研究结果表明，随钢组织在预加载荷中产生的微孔洞初始损伤量的增加，其延性起裂韧性降低。
The results showed that with increasing the amount of the initial void damage, the ductile fracture initiation toughness of steel decreases.
超级钢的主要特征是高洁净度和超细晶粒组织，在不增加任何合金元素的情况下，其强度、韧性和使用寿命提高一倍。
Ultra steel is characterized by its higher cleanness and ultra-fine grain, thus it has higher strength, toughness and longer life even without addition of more alloying elements.
本发明的优点是：可有效增加堆焊合金中的石墨数量，同时减少基体组织的含碳量并提高其合金化程度和基体的强韧性。
The present invention has the advantages of effective increasing of graphite in pile-up alloy, reduced carbon content in the base tissue, raised alloying degree and raised toughness.
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