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時效工藝對1933鋁合金鍛件腐蝕性能的影響
發(fā)布人：上海艾荔艾金屬材料有限公司www.85978597.cn
更新時間：2015-12-05
采用金相顯微鏡(OM)、透射電鏡(TEM)、慢應變速率拉伸(SSRT)、雙懸臂梁實驗(DCB)、晶間腐蝕實驗和剝落腐蝕實驗研究時效工藝對1933鋁合金鍛件抗應力腐蝕(SCC)、抗晶間腐蝕(IGC)和抗剝落腐蝕(EC)性能的影響。
時效工藝對1933鋁合金鍛件腐蝕性能的影響Effects of aging treatment on corrosion properties of?1933 aluminum alloy forging
采用金相顯微鏡(OM)、透射電鏡(TEM)、慢應變速率拉伸(SSRT)、雙懸臂梁實驗(DCB)、晶間腐蝕實驗和剝落腐蝕實驗研究時效工藝對1933鋁合金鍛件抗應力腐蝕(SCC)、抗晶間腐蝕(IGC)和抗剝落腐蝕(EC)性能的影響。結(jié)果表明：在T6(120 ℃，24 h)時效狀態(tài)下，1933鋁合金鍛件的應力腐蝕敏感性最強，應力腐蝕臨界應力強度因子KISCC僅為8.95 MPa·m1/2。經(jīng)(110 ℃，6 h)+(160 ℃，8 h)和(110 ℃，12 h)+(170 ℃，8 h)雙級時效后，KISCC分別上升至23.84和27.56 MPa·m1/2，鍛件的抗應力腐蝕性能顯著提高。而經(jīng)(110 ℃，12 h)+(180 ℃，6 h)時效后，抗應力腐蝕性能的提高伴隨著較大幅度的強度損失和塑性損失。鍛件在各時效狀態(tài)下，晶間腐蝕形式為點蝕，具有良好的抗晶間腐蝕性能。同時，鍛件具有良好的抗剝落腐蝕性能。T6時效時，鍛件的剝蝕等級為EC級；經(jīng)雙級時效后，其剝蝕等級均在EA+級以上。
The effects of aging treatment on the stress corrosion cracking resistance, intergranular corrosion (EC) resistance and exfoliation corrosion resistance of 1933 aluminum alloy forging were investigated by means of optimal microscopy (OM), transmission electron microscopy (TEM), slow strain rate testing (SSRT), double-cantilever-beam (DCB) experiment, intergranular corrosion (IGC) and EC experiments. The results show that the 1933 aluminum alloy forging under T6(120 ℃, 24 h) aging treatment reveals the strongest stress corrosion cracking sensitivity and the critical stress intensity factor KISCC?is only 8.95 MPa·m1/2. After aging treatment at (110 ℃, 6 h)+(160 ℃, 8 h) and (110 ℃, 12 H)+(170 ℃, 8 h), KISCC?is elevated to 23.84 and 27.56 MPa·m1/2, respectively, which indicates higher stress corrosion cracking resistance. Accompanying the improvement of stress corrosion resistance, the strength loss and plasticity loss decrease sharply when the forging is aging-treated at (110 ℃, 12 h)+(180 ℃, 6 h). The forging has excellent intergranular corrosion resistance under all aging treatments and the forms of corrosion are all pit corrosion. Meanwhile, the exfoliation corrosion resistance of the forging is also very good. The level of exfoliation corrosion is EC when the forging is under T6 aging treatment. After duplex aging, the level of exfoliation corrosion for the forging is EA+.
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