere, the performance becomes more stable.
结果显示，适量的铋可以减小石墨球径，增加石墨球数量，提高球铁的低温冲击韧度。
The results show that appropriate amount of Bi can decrease the diameter of graphite sphere, increase the number of graphite sphere, strengthen the low-temperature toughness.
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