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OALib Journal期刊
ISSN: 2333-9721
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沉淀强化钢中两相区NiAl相和富Cu相的析出特点
DOI: 10.11900/0412.1961.2014.00118, PP. 1305-1310
Keywords: 残余奥氏体,马氏体,相界面,强化相,原子探针层析技术
Abstract:
沉淀强化钢在900℃固溶2h后水淬,500℃时效1h,利用原子探针层析技术(APT)研究了残余奥氏体和马氏体两相区强化相的析出特点.结果表明,残余奥氏体中没有析出相,马氏体和马氏体/残余奥氏体界面处均有强化相析出,马氏体中靠近界面处有一层析出贫化区.界面处强化相的等效半径和间距均大于马氏体中的强化相,界面处富Cu相和NiAl相中Cu,Ni和Al的含量均大于马氏体中的富Cu相和NiAl相,而且界面处富Cu相和NiAl相的分离趋势要大于马氏体,这是因为界面处存在大量缺陷,促进了强化相的长大,使得界面处和马氏体中的强化相处于长大的不同阶段.
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