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Si對(duì)Ti-600合金熱穩(wěn)定性能的影響
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更新時(shí)間：2015-08-29
研究Ti-600合金d 140 mm鐓制餅材固溶時(shí)效(STA)處理以及600 ℃熱暴露100 h后毛坯熱暴露與試樣熱暴露試樣的室溫拉伸性能，結(jié)合顯微組織等的分析，探討析出的硅化物對(duì)合金熱穩(wěn)定性能的影響。
Si對(duì)Ti-600合金熱穩(wěn)定性能的影響Influence of element Si on thermal stability of Ti-600
alloy
研究Ti-600合金d 140 mm鐓制餅材固溶時(shí)效(STA)處理以及600 ℃熱暴露100
h后毛坯熱暴露與試樣熱暴露試樣的室溫拉伸性能，結(jié)合顯微組織等的分析，探討析出的硅化物對(duì)合金熱穩(wěn)定性能的影響。結(jié)果表明：經(jīng)600 ℃熱暴露100
h后，毛坯熱暴露試樣的強(qiáng)度較STA的稍有提高，伸長率減少20.4%。試樣熱暴露試樣的抗拉強(qiáng)度降低1%左右，伸長率降低49%左右。在600 ℃熱暴露100
h的過程中，合金內(nèi)析出桿狀不均勻分布的S2型硅化物，可使合金高溫長時(shí)暴露后的塑性明顯下降。
Ti-600 alloy pancake with the diameter of 140 mm was
upset and was solutioned at 1 020 ℃ for 1 h, aged at 650 ℃ for 8 h, air cooling.
The tensile properties of specimen were tested at ambient temperature for the
alloy prior to and after being exposed at 600 ℃ for 100 h. Microstructures for
the alloy were observed. And the influence of silicides on thermal stability was
also analyzed. The results indicate that for the alloy exposed at 600 ℃ for 100
h, the strength of the sample without oxidizing layers increases a little bit,
the elongation decreases by 20.4%. While for the sample with oxidizing layers,
the strength decreases by 1% or so, the elongation decreases by about 49%. The
abrupt decrease of the plasticity is caused by the precipitation of rod-like
S2 typed silicides in the alloy during the process of thermal
exposure.
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