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通过SEM、TEM和相应的力学性能测试,研究X100级管线钢应变时效前后微观组织及其力学性能的变化.结果表明,在相同的温度、时间条件下时效,随着应变量的增加,针状铁素体和粒状贝氏体组织均发生形变,同时基体上的M/A组织周围形成高密度的位错,成为微裂纹的形核核心,并在温度时效的作用下导致间隙原子的偏聚.应变时效2%后,管体的拉伸强度虽没有较大变化但其均匀伸长率明显降低.应变时效后管体材料的冲击断口上二次裂纹增多,冲击韧性显著降低.

参考文献

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