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OALib Journal期刊
ISSN: 2333-9721
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含Nb-Ti低碳微合金钢中纳米碳化物的相间析出行为
DOI: 10.11900/0412.1961.2014.00582, PP. 417-424
Keywords: Nb-Ti微合金钢,相间析出,Vickers硬度,高分辨透射电子显微术,取向关系,错配度
Abstract:
采用热膨胀实验研究了等温温度对Nb-Ti微合金钢组织、性能及析出行为的影响规律,利用TEM对不同温度等温后试样的析出行为进行观察和分析.结果表明,不同温度等温后试样中均可观察到相间析出碳化物,且降低等温温度可显著细化相间析出碳化物所在面面间距、相间析出碳化物所在面内析出物间距及相间析出碳化物尺寸.具有层状分布特征的相间析出碳化物所在面呈现弯曲和平直2种形态,其中平直型相间析出碳化物所在面平行于铁素体的{011},{012},{013}和{035}面.经HRTEM确定相间析出碳化物具有NaCl型晶体结构,晶格常数为0.434nm,且与铁素体基体符合Baker-Nutting(B-N)关系,经EDS分析确定相间析出碳化物为(Nb,Ti)C.利用Orowan机制对析出强化量进行估算,结果表明不同等温温度下析出强化量均大于300MPa.
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