Characterization of ferrite-austenite boundary region of duplex stainless steels by SAES
Characterization of ferrite-austenite boundary region of duplex stainless steels by SAES
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DOI：
10.1149/1.1796447
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发表时间：
2004-01-01
影响因子：
3.9
通讯作者：
Leygraf, C
中科院分区：
文献类型：
--
作者：
Femenia, M;Pan, J;Leygraf, C
扫描俄歇电子能谱 (SAES) 用于研究三种双相不锈钢中铁素体和奥氏体之间的相界区域。在研究的元素中，Cr和Mo分配到铁素体相，而Ni和N分配到奥氏体相。跨相界的成分梯度发生在几微米内。结果与先前通过互补技术获得的相同相边界区域的结果一致。它们形成了铁素体和奥氏体相之间电偶相互作用的证据，并表明这是与奥氏体相相邻的铁素体较高的初始溶解速率的主要原因。合金元素的添加提高了铁素体相和奥氏体相的耐腐蚀性能，较弱的部位得到了相对强化。在高合金双相不锈钢中，合金元素也被分配，但两相的耐腐蚀性非常相似，从而导致均匀的溶解行为。 (C) 2004 年电化学协会。
Scanning Auger electron spectroscopy (SAES) has been used to investigate the phase boundary region between ferrite and austenite in three duplex stainless steels. Of the elements investigated Cr and Mo are partitioned to the ferrite phase, while Ni and N are partitioned to the austenite phase. The composition gradient across the phase boundary occurs within a few micrometers. The results are in accordance with previous results of the same phase boundary region obtained with complementary techniques. They form evidence of galvanic interaction between the ferrite and austenite phases and suggest this to be the main cause of the higher initial dissolution rate of ferrite adjacent to the austenite phase. The addition of alloying elements improves corrosion resistance of both the ferrite and austenite phases, the weaker sites are comparatively more strengthened. In the highly alloyed duplex stainless steel, the alloying elements are also partitioned, but in such a way that the corrosion resistance of the two phases is very similar, which results in a homogeneous dissolution behavior. (C) 2004 The Electrochemical Society.