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通过采用一系列技术措施,解决了长期妨碍Fe-Cr-Al-Y合金制备的工艺难题,冶炼时钇的回收率达60~80%,热锻时铸锭碎裂的情况不再发生。研制的Fe-20Cr-4Al-0.4~0.8Y合金高温寿命与普通Fe-Cr-Al相近,但其高温变形较小,而且室温塑性好(δ≥23%),强度低(σ_b-600MP_a)具有良好的拨丝、缠绕能力。此外,该合金高温脆化和晶粒长大的倾向极小,这一重要特性克服了普通Fe-Cr-Al合金的致命弱点,为取代昂贵的Ni_(30)Cr_(20)合金,为发展无脆化危险的铁素体基高温结构材料提供了可能。 相似文献
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In Fe-20Cr-4Al-Y alloys with (0.13~0.73) wt% Y,Y-containing phase was observed.Its Y content andcrystal structure were identical with those Of YFe_9 phase basically,and microhardness was 4~5 times higherthan that of α-phase matrix.The phase can strongly prevent grain growth and dislocation annihilation,and trapimpurity atoms,as a result,and inhibit the embrittlement caused by treating over 1000℃. 相似文献
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In Fe-20Cr-4Al-0.5Si-(0.13-0.73)Y alloys,anew phase consisting of 15.8 wt-% Y,65.4wt-% Fe,12.6 wt-% Cr,4.4 wt-% Al and 1.4wt-% Si was observed with its Y-content and crys-tal structure being identical with those ofYFe_9 phase basically and the microhardness being4-5 times higher than that of α-phase matrix.It is akind of stable particles (2-10 μm) dispersed overthe matrix.For Y-free or less alloy,the plasticity droppedsharply after high temperature treatment,while theplasticity is retained for the alloys containing0.41-0.73 wt-% Y treated below 1340℃,becausethe Y-containing particles can strongly preventfrom grain growth,and dislocation annihilation,and trap impurities.If treatment temperature ishigher than 1340℃,however,these actions will dis-appear owing to the melting of the particles. 相似文献
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低脆性FeCrAlY电热合金的研制 总被引:1,自引:0,他引:1
Fe-15Cr-4Al-Y合金克服了FeCrAl合金的高温脆化和475℃脆性,热强性和冷加工性也明显改善,FeCrAl使用温度高,抗氧化性好等优点则得到保留。还研制了使用温度更高的Fe-20Cr-4Al-Y和Fe-25Cr-4Al-Y合金,形成了低脆性合金系列。加入强化元素能进一步提高合金的热强性,用轻稀土元素代替Y则能降低生产成本。合金生产中的工艺困难已经解决,现已投入批量生产。合金用于电热、电阻元件,耐热结构件和耐高温涂层。用它代替Ni—Cr系合金可降低元件成本,提高其使用温度和服役寿命。 相似文献
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