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熱處理對Ti46Al4Nb1Cr0.2B合金相和等溫?zé)釅嚎s行為的影響
發(fā)布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-09-09
通過改變TiAl合金的相分布，實現(xiàn)在低溫區(qū)對TiAl合金的熱加工。TiAl合金經(jīng)過不同熱處理過程得到不同的相分布，隨后在共析溫度下對合金進行等溫壓縮，觀察應(yīng)力和組織變化，利用退火消除變形組織。
熱處理對Ti46Αl4Nb1Cr0.2B合金相和等溫?zé)釅嚎s行為的影響Effects of heat treatment on phase and isothermal compression behavior of Ti46Αl4Nb1Cr0.2B alloy
通過改變TiAl合金的相分布，實現(xiàn)在低溫區(qū)對TiAl合金的熱加工。TiAl合金經(jīng)過不同熱處理過程得到不同的相分布，隨后在共析溫度下對合金進行等溫壓縮，觀察應(yīng)力和組織變化，利用退火消除變形組織。經(jīng)6 ℃/min升溫，在1 340 ℃保溫15 min，并空冷處理后的合金和經(jīng)12 ℃/min升溫，在1 340 ℃保溫15 min，并空冷處理后的合金的最大應(yīng)力比合金鑄錠的小，而且試件沒有開裂。在α相轉(zhuǎn)變溫度附近對等溫壓縮后的合金進行退火，合金的變形組織消失，而在再結(jié)晶溫度附近進行退火的合金的變形組織沒有完全消失。相的分布可以影響TiΑl合金在低溫區(qū)的熱加工性能，而完全消除變形組織應(yīng)在α相轉(zhuǎn)變溫度附近進行退火。
Hot workability of TiAl alloys at low temperatures was improved by changing the phase distribution of TiAl alloys. The alloys were compressed below eutectoid temperature and annealed. The stress and microstructure were observed by scanning electron microscope. TiAl alloy has different phase distributions after different heat treatments. The maximum stress of ingot is higher than that of alloy which has been heated with cooling rate of 6 ℃/min and treated in 1 340 ℃ for 15 min and finally cooled in air to RT as well as alloy which has been heated with cooling rate of 12 ℃/min and treated in 1 340 ℃ for 15 minutes and cooled to RT during isothermal compression process. The crack is not observed in these alloys. The deformation microstructure of alloy disappears after annealing near α phase transition temperature and can be observed after annealing near the recrystallization temperature. The phase distribution affects hot workability of alloy at low temperatures and the annealing near α phase transition temperature completely eliminates the deformation microstructure.
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