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Si对Ti-600合金热稳定性能的影响
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-08-29
研究Ti-600合金d 140 mm镦制饼材固溶时效(STA)处理以及600 ℃热暴露100 h后毛坯热暴露与试样热暴露试样的室温拉伸性能，结合显微组织等的分析，探讨析出的硅化物对合金热稳定性能的影响。
Si对Ti-600合金热稳定性能的影响Influence of element Si on thermal stability of Ti-600
alloy
研究Ti-600合金d 140 mm镦制饼材固溶时效(STA)处理以及600 ℃热暴露100
h后毛坯热暴露与试样热暴露试样的室温拉伸性能，结合显微组织等的分析，探讨析出的硅化物对合金热稳定性能的影响。结果表明：经600 ℃热暴露100
h后，毛坯热暴露试样的强度较STA的稍有提高，伸长率减少20.4%。试样热暴露试样的抗拉强度降低1%左右，伸长率降低49%左右。在600 ℃热暴露100
h的过程中，合金内析出杆状不均匀分布的S2型硅化物，可使合金高温长时暴露后的塑性明显下降。
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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