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固溶處理對Ti2448合金低周疲勞性能的影響
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更新時間：2015-09-08
研究室溫下固溶處理對熱軋態(tài)Ti-24Nb-4Zr-8Sn(簡稱Ti2448)合金在應變控制(R=0.1)下的低周疲勞性能的影響。
固溶處理對Ti2448合金低周疲勞性能的影響Effects of solid solution treatment on low cycle fatigue performance of Ti2448
研究室溫下固溶處理對熱軋態(tài)Ti-24Nb-4Zr-8Sn(簡稱Ti2448)合金在應變控制(R=0.1)下的低周疲勞性能的影響。結果表明：合金經(jīng)(750℃，30 min)固溶處理后(簡稱SS)，形成再結晶組織，該組織比熱軋態(tài)合金的更均勻。與熱軋態(tài)合金相同，SS合金同樣具有超彈性。SS處理后，合金具有較高的低周疲勞壽命，并且在高應變幅下，其低周疲勞性能較熱軋態(tài)合金的好；而在低應變幅下，其低周疲勞性能比熱軋態(tài)合金的稍差。XRD分析表明，隨著應變幅的增加，α2相的析出含量增大。
The studies effects of solid solution treatment on low cycle fatigue (R=0.1) controlled by the strain properties of Ti-24Nb-4Zr-8Sn (Ti2448) alloy at room temperature was investigated. The result shows that the alloy after (750 ℃, 30 min) solid solution treatment (SS), the recrystallization organization forms, which is more uniform than that of the hot rolled state alloy. As the same as the hot rolled state alloy, the SS alloy also has super elasticity. After SS treatment, the alloy has the high life of low cycle fatigue (LCF), and presents higher LCF performance than that of hot rolled alloy at high strain amplitude. However, at low strain amplitude, the LCF performance of SS alloy is a bit poorer than that of hot rolled alloy. XRD analysis shows that with the increase of strain amplitude, the content of α2 precipitation increases.
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