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熱變形溫度對7085鋁合金組織和性能的影響
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-10-27
對7085鋁合金進行溫度范圍為350~450 ℃的恒應變速率熱壓縮實驗，模擬其工業等溫鍛造過程。采用金相顯微鏡、 掃描電鏡、力學性能測試、剝落腐蝕測試以及應力腐蝕開裂(SCC)測試技術研究熱變形溫度對7085鋁合金鍛件的顯微組織、力學性能、剝落腐蝕性能以及應力腐蝕性能影響。
熱變形溫度對7085鋁合金組織和性能的影響Effects of hot deformation temperature on?microstructure and properties of 7085 aluminum alloy
對7085鋁合金進行溫度范圍為350~450 ℃的恒應變速率熱壓縮實驗，模擬其工業等溫鍛造過程。采用金相顯微鏡、 掃描電鏡、力學性能測試、剝落腐蝕測試以及應力腐蝕開裂(SCC)測試技術研究熱變形溫度對7085鋁合金鍛件的顯微組織、力學性能、剝落腐蝕性能以及應力腐蝕性能影響。研究結果表明：在350和400 ℃下變形的合金在熱壓縮與壓縮后緩冷過程中未發生再結晶，而在420和450 ℃下變形的合金再結晶跡象明顯；7085變形態合金經固溶與時效處理后，合金時效態的再結晶程度以及平均晶粒尺寸隨變形溫度的升高而增大；7085合金時效態的室溫強度隨變形溫度升高而減小，塑性降低不顯著；不同溫度變形的7085合金的斷裂模式均為韌性斷裂；隨著變形溫度的升高，7085合金T6態的抗剝落腐蝕與抗應力腐蝕性能降低。
The isothermal hot compression tests of 7085 aluminum alloy were carried out at a constant strain rate and temperatures from 350 to 450 ℃ to simulate the isothermal forging process. The effects of hot deformation temperature on microstructure, mechanical properties , exfoliation corrosion property and stress corrosion property of 7085 alloy were investigated by optical microscope, scanning electron microscope, mechanical property testing, exfoliation corrosion and stress corrosion cracking testing. The results show that the recrystallization during the isothermal hot compression process and?subsequent?slow cooling is not activated when the alloy is deformed at 350 and 400 ℃, respectively.??However,?the recrystallization happens obviously?when the alloy is deformed at 420 and 450 ℃, respectively. After solution treatment and aging treatment, the recrystallization and mean grain size of the alloy increase with raising hot deformation temperature. With the increase of deformation temperature, the strength of aged 7085 alloy at room temperature decreases, but the elongation?decreases a little. The fracture models of all aged alloys deformed at different temperatures are ductile fracture. The exfoliation corrosion resistance and anti-stress corrosion cracking properties of peak-aged 7085 alloys decrease with the increase of deformation temperature.
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