牛焱
,
晏人芸
腐蚀学报（英文）
研究了纯Fe、纯Y、Fe-15Y和Fe-30Y合金在600～800℃高硫压(10-3Pa)-低氧压(10-19Pa于600℃或10-15Pa于700℃和800℃)混合气中的腐蚀行为.Y在600℃和700℃发生加速腐蚀,但在800℃形成的腐蚀膜有保护性.加入Y能够降低合金的腐蚀速率,但在所有条件下,合金都形成FeS最外层膜、由两金属的化合物组成的中间层和由α-Fe和Y的硫氧化物的细微混合物所组成内硫化-氧化区.Fe似以相当高的速率穿过中间层形成FeS外层.在合金/氧化膜界面内侧不产生Y的贫化现象.从Y在Fe
关键词:
Fe-Y合金
,
yttrium
,
sulfidation
,
oxidation
曹铁梁
,
潘辉英
,
董荷花
,
张允书
中国腐蚀与防护学报
研究了Ｆｅ－２０Ｃｒ－５Ａｌ和Ｆｅ－２０ＣｒＳＡｌ－０．５Ｙ合金在１２００℃ｌａｔｍＳＯ２气氛中热循环条件下的高温腐蚀行为，并与恒温腐蚀相比较．测定了腐蚀动力学曲线，观察腐蚀产物表面，横截面和脆断断口的形貌，并分析元素的分布，确定腐蚀产物相组成．结果表明，在５０００小时实验周期内，不含钇的合金遭受氧化／硫化腐蚀，腐蚀动力学呈直线规律．含钇合金只发生高温氧化反应，腐蚀动力学与恒温腐蚀时的差别不大，仍大体符合抛物线规律．加钇有效地抑制了Ａｌ３＋在α－Ａｌ２Ｏ３中的扩散，合金表面氧化膜依赖氧的传质而成长，发展出粘着性好的柱状晶，在交变热应力作用下不易开裂和剥落，显著提高了合金的耐蚀性．
关键词:
Ｆｅ－Ｃｒ－Ａｌ合金
,
high temperature corrosion
,
yttrium
C.B. Xiao
,
Y.F. Had and X.A. Zhang (Cast Superalloys Lab.
,
Beijing Institute of Aeronautical Materials (BIAM)
,
Beijing 100095
,
China)
金属学报(英文版)
The effect of different amounts of silicon on the microstructure of the yttrium modified Ni3Al base alloy IC6 was studied with transmission electron microscope (TEM). The chemical compositions of phases formed due to the presence of silicon and yttrium were analyzed with energy dispersive spectrum(EDS) technique of electron probe microstructural analysis (EPMA). The results showed that a bulk shape phase rich in Mo and Si was formed in the alloys with addition of 0.10-0.20wt%Si and 0.12wt%Y, and that a needle like phase named Y-NiMo was precipitated in the interdendritic area in the alloy with addition of 0.30wt%Si and 0.12wt%Y besides the formation of the bulk shape phase mentioned above. The stress rupture properties under 1100℃/80MPa and the thermal fatigue properties at 1100℃ were improved by adding 0. 12wt%Y but decreased by adding 0.10-0.30wt%Si and 0.12wt%Y. The addition of 0. 10-0.20wt%Si and 0.12wt%Y has no obvious influence on the tensile properties of alloy IC6 at room temperature (R. T.), 760, and 900℃, respectively.
关键词:
silicon
,
null
,
null
,
null
,
null
