Diffusion and Interaction of W and Re in Fe-Cr Alloys
Diffusion and Interaction of W and Re in Fe-Cr Alloys
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DOI：
10.4028/www.scientific.net/ddf.258-260.231
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发表时间：
2006-10
影响因子：
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通讯作者：
Y. Murata;Tomonori Kunieda;K. Yamashita;T. Koyama;Effendi;M. Morinaga
中科院分区：
文献类型：
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作者：
Y. Murata;Tomonori Kunieda;K. Yamashita;T. Koyama;Effendi;M. Morinaga
耐热钢中耐火元素的扩散系数是研究耐热钢蠕变过程中微观组织稳定性的关键。本研究的目的是估计Fe-Cr合金作为高铬铁素体钢中bcc基体相的基体合金的扩散率，并研究Re对W扩散率的合金化影响。采用Fe-15Cr和Fe-20Cr二元合金、Fe-15Cr- 5re、Fe-15Cr- 5w、Fe-20Cr- 5re三元合金[摩尔%]。基于改进的三元Boltzmann-Matano方法，得到了Fe-Cr-Re三元体系的相互扩散系数。re掺杂Fe-Cr-W合金的表观互扩散系数约为re未掺杂Fe-Cr-W合金的五分之一。结果表明，Re的存在显著延缓了W在Fe-15mol%Cr基合金中的扩散。这可能是少量添加Re抑制含W高铬铁素体钢组织演变的主要原因。
The diffusivity of refractory elements in heat resistant steels is crucial for the basic understanding of the microstructural stability during creep. The purposes of this study are to estimate the diffusivity in Fe-Cr alloys as a base alloy for the bcc matrix phase in high Cr ferritic steels and also to investigate the alloying effect of Re on the W diffusivity in them. Fe-15Cr and Fe-20Cr binary alloys, Fe-15Cr-5Re, Fe-15Cr-5W, Fe-20Cr-5Re ternary alloys [mol%] were used in this study. On the basis of the modified ternary Boltzmann-Matano method, the interdiffusion coefficients were obtained in Fe-Cr-Re ternary system. The apparent interdiffusion coefficient for the Re-doped Fe-Cr-W alloy was about one fifth of that for the Re-free alloy. It is concluded that the existence of Re retarded significantly the W diffusion in Fe-15mol%Cr based alloy. This is probably the main reason why a small amount of Re addition suppress the microstructural evolution of W containing high Cr ferritic steels.