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采用电弧熔炼法制备了B含量为0到2at.%的Nb-Ti-Si基超高温合金。分析了B对Nb-Ti-Si基超高温合金的电弧熔炼态组织及氧化行为的影响。电弧熔炼态Nb-22Ti-16Si-6Cr-3Al-4Hf合金由(Nb,Ti)ss,β-(Nb,Ti)5Si3和γ-(Nb,Ti)5Si3组成,而Nb-22Ti-16Si-6Cr-3Al-4Hf-1B和Nb-22Ti-16Si-6Cr-3Al-4Hf-2B合金则由(Nb,Ti)ss,α-(Nb,Ti)5Si3和γ-(Nb,Ti)5Si3组成。Nb-Ti-Si基超高温合金主要是通过界面和(Nb,Ti)ss发生氧化的,在添加B的合金中,B明显降低了其在1200℃前50小时的氧化速率,但50小时后,B的添加反而降低了合金的抗氧化性。
The Nb-Ti-Si based superalloy with B content of 0 to 2 at.% Was prepared by arc melting method. The effect of B on the microstructure and oxidation behavior of Nb-Ti-Si-based superalloy was analyzed. The arc-melting Nb-22Ti-16Si-6Cr-3Al-4Hf alloy consists of (Nb, Ti) ss, β- (Nb, Ti) 5Si3 and γ- (Nb, Ti) -3Al-4Hf-1B and Nb-22Ti-16Si-6Cr-3Al-4Hf-2B alloys consist of (Nb, Ti) ss, α- (Nb, Ti) 5Si3 and γ- (Nb, Ti) 5Si3. The Nb-Ti-Si-based superalloy is oxidized mainly through the interface and (Nb, Ti) ss. In B addition, B significantly reduces its oxidation rate at 1200 ° C for 50 hours, but after 50 hours The addition of B, on the contrary, reduced the oxidation resistance of the alloy.