Fe-Ni-Cr-W-Mo系750℃与900℃部分相区图

Partial Isothermal Sections of Phase Diagram at 750℃ and 900℃ in FeNiCr-W-Mo System

用X-线与电子衍射方法测定Fe-Ni-Cr-W-Mo系75O°C与900℃部分相区图,得出在750℃与900℃时,当含钼量分别大于1.5％与1.0%时就可以产生μ相。在实验合金成分范围内,900℃时,当Mo含量不定,含W量>7%时就可以产生μ+Laves相,而750℃时不管W、Mo含量多少都不会产生Laves相。另外,证明传统的控制μ相生成的电子空们数Nv=2.30,不适合本系统合金。

The partial isothermal sections of phase diagram at 750℃ and 900℃ in FeNiCr-W-Mo system have been determined by X-ray and TEM methods. Experimental results show, that when the content of Mo% is higher than 1.5% and 1.0% the μ phase can be formed at 750℃ and 900℃ respectively. When the content of tungsten is higher than 7% the μ and Laves phase can be formed at 900℃ in the chemical composition regime of tested alloys, however the Laves phase can not be formed at 750 ℃ regardless of the total amount of tungsten and molybdenum. In addition, experimental results have also proved that the traditional electron vacanr number Nv = 2.30 for μ phase formation can not be vised in the investigated system.