Effect of alloying element content on ion-nitriding behavior of Fe-Ti alloys
Effect of alloying element content on ion-nitriding behavior of Fe-Ti alloys
复制标题
合金元素含量对Fe-Ti合金离子渗氮行为的影响
DOI：
10.1007/bf00664271
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发表时间：
1986
影响因子：
2.2
通讯作者：
S. Kikuchi
中科院分区：
文献类型：
--
作者：
J. Takada;Yuusuke Oizumi;H. Miyamura;H. Kuwahara;S. Kikuchi
钛含量在1.07和2.58wt.%之间的铁合金的离子渗氮行为在α相区进行了研究。结果表明，这种行为与铁合金的内氧化行为相似：在表面形成了一层很薄的γ′-Fe 4 N层和一层弥散分布着少量TiN沉淀的内氮化层。内氮化层的生长速率服从抛物线规律。根据内氧化速率方程讨论了内渗氮层的生长动力学，给出了氮在渗层中的扩散系数DNapp。测得的DNapp随着TiN的体积分数f的增加而减小，表明TiN沉淀物的存在明显抑制了氮的扩散。此外，通过外推DNappto f=0计算了氮在α-Fe中的扩散系数，与文献报道的结果一致。根据氮在α-铁中扩散的有效面积讨论了DNappf的依赖性。
The ion-nitriding behavior of iron alloys with a titanium content of between 1.07 and 2.58 wt.% was investigated in the α-phase region. The behavior was found to be analogous to the internal oxidation behavior of iron alloys: An internal-nitriding layer, where small TiN precipitates are dispersed, as well as a very thin surface layer of γ′-Fe4N were formed. A parabolic rate law holds for growth of the internal-nitriding layer. The kinetics of growth of the internalnitriding layer is discussed according to the rate equation of internal-oxidation, giving the diffusion coefficient of nitrogen, DNapp, in the layer. The measured DNappdecreases as the volume fraction of TiN, f, increases, indicating that the diffusion of nitrogen is apparently inhibited by the existence of TiN precipitates. Furthermore, the diffusion coefficient of nitrogen in α-iron was evaluated by extrapolating DNappto f=0, being in good agreement with that reported previously. The f-dependence of DNappis discussed in terms of the effective area for diffusion of nitrogen in α-iron.