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.

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。

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Decreasing welding thermal input will decrease the oxygen content and the number and size of oxide inclusions, and it improves the toughness of weld metal.

降低焊接线能量时，将降低熔敷金属中的氧含量及其氧化夹杂物的数量和大小，从而提高熔敷金属的韧性。

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The number of effective IAF nuclei were inconsistent for different microalloying series, resulting the corresponding changes of the volume fraction of IAF in HAZ and strength and toughness of HAZ.

不同微合金化系列有效的IAF形核核心数量不同，导致HAZ组织中iaf体积分数和HAZ强韧性相应发生变化。

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But this year, the Number 48 team also showed its toughness.

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