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A6N01鋁合金焊接接頭的微觀組織與力學性能
發(fā)布人：上海艾荔艾金屬材料有限公司bt990.com.cn
更新時間：2015-10-22
對高速列車車體用新型A6N01鋁合金進行MIG焊接，使用光學金相(OM)、掃描電鏡(SEM)、透射電鏡(TEM)、顯微硬度計和拉伸試驗機對焊接接頭的顯微組織與力學性能進行觀察與分析。
A6N01鋁合金焊接接頭的微觀組織與力學性能Microstructures and mechanical properties of A6N01 aluminum alloy welding joint
對高速列車車體用新型A6N01鋁合金進行MIG焊接，使用光學金相(OM)、掃描電鏡(SEM)、透射電鏡(TEM)、顯微硬度計和拉伸試驗機對焊接接頭的顯微組織與力學性能進行觀察與分析。結果表明：焊縫金屬為等軸晶狀的鑄態(tài)組織，焊縫邊緣的熔合區(qū)形成柱狀晶組織。在熱影響區(qū)(HAZ)，過時效區(qū)的晶粒比淬火區(qū)的更為粗大，形成HAZ軟化區(qū)。A6N01鋁合金母材析出短棒狀β′(Mg2Si)過渡強化相。HAZ析出粗大的短棒狀穩(wěn)定強化相β(Mg2Si)。焊縫顯微硬度最低，約為65 HV。焊接接頭的抗拉強度為270 MPa，斷后伸長率為6.0%。
The new type A6N01 aluminum alloy used in the high-speed vehicles was welded by MIG welding. The microstructures and mechanical properties of the welding joints were observed and analyzed by OM, SEM, TEM, microhardness and tensile testers. The results show that equiaxial as-cast microstructures exist in the welding metal. The columnar grains are formed in the fusion zone next to the welding seam. In the heat-affected zone (HAZ), the grains of over-aging zone are coarser than those of quenching zone. The softening region exists in the over aging zone of HAZ. The β′(Mg2Si) transitional strengthening phases precipitate in A6N01 aluminum alloy base metal. The β′ phase presents claval shape. The β(Mg2Si) stable strengthening phases precipitate in HAZ, which present coarse claval shape. The microhardness of welding seam is the lowest in the joint, which is about 65 HV. The tensile strength of the joint is ???270 MPa, and the elongation after fracture is 6.0%.
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