Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第z1期    总第1期    2013年12月

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文章编号:1004-0609(2013)S1-0148-05
Si对Ti-600合金热稳定性能的影响
曾立英,洪 权,赵永庆,戚运莲

(西北有色金属研究院,西安 710016)

摘 要: 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。

 

关键词: Ti-600合金;热暴露;热稳定;硅化物;塑性

Influence of element Si on thermal stability of Ti-600 alloy
ZENG Li-ying, HONG Quan, ZHAO Yong-qing, QI Yun-lian

Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China

Abstract: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.

 

Key words: Ti-600 alloy; thermal exposure; thermal stability; silicides; plasticity

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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