Preparation and properties of some ODS Fe-Cr-Al alloys
Preparation and properties of some ODS Fe-Cr-Al alloys
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DOI：
10.1007/bf02646711
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发表时间：
1978-02
期刊：
影响因子：
--
通讯作者：
F. G. Wilson;B. Knott;C. DesForges
中科院分区：
文献类型：
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作者：
F. G. Wilson;B. Knott;C. DesForges
采用元素粉末、中间合金粉末和氧化物粉末的机械合金化方法，制备了Fe-25 Cr-6Al和Fe-25 Cr-11 Al（wt %）基合金，并分别添加Y、Al_2 O_3和Y_2 O_3。通过在1000°C下以36：1的压缩比挤出来固结粉末。所得氧化物含量均为约3体积%或8体积%的混合Al 2 O3-Y2 O3氧化物或Al 2 O3。合金在600°C下表现出相当大的延展性：含有3体积%氧化物的合金可以容易地温加工成片材而无需中间退火; 8体积%合金需要在1100°C下进行中间退火。挤压态合金经1450°C等温退火后，3vol%合金可再结晶，形成大的细长晶粒，但高温强度性能没有得到改善。然而，这些合金，连同一些8体积百分比的材料，可以更容易再结晶后，棒（或板）轧制，获得实质性改善的拉伸和应力断裂性能后，在620°C的9百分比杆轧制和等温退火2小时，在1350°C。在此条件下，所选合金在1000和1100°C下的断裂强度上级优于竞争性镍基和钴基高温合金。所有合金的抗氧化性能都很好。
Several alloys based on Fe-25Cr-6Al and Fe-25Cr-11Al (wt pct) with additions of yttrium, Al2O3, and Y2O3have been prepared by mechanical alloying of elemental, master alloy and oxide powders. The powders were consolidated by extrusion at 1000°C with a reduction ratio of 36:1. The resulting oxide contents were all approximately either 3 vol pct or 8 vol pct of mixed Al2O3-Y2O3oxides or of Al2O3. The alloys exhibited substantial ductility at 600°C: an alloy containing 3 vol pct oxide could be readily warm worked to sheet without intermediate annealing; an 8 vol pct alloy required intermediate annealing at 1100°C. The 3 vol pct alloys could be recrystallized to produce large elongated grains by isothermal annealing of as-extruded material at 1450°C, but the high temperature strength properties were not improved. However, these alloys, together with some of the 8 vol pct materials, could be more readily recrystallized after rod (or sheet) rolling; sub-stantially improved tensile and stress rupture properties were obtained following 9 pct rod rolling at 620°C and isothermal annealing for 2 h at 1350°C. In this condition, the rup-ture strengths of selected alloys at 1000 and 1100°C were superior to those of competitive nickel-and cobalt-base superalloys. The oxidation resistance of all the alloys was ex-cellent.