超低碳含铜微合金钢中时效析出相的晶体结构Crystal structure of fine age-precipitates in microalloyed ultra-low carbon Cu-bearing steel
尹桂全,杨才福,吕忆农
摘要(Abstract):
用高分辨电子显微镜(HREM)进行了Nb、Cr、Mo、Ni等微合金元素复合微合金化的实用超低碳含Cu钢中时效析出相的形貌观察及晶体结构鉴定,探索将HREM分析技术有效应用于工程材料微观结构研究的新途径。在300万倍以上的放大倍率下清晰观察到了尺寸仅有十个nm左右的细小弥散分布的时效析出颗粒以及其中的孪晶结构,还有大量在局部微区形成的过渡结构。尝试用单个颗粒HREM像上的晶格条纹间距鉴定了钢中除ε-Cu以外的另3类时效析出相的晶体结构。结果表明,时效期间钢中析出Cu、Nb、Cr、Mo、Ni的特殊碳化物(碳氮化物),与ε-Cu共同产生时效强化作用。提出了用HREM像对实用钢材中弥散分布的微细析出相进行晶体结构鉴定的实验方法。
关键词(KeyWords): 高分辨电子显微像(HREM);晶体结构;多元微合金化含铜钢;时效;碳化物(碳氮化物)
基金项目(Foundation): 科技部国家高新技术研究发展计划项目(2005AA305G70;2007AA03A228)
作者(Author): 尹桂全,杨才福,吕忆农
DOI: 10.13289/j.issn.1009-6264.2010.12.015
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