API X80管线钢异常碳化物形成机理Formation mechanism of abnormal carbides in API X80 pipeline steel
孙华,孙彦辉,王帅,孙瑞虹,唐晋,孔祥华,李翔,王发仓,李士琦
摘要(Abstract):
针对API X80管线钢在生产实际中遇到的落锤性能较低的问题进行了分析。结果表明,该管线钢在落锤撕裂试样断口处存在大量的异常球形析出物,这些析出物为Mo、Ti、Ni等合金元素的碳化物,尺寸约为几个微米,不但削弱了这些合金元素在钢中的弥散强化作用,而且降低了管线钢的落锤撕裂性能。结合热处理实验,探讨了这些异常长大碳化物的生成机理,即钢板的冷却速度影响碳的扩散,并最终对碳化物的形成产生决定性的作用。减少析出物较好的办法是终轧后空冷至碳化物形成温区的上限附近,然后再强制水冷,保证钢板快速通过碳化物形成区间,从而抑制碳化物的异常长大行为。
关键词(KeyWords): 管线钢;落锤性能;碳化物;固相扩散
基金项目(Foundation): 国家自然科学基金(50771021)
作者(Author): 孙华,孙彦辉,王帅,孙瑞虹,唐晋,孔祥华,李翔,王发仓,李士琦
DOI: 10.13289/j.issn.1009-6264.2011.06.010
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